Machine Screw Actuator (Imperial)
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Duff-Norton offers a complete line of both standard and custom engineered machine screw actuators for applications up to 350 tons.
Machine screw actuators offer positive mechanical action, precise positioning, and uniform lifting speeds. Standard configurations include upright or inverted units with translating or rotating lifting screws, and top plate, threaded, or clevis ends.
- Precise Positioning - can be controlled accurately for positioning within thousandths of one inch
- Self Locking - models featuring higher gear ratios are inherently load holding as long as the actuator is not subject to vibration
- Uniform Lifting Speeds - since many actuators feature the same gear ratios different capacities can be used in the same application to lift unevenly distributed loads with uniform speeds
- Quick, Sure Operation - All actuators are designed and built to be positive acting, for accurate response to motive power
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Machine Screw Actuator Performance Specifications (Imperial)
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Performance Table Instructions
When reviewing any Duff-Norton Actuator Performance Specifications Table, as part
of the process of selecting the best-suited actuator for your application, there
are several important worm-gear ratios to consider.
Standard Ratio - is frequently chosen when higher speeds and efficiency
ratings are desired.
Optional Ratio(s) - is frequently chosen when the application requires
higher lifting capacities, lower speeds, or to ease the use of a handwheel.
Numeric Ratio - is frequently chosen for applications requiring
fine adjustments, higher lifting capacities, lower speeds, the easy use of a handwheel,
self locking applications, and also offers the benefit of an even number of worm
input turns per inch of stroke. |
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Capacity (Tons)
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1/4
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1/2
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1
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2
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3
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5
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10
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15
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Max. Speed Cface Driven (in/min)**
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-
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-
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-
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72.0
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72.0
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108.0
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108.0
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108.0
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Max. Speed Red. Driven (in/min)**
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-
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-
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-
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14.4
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21.9
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21.9
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21.9
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21.9
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Dimensional Information Shown
on Page(s):
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18
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19
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20
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21-23
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24
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25
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26
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27
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Lifting Screw
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Diameter (in)
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1/2
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5/8
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3/4
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1
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1
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1 1/2
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2
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2 1/4
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Pitch (Std.&Opt.)
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0.250
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0.125
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0.200
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0.250
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0.250
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0.375
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0.500
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0.500
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Pitch (Numeric)
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-
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-
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-
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-
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-
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0.250
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0.250
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0.250
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Type
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ACME
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ACME
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ACME
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ACME
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ACME
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ACME
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ACME
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ACME
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Worm Gear Ratios
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Std.
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5:1
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5:1
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5:1
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6:1
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6:1
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6:1
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8:1
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8:1
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Optional No. 1
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-
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-
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20:1
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24:1
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24:1
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24:1
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24:1
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24:1
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Optional No. 2
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-
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-
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-
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12:1
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12:1
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12:1
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-
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-
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Numeric Ratio
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-
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-
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20:1
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25:1
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25:1
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25:1
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25:1
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25:1
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Turns of Worm for 1" Stroke
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Std.
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20
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40
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25
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24
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24
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16
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16
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16
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Optional No. 1
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-
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-
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100
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96
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96
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64
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48
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48
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Optional No. 2
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-
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-
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-
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48
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48
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32
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-
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-
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Numeric Ratio
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-
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-
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100
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100
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100
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100
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100
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100
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Worm Torque at No Load (in-lb)
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Std.
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2
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2
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5
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5
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5
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10
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20
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20
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Optional No. 1
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-
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-
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5
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5
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5
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10
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20
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20
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Optional No. 2
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-
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-
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-
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5
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5
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10
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-
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-
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Numeric Ratio
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-
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-
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5
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5
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5
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10
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20
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20
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Maximum Horsepower per Actuator
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Std.
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1/3
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1/3
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1/2
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2
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2
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4
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5
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5
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Optional No. 1
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-
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-
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1/4
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1/2
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3/4
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3/4
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1 1/2
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1 1/2
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Optional No. 2
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-
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-
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-
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3/4
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1 1/4
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2
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-
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-
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Numeric Ratio
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-
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-
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1/4
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1/2
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1/2
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3/4
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1 1/2
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1 1/2
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Worm Torque at Full Load* (in-lb)
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Std.
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13
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21
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55
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120
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165
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450
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750
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1430
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Optional No. 1
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-
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-
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25
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50
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75
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185
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400
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820
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Optional No. 2
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-
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-
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-
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75
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105
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275
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-
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-
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Numeric Ratio
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-
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-
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25
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48
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72
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175
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370
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640
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Efficiency Rating (%)
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Std.
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30.6
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18.9
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23.1
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22.1
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24.2
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22.1
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26.5
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20.9
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Optional No. 1
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-
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-
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12.7
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13.3
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13.3
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13.4
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16.6
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12.1
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Optional No. 2
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-
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-
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-
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17.7
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19.0
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18.1
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-
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-
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Numeric Ratio
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-
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-
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12.7
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13.3
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13.2
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9.1
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8.6
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7.5
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Key Torque (in-lb)
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Std & Opt. 1 & 2
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40
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70
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175
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460
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670
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1750
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4700
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7580
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Numeric Ratio
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-
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-
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175
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460
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670
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1599
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4077
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6645
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Max Worm Speed at Full Load (rpm)
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Std.
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1616
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1000
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573
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1051
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766
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560
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420
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220
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Optional No. 1
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-
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-
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630
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630
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631
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278
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236
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115
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Optional No. 2
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-
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-
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-
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630
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751
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458
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-
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-
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Numeric Ratio
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-
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-
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630
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657
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437
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270
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256
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148
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Max Load at Full Horsepower and
1750 rpm (lb)
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Std.
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455
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527
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520
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2332
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2521
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3047
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4386
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3406
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Optional No. 1
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-
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-
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400
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1156
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1888
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1064
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1791
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1276
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Optional No. 2
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-
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-
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-
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1258
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2402
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2339
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-
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-
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Numeric Ratio
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-
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-
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400
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1210
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1162
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1031
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1944
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1646
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Weight with 6" Stroke (Raise)
(lb)
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2.3
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2.3
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5
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17
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17
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35
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52
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66
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Weight per Additional 1'' Stroke
(Raise) (lb)
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0.1
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0.1
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0.3
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0.3
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0.3
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0.9
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1.4
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1.5
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*For loads from 25% to 100% of the actuator capacity, torque
requirements are approximately proportional to the load.
**Speed is a function of how the actuator is driven. Please see the ¿Motorized Performance"
verticle tab to your screen's left.
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All actuator models can be supplied with standard raises
up to 24 inches. Special raises up to 20 feet are available upon request. Standard
inverted keyed models do not have a cover pipe (except for the 1-ton and 75-ton
models). Closed heights dimensions may increase for actuators supplied with bellows
boots. |
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Capacity (Tons)
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20
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25
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35
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50
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75
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100
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150
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250
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Max. Speed Cface Driven (in/min)**
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108.0
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107.5
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107.5
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-
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-
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-
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-
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-
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Max. Speed Red. Driven (in/min)**
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21.9
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22.2
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22.4
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12.2
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-
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-
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-
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-
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Dimensional Information Shown
on Page(s):
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28
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29
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30
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31-32
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33
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34
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35
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36
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Lifting Screw
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Diameter (in)
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2 1/2
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3
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3 3/4
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4 1/2
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5
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6
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7
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9
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Pitch (Std.&Opt.)
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0.500
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0.666
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0.666
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0.666
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0.666
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0.750
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1.000
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1.000
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Pitch (Numeric)
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0.250
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0.320
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-
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-
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-
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-
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-
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-
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Type
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ACME
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ACME
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ACME
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Mod. Sq.
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Mod. Sq.
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Mod. Sq.
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Mod. Sq.
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Mod. Sq.
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Worm Gear Ratios
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Std.
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8:1
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10 2/3:1
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10 2/3:1
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10 2/3:1
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10 2/3:1
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12:1
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12:1
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50:1
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Optional No. 1
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24:1
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32:1
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32:1
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32:1
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32:1
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36:1
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36:1
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-
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Numeric
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25:1
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25:1
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-
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-
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-
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-
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-
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-
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Turns of Worm for 1" Stroke
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Std.
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16
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16
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16
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16
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16
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16
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12
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50
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Optional No. 1
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48
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48
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48
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48
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48
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48
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36
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-
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Numeric
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100
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100
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-
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-
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-
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-
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-
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-
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Worm Torque at No Load (in-lb)
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Std.
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30
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40
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50
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100
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150
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200
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250
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200
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Optional No. 1
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30
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40
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50
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100
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150
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200
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250
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-
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Numeric
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30
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40
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-
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-
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-
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-
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-
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-
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Maximum Horsepower per Actuator
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Std.
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5
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8
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8
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15
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15
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25
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25
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35
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Optional No. 1
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1 1/2
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2 1/2
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2 1/2
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6
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6
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11
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11
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-
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Numeric
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1 1/2
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2 1/2
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-
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-
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-
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-
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-
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-
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Worm Torque at Full Load* (in-lb)
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Std.
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1811
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2220
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4000
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7500
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12000
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16000
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28110
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20000
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Optional No. 1
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1035
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1401
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2400
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4200
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6601
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8600
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15500
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-
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Numeric
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925
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1500
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-
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-
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-
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-
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-
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-
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Efficiency Rating (%)
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Std.
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22.0
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22.4
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17.4
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13.3
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12.4
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12.4
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14.2
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8.0
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Optional No. 1
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12.8
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11.8
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9.7
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7.9
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7.5
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7.7
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8.6
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-
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Numeric
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6.9
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5.3
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-
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-
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-
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-
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-
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-
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Key Torque (in-lb)
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Std & Opt.
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10625
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14000
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26500
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47110
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73000
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118200
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216000
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423300
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Numeric Ratio
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9369
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11474
|
-
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-
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-
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-
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-
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-
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Max Worm Speed at Full Load (rpm)
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Std.
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174
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227
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126
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126
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79
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98
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56
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110
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Optional No. 1
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91
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112
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66
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90
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57
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81
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45
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-
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Numeric
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102
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105
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-
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-
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-
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-
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-
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-
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Max Load at Full Horsepower and
1750 rpm (lb)
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Std.
|
3370
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5691
|
4220
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5949
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4939
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8865
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7003
|
26780
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Optional No. 1
|
956
|
1839
|
1193
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2831
|
1537
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4670
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2875
|
-
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Numeric
|
1074
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1714
|
-
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-
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-
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-
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-
|
-
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Weight with 6" Stroke (Raise)
(lb)
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93
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160
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240
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410
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650
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1200
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1350
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2700
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Weight per Additional 1'' Stroke
(Raise) (lb)
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2.6
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2.5
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3.7
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5.5
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6.5
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9.0
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12.6
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23.0
|
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