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Machine Screw Actuators (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.
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Precise Positioning - can be controlled accurately for positioning
within thousandths of one inch
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Self Locking – models featuring higher gear ratios are inherently
load holding as long as the actuator is not subject to vibration
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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
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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) |
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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