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Anti-Backlash Actuators (Imperial) |
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Anti-backlash actuators reduce vertical backlash resulting in smooth,
precise operation and minimal wear. Backlash occurs when the motor driving an
actuator reverses its load direction. Since there is a gap between the lifting
screw and the worm gear threads detrimental screw movement may occur. When the
actuator is under load, the lifting screws’ threads are supported by the worm
gears threads. The anti-backlash nut, being pinned by to the worm gear and
being adjusted downwards by the shell cap, forces the bottom thread surfaces
against the upper thread surfaces of the lifting screw. Thus backlash between
the lifting screw and worm gear threads is reduced to a minimum.
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The Duff Norton Anti-backlash design features a separate
anti-backlash nut and reduces actuator backlash to less than 1 thousandths
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Available in Stainless Steel
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Anti-backlash nuts reduce worm gear wear
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Anti-backlash nuts act as additional load safety devices when the
worm gear has become worn
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Please
select "Yes" at the Anti-Backlash prompt |
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Anti-Backlash 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) |
1/4 |
1/2 |
1 |
2 |
3 |
5 |
10 |
15 |
20 |
25 |
35 |
50 |
75 |
100 |
150 |
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Max. Speed Cface Driven (in/min)** (pg. 114) |
— |
— |
— |
72.0 |
72.0 |
108.0 |
108.0 |
108.0 |
108.0 |
107.5 |
107.5 |
— |
— |
— |
— |
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Max. Speed Red. Driven (in/min)** (pg. 106-107) |
— |
— |
— |
14.4 |
14.4 |
21.9 |
21.9 |
21.9 |
21.9 |
22.2 |
22.4 |
12.2 |
— |
— |
— |
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Lifting Screw |
Diameter (in) |
1/2 |
5/8 |
3/4 |
1 |
1 |
1 1/2 |
2 |
2 1/4 |
2 1/2 |
3 |
3 3/4 |
4 1/2 |
5 |
6 |
7 |
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Pitch (in) |
0.250 |
0.125 |
0.200 |
0.250 |
0.250 |
0.375 |
0.500 |
0.500 |
0.500 |
0.666 |
0.666 |
0.666 |
0.666 |
0.750 |
1.000 |
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Type |
ACME |
ACME |
ACME |
ACME |
ACME |
ACME |
ACME |
ACME |
ACME |
ACME |
ACME |
Mod. Sq. |
Mod. Sq. |
Mod. Sq. |
Mod. Sq. |
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Worm Gear Ratios |
Std. |
5:1 |
5:1 |
5:1 |
6:1 |
6:1 |
6:1 |
8:1 |
8:1 |
8:1 |
10 2/3:1 |
10 2/3:1 |
10 2/3:1 |
10 2/3:1 |
12:1 |
12:1 |
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Optional No. 1 |
— |
— |
20:1 |
24:1 |
24:1 |
24:1 |
24:1 |
24:1 |
24:1 |
32:1 |
32:1 |
32:1 |
36:1 |
36:1 |
36:1 |
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Optional No. 2 |
— |
— |
— |
12:1 |
12:1 |
12:1 |
— |
— |
— |
— |
— |
— |
— |
— |
— |
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Turns of Worm for 1" Stroke |
Std. |
20 |
40 |
25 |
24 |
24 |
16 |
16 |
16 |
16 |
16 |
16 |
16 |
16 |
16 |
12 |
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Optional No. 1 |
— |
— |
100 |
96 |
96 |
64 |
48 |
48 |
48 |
48 |
48 |
48 |
48 |
48 |
36 |
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Optional No. 2 |
— |
— |
— |
48 |
48 |
32 |
— |
— |
— |
— |
— |
— |
— |
— |
— |
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Worm Torque at No Load (in-lb) |
Std. |
2 |
2 |
5 |
5 |
5 |
10 |
20 |
20 |
30 |
40 |
50 |
100 |
150 |
200 |
250 |
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Optional No. 1 |
— |
— |
5 |
5 |
5 |
10 |
20 |
20 |
30 |
40 |
50 |
100 |
150 |
200 |
250 |
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Optional No. 2 |
— |
— |
— |
5 |
5 |
10 |
— |
— |
— |
— |
— |
— |
— |
— |
— |
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Maximum Horsepower per Actuator |
Std. |
1/3 |
1/3 |
1/2 |
2 |
2 |
4 |
5 |
5 |
5 |
8 |
8 |
15 |
15 |
25 |
25 |
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Optional No. 1 |
— |
— |
1/4 |
1/2 |
3/4 |
3/4 |
1 1/2 |
1 1/2 |
1 1/2 |
2 1/2 |
2 1/2 |
6 |
6 |
11 |
11 |
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Optional No. 2 |
— |
— |
— |
3/4 |
1 1/4 |
2 |
— |
— |
— |
— |
— |
— |
— |
— |
— |
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Worm Torque at Full Load (in-lb) |
Std. |
14 |
23 |
61 |
132 |
181 |
495 |
825 |
1573 |
2255 |
2970 |
4400 |
8250 |
13200 |
17600 |
30921 |
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Optional No. 1 |
— |
— |
28 |
55 |
82 |
204 |
440 |
902 |
1287 |
1870 |
2640 |
4620 |
7095 |
9460 |
17050 |
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Optional No. 2 |
— |
— |
— |
82 |
115 |
303 |
— |
— |
— |
— |
— |
— |
— |
— |
— |
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Efficiency Rating (%) |
Std. |
27.8 |
17.2 |
21.0 |
20.1 |
22.0 |
20.1 |
24.1 |
19.0 |
17.6 |
16.7 |
15.8 |
12.1 |
11.3 |
11.3 |
12.9 |
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Optional No. 1 |
— |
— |
11.6 |
12.1 |
12.1 |
12.2 |
15.1 |
11.0 |
10.3 |
8.9 |
8.8 |
7.2 |
7.0 |
7.0 |
7.8 |
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Optional No. 2 |
— |
— |
— |
16.1 |
17.2 |
16.4 |
— |
— |
— |
— |
— |
— |
— |
— |
— |
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Weight with 6" Stroke (Raise) (lb) |
2.3 |
2.3 |
5 |
17 |
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