EMEA - EN
Anti-backlash Screw Jacks
Screw Jacks
1/4-to-250-ton capacity. Anti-backlash actuators reduce vertical backlash resulting in smooth, precise operation and minimal wear.
Features & Benefits
Backlash occurs when the motor driving an actuator reverses its load direction. When the actuator is under load, the lifting screws threads are supported by the worm gears threads. The anti-backlash nut, pinned by the worm gear and 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.
- Capacity
1/4 to 250 Ton models. - Precise Positioning
Anti-backlash nuts help ensure more precise positioning and repeatability in linear motion systems - Dual Purpose
Also acts as an internal safety nut. - Ratios
Available with standard, optional, & numeric ratios. - Material Option
Available in stainless steel for most capacities. - Maximum Control
The ability to lock and hold a load, thereby eliminating the need for brake motors required for some applications.
Specifications
| Capacity Tons | 1/8 | 1/4 | 1/2 | 1 | 2 | 5 | 10 |
|---|---|---|---|---|---|---|---|
| Model Number | E250 | E500 | E1000 | E2000 | E4000 | E10000 | E20000 |
| Maximum Speed C-face Driven (in/min) | — | — | — | — | 72 | 108 | 108 |
| Maximum Speed Reducer Driven (in/min) | — | — | — | — | 14.1 | 21.9 | 21.9 |
| Lifting Screw - Diameter (in) | 1/2 | 1/2 | 5/8 | 3/4 | 1 | 1-1/2 | 2 |
| Lifting Screw - Pitch | 0.25 | 0.25 | 0.125 | 0.2 | 0.25 | 0.375 | 0.5 |
| Lifting Screw - Type | ACME | ACME | ACME | ACME | ACME | ACME | ACME |
| Worm Gear Rations | 5:1 | 5:1 | 5:1 | 5:1 | 6:1 | 6:1 | 8:1 |
| Turns of Worm for 1 inch Stroke | 20 | 20 | 40 | 25 | 24 | 16 | 16 |
| Worm Torque at No Load (in-lb) | 2 | 2 | 2 | 5 | 5 | 10 | 20 |
| Maximum Horsepower per Actuator | 1/3 | 1/3 | 1/3 | 1/2 | 2 | 4 | 5 |
| Worm Torque at Full Load* (in-lb) | 13 | 13 | 21 | 55 | 120 | 450 | 750 |
| Effeciency Rating (%) | 30.6 | 30.6 | 18.9 | 23.1 | 22.1 | 22.1 | 26.5 |
| Key Torque (in-lb) | 40 | 40 | 70 | 175 | 460 | 1750 | 4700 |
| Maximum Worm Speed at Full Load (Rpm) | 1616 | 1616 | 1000 | 573 | 1051 | 560 | 420 |
| Maximum Load at Full Horsepower ad 1750 Rpm (lb) | 455 | 455 | 527 | 520 | 2332 | 3047 | 4386 |
| Weight with 3 inch Stroke (lb) | 2 | 2 | 2 | 5 | 17 | 34 | 52 |
| Weight per Additional 1 inch Stroke (lb) | 0.1 | 0.1 | 0.1 | 0.3 | 0.3 | 0.9 | 1.4 |
