Rack & Pinion Systems

High-Torque (HT) Servo-Worm Reducers

High-Torque (HT) Servo-Worm Reducers

This standard range of Servo-Worm Reducers are perfect for use in applications that demand high performance, precise positioning and repeatability.  They were specifically developed for use with state-of-the-art servo motor technology, providing tight integration of the motor to the unit.  Angular backlash of less than 1 arc-minutes is provided standard.

They are available in four sizes (50 mm to 100 mm center distance) with input speeds up to 5,000 rpm, reduction ratios from 4.75 to 52:1 and output torque capacities up to 885 lb.ft.  A wide range of motor couplings and mounting flanges are available for assembly to virtually all servo motors, and the hollow bore output can be used to mount output shafts, pinion shafts, or other drive elements.

Typical applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives, zero-backlash axis drives and electronic line shafting.  Industries served include Material Handling, Automation, Aerospace, Machine Tool and Robotics.

  • Unit Design &
    Construction
  • Unit Selection
  • Unit Ratings

Gearing: Internal gear design was optimized to provide an angular backlash of less than 1 arc-minutes at assembly, with the option of “in the field” adjustable backlash if necessary.

Bearings:  Input angular contact bearings for high input speed, and robust output tapered-roller bearings for high radial and axial load capacity.

Housing:  Light weight aluminum housing for good heat dissipation, with integral input flange for servo motors and universal mounting on any face.

Output:  The output bore is available with a compression-type hub or a ISO 9409-1 flange (see dimension pages).  We offer a line of accessories to adapt these outputs to straight shafting, Rack & Pinions, or other gearing types.

These reducers are typically selected based on the peak cycle forces, which usually happen during accelerations and decelerations.  These cycle forces depend on the driven load, the speed vs. time profile for the cycle, and any other external forces acting on the axis.  For more selection information, please follow this PDF link.

For application & selection assistance, please call, fax or email us.  Your application information will be reviewed by our engineers, who will recommend the best solution for your application.

The following table gives the output torque ratings (in lb.ft.) for the High-Torque (HT) Servo-Worm Reducers at various input speeds and ratios.  Service factors need to be applied to these ratings to make a proper selection.

To see the unit dimensions of each size, click the "Unit Size" in the left column.

Unit Size
(C.D.**)
Gear Ratio Peak Torque
(lb.ft.)*
Output Torque (lb.ft.) based on Input Speed*
500 rpm 1,000 rpm 1,500 rpm 3,000 rpm 4,000 rpm 5,000 rpm
3 (50 mm) 4.75 608 72 77 77 77 72 68
6.75 443 62 70 76 76 72 68
9.25 300 53 60 64 77 77 72
14.50 390 63 72 77 83 83 83
19.50 270 50 55 60 72 72 72
29.00 330 53 61 66 77 77 72
39.00 225 59 66 72 83 83 83
50.00 165 47 52 55 66 66 66
4 (63 mm) 4.75 1110 188 200 188 161 150
6.75 825 188 200 188 161 150
9.25 555 128 144 150 150 150
14.50 660 183 200 200 188 177
19.50 555 128 144 150 183 171
29.00 720 194 227 243 216 206
39.00 495 155 177 194 210 210
52.00 330 105 128 138 167 177
5 (80 mm) 4.75 2,200 465 399 365 311  
6.75 1,550 465 399 365 311
9.25 1,215 410 399 365 311
14.50 1,440 498 465 410 327
19.50 1,110 410 443 420 354
29.00 1,335 576 587 542 465
39.00 945 476 542 531 344
52.00 660 266 305 332 365
6 (100 mm) 4.75 3,650 974 830 758 642  
6.75 2,550 918 797 731 428
9.25 2,100 918 797 731 642
14.50 2,265 1,029 897 797 686
19.50 1,995 996 897 797 686
29.00 2,550 1,272 1,118 941 885
39.00 1,830 1,196 1,107 996 863
52.00 1,215 842 941 869 753

*Ratings are based on servo operation and 12,000 hours running at rated torque.  For continuous operation, thermal limitations must be considered, please consult the factory.  Peak torque values are based on the ultimate strength of the gear teeth.  Information is subject to change without notice.
**C.D. = Center Distance of reducer, which is the vertical distance from the input shaft to the output shaft.