High-Performance (HP) Servo-Worm Reducers

High-Performance (HP) 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 2 arc-minutes is provided standard, with lower backlash levels available as an option.

They are available in five sizes (50 mm to 125 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 1,650 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 2 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 keyway or a compression-type hub (see dimension pages).  We offer a line of accessories to adapt this output 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 HP 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) 4.75 405 47.9 51.6 51.6 51.6 47.9 45.0
6.75 295 41.3 46.5 50.9 50.9 47.9 45.0
9.25 200 35.4 39.8 42.8 51.6 51.6 47.9
14.50 260 42.0 47.9 51.6 55.3 55.3 55.3
19.50 180 33.2 36.9 40.6 47.9 47.9 47.9
29.00 220 35.4 40.6 44.3 51.6 51.6 47.9
39.00 150 39.1 44.3 47.9 55.3 55.3 55.3
50.00 110 31.0 34.7 36.9 44.3 44.3 44.3
4 (63 mm) 4.75 740 125 133 125 107 100  
6.75 550 125 133 125 107 100
9.25 370 85 96 100 100 100
14.50 440 122 133 133 125 118
19.50 370 85 96 100 122 114
29.00 480 129 151 162 144 137
39.00 330 103 118 129 140 140
52.00 220 70 85 92 111 118
5 (80 mm) 4.75 1,470 310 266 243 207  
6.75 1,030 310 266 243 207
9.25 810 273 266 243 207
14.50 960 332 310 273 218
19.50 740 273 295 280 236
29.00 890 384 391 361 310
39.00 630 317 361 354 229
52.00 440 177 203 221 243
6 (100 mm) 4.75 2,430 649 553 505 428  
6.75 1,700 612 531 487 428
9.25 1,400 612 531 487 428
14.50 1,510 686 598 531 457
19.50 1,330 664 598 531 457
29.00 1,700 848 745 627 590
39.00 1,220 797 738 664 575
52.00 810 561 627 579 502
7 (125 mm) 4.75 5,160 1,291 1,106 996 885**  
6.75 4,760 1,217 1,033 959 848**
9.25 3,250 1,180 996 885 775
14.50 4,310 1,328 1,291 1,106 959
19.50 2,880 1,291 1,106 1,033 885
29.00 4,200 1,623 1,438 1,328 1,143
39.00 2,800 1,549 1,365 1,254 1,106
52.00 1,840 1,328 1,180 1,106 959

*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.
**For Size 7, ratio 4.75:1, the maximum input speed is 2,200 rpm; for ratio 6.75:1, the maximum input speed is 2,800 rpm.
***C.D. = Center Distance of reducer, which is the vertical distance from the input shaft to the output shaft.