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*
Unit Size (C.D.**)	Gear Ratio	Peak Torque (lb.ft.)*	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.