Frequently Asked Questions

Shaft tolerances will depend on the type of load and shock load of the application.  Shaft tolerance recommendations are included in the Appendix of our catalog.

A torque arm assembly is offered as an option.  The standard torque arm assembly and standard mounting positions are shown in the Appendix of our catalog.

The Hyponic^® is standardly supplied as a shaft mount with a keyed hollow bore.  Options are available for a solid shaft with feet and a flange mounting configuration.  Since the Hyponic^® is grease lubricated as standard, it can be mounted in any position 
without modifications.

The Hyponic^® speed reducer, by virtue of its smooth, almost frictionless operation (unlike traditional helical gears), has a thermal rating that far exceeds its mechanical capacity and all but eliminates the conventional limitations due to heat.

In general terms, the speeds are 1750 and 1450 RPM.  The selection tables in our catalog are based on 1750 RPM.  The reducer selection tables show ratings at 1750 RPM for Quill models, and 1750 and 1450 for C-face models.

Hyponic^® speed reducers provide 250% momentary intermittent shock load capacity.  For applications with shock loads greater than 250%, consult a Sumitomo Application Engineer.

The standard ratings for Hyponic^® are based on 10-hour daily service under conditions of uniform loads (equivalent to AGMA service factor 1.0).  By following the product selection process outlined in our catalog, you will determine and apply the Service Factors to compensate for severe operating conditions.

In general, reducers and gearmotors are rated for specific conditions and operating requirements of the application by the use of AGMA-defined Service Factors.  There are three AGMA load classifications for reducers: uniform (U), moderate shock (M) and heavy shock (H), and three AGMA load classifications for gearmotors: I, II, and III. Refer to our catalog for a list of AGMA load classifications. These Service Factors are used in the product selection process to adjust for the specific conditions and operating requirements of your application.

To select the proper reducer for your application, you will need to know:Application: type of driven machine
Hours of operation per day
Motor horsepower (HP) and speed (RPM)
Loading Conditions
Mounting Position 
Ambient environment (altitude, dusty, chemical, explosive, water) 
Ambient temperature and humidity 
You must also note any special environment factors or operation requirements. This information will ve important in determining your application's service factor.

Selection is based on the actual horsepower and/or torque requirements at the output shaft.  The Hyponic® speed reducer has particularly high efficiencies over a wide range of reduction ratios, which frequently permits the use of reduced input power requirements (smaller HP motor) without sacrificing output shaft torque.  The selection procedures in our catalog will guide you in choosing the most efficient reducer for your application.