scope:

This Standard relates to Standard precision Servocomponent Gearjeads, hereinafter referred to as gearheads. It is not complete in itself but shall be read in conjunction with Def stan 61-14 (part 1), "precision instrument, rotating servocomponents, part 1: General requirements and common tests", hereinafter referred to as Def Stan 61-14(part 1), in which latter shall be regarded as forming as forming an inherent part of this document.

The standard gives information on or states the requirements for those attributes which are relevant to gearheads:

- Definitions, terms and conventions

- Type designation and marking

- Test requirement and methods of test

- Nature of test equipment

Physical and performance requirements for individual types of standard gearheads are given in the relevent Supplementary Detail Sheets.

NOTE: performance figure and their limits stated in the relevant supplement Detail sheet are based on a close-tolerance power supply and on test conditions which are strictly controlled. Under service conditions, these figure may be modified by the effects of power supply variations and of environmental conditions.