Variable 3-disc indicating gage VD

Circumferential backlash measuring instrument for external gearing
AVD

Circumferential backlash measuring instruments (variable 3-disc indicating gauges) IVD / AVD measure the actual circumferential backlash in relation to the tolerance limit max. effective / min. effective. Circumferential backlash measuring instruments are therefore fully toothed. The instrument is adjusted by means of a setting plug or a setting ring. There is no standard method of inspecting the circumferential backlash – it is specified in standards ANSI B92.1 and ISO 4156 as a special inspection method.

Composite no go gauges are the basis for circumferential backlash. They are listed in these two standards as special inspection methods „Alternate A“ and „Alternate B“. Circumferential backlash measuring instruments can be used instead of composite no go gauges.

Circumferential backlash measuring instrument for internal gearing
IVD

AVD with master