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Gear Inspection Chart Evaluation; Specifying Unusual Worm Gear Sets - November/December 1991

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Archive > 1991 > November/December 1991 > Gear Inspection Chart Evaluation; Specifying Unusual Worm Gear Sets

The article "Gear Inspection Chart Evaluation; Specifying Unusual Worm Gear Sets" appeared in the November/December 1991 issue of Gear Technology.

Summary
Question: When evaluating charts from a gear inspection machine, it is sometimes found that the full length of the profile traces vary, and that sometimes they are less than the length of active profile (above start of active profile-SAP) by up to 20%. This condition could be caused by a concentricity error between tooth grinding and shaping, or by unequal stock removal when grinding. (See Fig. 1.) Is it possible that some of the variation is coming from the inspection machine? How can variation from the inspection machine be reduced?

Keywords
gear inspection, chart interpretation, undercut, worm gears, dual lead worms, double-enveloping worm gears, hourglass, basics, shop floor

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