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Date Posted: 11:48:24 10/11/05 Tue
Author: L. D. Smith
Author Host/IP: 216.90.194.209
Subject: Typical Tolerances for the MOB for 8DP 40 Tooth Worm Gear

I am trying to reverse engineer a worm gear & I need to specify a MOB with tolerances. Our current gear description is:

.3927" AXIAL PITCH, LEFT HAND, 14 1/2° PRESSURE ANGLE, .7854" LEAD, 40 TEETH, 5" PITCH CIRCLE DIA., DOUBLE THREAD, DIAMETRAL PITCH = 8.
NOTE: USE SINGLE PITCH HOB NO. 680-5247.

(Note: Center distance on drawing is 3.068" +.005"/-.000 & throat radius is .450")

I have measured MOB on several gears with 7/32" balls & MOB only ranges from 5.372" to 5.378". This is a low speed/low accuracy gear, but I am concerned that a PD of say 5.375" +/-.003 is too tight for practical manufacturing.
I would greatly appreciate help from gear manufacturers, etc., or others that are much more knowlegeable than I.

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