Re: Whole Depth & Minor Diameter

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Posted by Bill S. on October 19, 2000 at 00:17:32:

In Reply to: Whole Depth & Minor Diameter posted by Zachary Young on October 17, 2000 at 10:42:53:

I agree with you that whole depth is for reference only, but I don't know of a standard to back that up.

As you know, whole depth is the result of the cutter's depth of cut required to get a correct over-pin measurement, and the turned OD of the blank. Whole depth as specified on each hob is a calculated number based on the hob's width of topland.

Standard hob tooling is ground to a standard topland width and thus is supposed to produce standard whole depth on a standard OD blank cut to a standard pitch diameter. Prints usually show standard whole depth, based on the designer's choice of gear system, which is equal to a number (such as 2.1571) divided by NDP.

I think if your customer considers the manufacturing build up of OD and pitch diameter tolerances (based on over pin tolerances), the +/-.002 they suggest might be impossible to control without custom tooling. It's unlikely the designer had custom tooling in mind.

This is a good question, and I hope someone can provide a perspective based on AGMA standards.

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