Posted by Sp on August 17, 2009 at 08:44:22:
In Reply to: Hob Tip Radius posted by Colin on August 17, 2009 at 07:51:25:
1. They use the specifications from standards, e.g. DIN 3972 or AGMA 201.02-1968
2. I disagree, some designs even show you the root dia. and form dia. Between those there's an extended involute and it is possible to calculate the hob radius out of it. Strength calcs take it into account. Some most advanced gear designs I've seen even show you the basic rack you should use on your tool to get good gear.
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