Opps.  Yes I meant an involute hob is a simple trapezoid.  No curves;)
Cycloidal hob is indeed a funnier shaped thing and far more difficult to
make.

On Tue, Dec 8, 2015 at 5:14 PM, Dave Caroline <dave.thearchiv...@gmail.com>
wrote:

> Hobs can be ground to generate cycloidal teeth as well as involute,
> the key word here is "generate" which is the process of making the
> required curve.
>
> Dave Caroline
>
>
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