Re: [CAD_CAM_EDM_DRO] Gears : was Re: Usefull Utility

If you're talking about roller-chain sprockets, my understanding is that
the tooth forms are not involute, merely a radius, since, when the roller
seats itself, the only relative movement is radial, with respect to the
center of the roller. The action isn't the same as gear teeth which have
to mesh, front & back sides ot the tooth, without acceleration or
deceleration, and the tooth forms actually "sliding" across each other.
Therefore, you shouldn't need special cutters for different tooth
configurations... that is, if you're talking roller chain sprockets. Or
did I miss a post somewhere along the line??

Ray Heckert

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John S. wrote:

> As you say the pitch diameter doesn't change at a linear rate as the
> true shape is an involute. Just as the sprockets have 5 cutters per
> set gears have 8 per pitch and pressure angle.

> John S.

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