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What is the Roll Angle on an involute tooth?

What is the Roll Angle on an involute tooth?

What is the Roll Angle on an involute tooth?

(OP)
Okay, I know this is a really basic question, but it's been ages since I did any gear design, and I can't find a decent definition of it anywhere.  Can someone give me a good SIMPLE definition, or point me to a clear picture on a web site, or draw a basic picture in Paint and include a quick explanation???

Any help at all here will be greatly appreciated.

Thanks!!

RE: What is the Roll Angle on an involute tooth?

(OP)
Never mind, I found what I needed on an old drawing.

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