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Bernd:

--- Quote from: Darren on March 19, 2009, 08:36:40 PM ---In that case Bernd, what's a "roll angle" when talking about gears?


--- End quote ---

Could you point me to the place you read that. There may be a difference in meaning.

Bernd

Darren:
Sorry Bernd,

It's from something I read many years ago in some publication. It was something to do with the shapes of gear teeth to allow them to roll against each other and lessen the sliding action.
I seem to remember this was critical in transmission gears to reduce wear, noise and heat. It also smoothed the torque delivery and reduce pulsating power transmission as the gear teeth changed angles.

I could be barking up the wrong tree of course, I was hoping you may be able to enlighten somewhat.

Bernd:
Darren,

I'll try to find out. It's been a long time since I was involved with cutting gears. The other thing I wish I hadn't done now is throw away all the info I had stored up on gear theory.

BTW the company I worked for had a subsidiary in England called Gleason Limited. I don't remember exactly were they are located. A google search on Gleason Works would probably get you there.

Bernd

Found the address of the company in England:

Gleason Cutting Tools Limited
Plymbridge Rd.,Estover
Plymouth PL 6 7LQ, England

Darren:

Bit more reading up on this and it seems they do both, roll and slide. But it only applies to involute gears. ie most gears today.

http://en.wikipedia.org/wiki/File:Involute_wheel.gif

Involute gears are designed to minimise sliding by adding a rolling action.

Bernd:
So Darren, does that let me off the hook?  :D

Bernd

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