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bevel gear

where to start the tooth cut

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Tony Jones 626/11/2014 10:19:04
3 forum posts

Hi,

I am attempting to cut some bevel gears on a vertical mill, and would like to know the best dia to start the tooth cut , the small or the large.

Thanks.

Neil Wyatt26/11/2014 21:48:35
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19226 forum posts
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86 articles

Hi Tony,

I assume you are cutting constant depth bevels. In practice it's not critical, but if you can arrange it so that all the cuts start from the small end of the gear (and have this facing outwards for visibility, if mounted on a stub mandrel in a chuck).

This is because all three (or both if you are brave) cuts pass through the same point at the small end and it should be easy to judge if the cutter is too high or low when you do the 'blank rol'l and reset the cutter, simply by offering the stationary cutter up to the small end.

Neil

Tony Jones 627/11/2014 09:11:17
3 forum posts

Thanks Neil,

To be honest Im struggling a bit ! I am making a differencial for a buggy and have never cut bevel gears before, and the maths for the teeth and cutter size is new to me.

Thanks for your help,

Tony

Neil Wyatt27/11/2014 10:57:57
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19226 forum posts
749 photos
86 articles

Hi Tony,

Put up the basic details, adn I'll see if I can help.

Neil

Tony Jones 627/11/2014 11:19:57
3 forum posts

Hi Neil,

they need to be 45 deg with a pitch dia at the small end of 1.000 I thought 20 teeth would be ok and have a 26-35 cutter, I am using a vertical mill and a dividing head.

Thanks.

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