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Gear cutters

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John Olsen23/08/2010 08:12:26
1294 forum posts
108 photos
1 articles
The diameter is supposed to be a close approximation to the ideal involute curve, so I suppose in theory there would only be one "best fit" diameter. I suspect that for a lot of applications it is not all that critical, eg if the gears are not all that heavily loaded. After all, ordinary gearcutters only have 8 or so to a set at most, and each of those is actually only right for one size of gear.
 
You could use a diamond *  to adjust the size of a small mounted point to the desired diameter if you wanted to get close to a particular size that was not otherwise easily available.
 
I can still remember dropping a nice little home made cutter just after hardening and before tempering. 
 
*An industrial one, not the one you gave your wife all those years back... (if you have a wife that is...)
 
regards
John
John Stevenson23/08/2010 08:47:53
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5068 forum posts
3 photos
An alternative is to use a boring head and dial in the correct diameter.
This will also cover for the larger pitches and hight count teeth that need large diameter cutters.
 
John S.
Anthony Ashgrove23/08/2010 21:16:26
9 forum posts
Hi all,
I have not actually cut any gears yet ! ! But have studied Ivan Law's book and together with info found on the web written an exel spreadsheet to calculate the 'button sizes' and infeed to make form cutters for ANY DP and ANY PA. It calculates the data for each gear so you need to 'average' the cutter for the range of teeth youn require. If anyone wants a copy please e-mail me [email protected].
Hope this might clear up some confusion with the way it is presented in the book.
Tony Ashgrove
wheeltapper23/08/2010 21:25:43
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424 forum posts
98 photos
the main reason I tried this in the first place was because making a cutter with buttons hammered my poor little lathe to death and I thought there has to be a gentler way.
 
Roy
Michael Cox 113/09/2010 18:18:18
555 forum posts
27 photos
I have made a small modification to John Stevensons method of making gear cutters that puts some top rake on the cutting tool. This greatly reduces the cutting forces when machining gears. A full description is here:
Mike
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