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Wheel cutting depth of feed

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Russell Eberhardt09/02/2012 13:53:32
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Can anyone explain why the depth of feed for modules 0 to 1.5 is given as 2.95 x M except for the range 0.5 to 1.0 where it is given as 3.38 x M?
 
This doesn't seem logical to me. I could understand a smaller module being different to a larger one but changing back again seems strange Or is there a misprint in the tables?
 
Russell.
Stub Mandrel09/02/2012 21:34:54
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My ageing Machinery's Handbook gives the total depth (i.e. cutter feed) as 2.157xmoduls or 2.167xmodule depending on whether clearance is 0.157xmodule or module/6 (the former being the American standard).
 
Whatever the source both of your figures seem way to high as the addendum =module and dedendum =module+clearance i.e. feed depth is module x 2 + clearance.
 
What is your source for these figures?
 
Neil
Russell Eberhardt10/02/2012 11:04:19
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Posted by Stub Mandrel on 09/02/2012 21:34:54:
My ageing Machinery's Handbook gives the total depth (i.e. cutter feed) as 2.157xmoduls or 2.167xmodule depending on whether clearance is 0.157xmodule or module/6 (the former being the American standard).
 
Whatever the source both of your figures seem way to high as the addendum =module and dedendum =module+clearance i.e. feed depth is module x 2 + clearance.
 
What is your source for these figures?
 
Neil
I think your figures are for involute gears as opposed to the cycloidal gears used in clocks.
 
The figures come from here: clock-works and the Meadows and Passemore catalogue.
 
Russell.
Niloch10/02/2012 12:16:12
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Does this post help at all?
Russell Eberhardt10/02/2012 19:06:39
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Not really. I cn cut the wheels OK. I was just looking for a technical explanation of the tables.
 
Russell.
Stub Mandrel10/02/2012 21:45:26
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Ah, I see. Ivan Law agrees with Machinerys, and as dfar as I can recall for cycloidal gears he says 'the depth is stamped on the cutter' or something like that. Is it possible that one depth is for gear to gear drives and the other for gear to lantern pinion?
 
Neil
Russell Eberhardt11/02/2012 21:02:46
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Found this useful site: Designing Cycloidal Gears . It gives all the equations based on the recommendations in BS 978. The BS calls for a bottom clearance of 0.4M and thus the ratio of tooth height (cutting depth) to modulus will be constant.
 
Working through the equations I get:
Depth = 3.06 x M
 
This is close enough to the factor of 2.95 given for the smaller and larger sizes. I can only assume that the cutters sold for M 0.5 to M 1 have a non standard form, perhaps to give greater bottom clearance for some reason. I can't see why though.
 
Russell;

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