Wheel cutting depth of feed

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Wheel cutting depth of feed

This topic has 7 replies, 3 voices, and was last updated 11 February 2012 at 21:02 by Russell Eberhardt.

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9 February 2012 at 13:53 #84229
Russell Eberhardt
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@russelleberhardt48058
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.
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9 February 2012 at 13:53 #3633
Russell Eberhardt
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@russelleberhardt48058
9 February 2012 at 21:34 #84275
Sub Mandrel
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@submandrel
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
10 February 2012 at 11:04 #84290
Russell Eberhardt
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@russelleberhardt48058
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.
10 February 2012 at 12:16 #84296
Niloch
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@niloch
Does this post help at all?
10 February 2012 at 19:06 #84320
Russell Eberhardt
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@russelleberhardt48058
Not really. I cn cut the wheels OK. I was just looking for a technical explanation of the tables.

Russell.
10 February 2012 at 21:45 #84342
Sub Mandrel
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@submandrel
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
11 February 2012 at 21:02 #84468
Russell Eberhardt
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@russelleberhardt48058
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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