More help please

[Michael GilliganParticipant @michaelgilligan61133]

Despite the [hopefully] interesting assertion that I to linked yesterday: One of the advantages of cycloidal gearing for clocks is that its tooth depth is non-critical … The wheel centre distances are optimised when the train is planted.

MichaelG.

[Anonymous]

The ISO standard for tooth depth on MOD gears is 2.25 times the module. So for 0.75Mod that gives 1.6875mm.

Call it 1.69mm.

Andrew

[JasonBModerator @jasonb]

That ties in with what HPC give for the larger gear sizes Andrew, is any mention made for smaller ones?

[Anonymous]

Small Mod value gears, or small numbers of teeth?

Andrew

[David NobleParticipant @davidnoble71990]

Brilliant. Thank you so much.

[JasonBModerator @jasonb]

Small MOD values, HPC give 2.4 times MOD for 0.25 – 1 MOD and 2.25 x MOD for 1.25 – 8 MOD

Not corrected PCD or OD for small numbers of teeth

[Anonymous]

Posted by JasonB on 11/01/2019 14:13:32:

Small MOD values, HPC give 2.4 times MOD for 0.25 – 1 MOD and 2.25 x MOD for 1.25 – 8 MOD

In that case no – I don't see why the total tooth depth equation should vary with MOD value? Surely different MOD values are simply scaled versions of one another.

Andrew

[Author]

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