GearHeads Forum

This is about my code on the Mach3 help forum:

https://www.machsupport.com/forum/index.php?topic=45287.msg288673#msg288673

It has a couple of photos of finished knurls.

There's loads of stuff on the web about lathe knurling, as well as the knurling "rolls" it needs a very rigid lathe to make a ...

Apologies, I should have referred to A axis - i.e. ROTARY axis - backlash in my question!!

People usually knurl on a lathe with knurling wheels. If you have a rotary axis though very nice knurls can be engraved. I've written a little Python wizard to do this (happy to share) but since knurling is related to making helical gears it could be a nice future feature perhaps?

My wizard is ...

I'm contemplating making some gears for a clock and one option would be to make the pinions using my rotary axis. This is a Myford type dividing head with a stepper motor attached which works very well but does have some backlash, so it is best to drive it in a way that only needs rotation in one ...

Thanks Art, that's useful to know - and hopeful!  I can sort of picture how a pinion could be cut, using a 4th axis and a small endmill to gash then shave the teeth.  The article described experimental gears where the pinion was planed on a lathe driven through the leadscrew but the tooth ...

I have just been reading in a horological publication about the use of this configuration in a series of 19th century clocks.  Essentially it describes a wheel / pinion configuration using helical teeth, where the pinion had a veryu low tooth count, usually 1!  The advantage claimed is ...

Art, just to raise another question about this.  I've got interested in just how well these approximate cycloidal gears actually perform (or don't) and how they might be optimised whilst staying with the circular approximations.  The result could be that for a given pair of gears the ...

You can see the gravity arm in the clock here:
https://groups.io/g/synchronome1/photo/86249/13?p=Created,,,20,2,0,0

I don't have a photo of the final cam but here's a picture of the profile from Excel.

It spirals both ways - but easy to modify the code to only do one way (which was how my ...

Many thanks, Art.

More conventionally, hobs have the teeth on helical profiles, rather like a tap, and the gear blank rotates at the same time as the hob, with a ratio between the speeds so that the blank moves through one tooth angle per rev of the hob.  The hob is fed slowly back so that all the teeth are ...