On Sat, 23 May 2020 at 01:38, John Dammeyer <[email protected]> wrote:

> So for LinuxCNC, if you have the A Axis and an encoder on the horizontal 
> spindle, how do you tell the system to hob the gear?

The A axis isn't just connected to axis.4.motor-pos-cmd. Instead it is
connected to the sum of the commanded position and the spindle revs /
teeth (a simple calculation done in HAL).

It is only connected to the A command at all so that I can jog it to
tweak the phase relationship if I ever need to re-cut a gear.

>  But ultimately what does the G-Code look like for hobbing that gear?

It's just a G1 Xnnn move to feed the gear through the hob. The hob
moves at spindle/teeth time all the time.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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