> -----Original Message-----
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: May-22-20 6:01 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] CNC Helical Gear Cutting -- was RE: Face Milling
>
> On Sat, 23 May 2020 at 01:38, John Dammeyer <jo...@autoartisans.com> 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
Thanks Andy,
I'm studying what you provided in the zip file: (Going to have to find the
G-Code reference for some of this).
; [#1]feed [#2]distance [#3]cut [#4]finish [#5]end
o <hobbing> sub
#10 = #<_x>
#12 = #<_z>
#30 = FUP[[#12 - #5 - #4] / #3]
#3 = [[#12 - #5 - #4] / #30]
(debug, #30 cuts of #3)
#20 = [#12 - #3]
G95 F#1
o100 while [#20 GE [#5]]
G1 Z#20
G1 X[#10 + #2]
G0 Z[#20 + #3]
G0 X #10
G0 Z[#20 + #3]
#20 = [#20 - #3]
o100 endwhile
G1 Z#5
G1 X[#10 + #2]
G0 Z#12
G0 X#10
M2
o <hobbing> endsub
M2
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