Configuring A rotary axis to substitute for the Y axis

If using trivkins in the development version then the only
change you need to make is from...

You also need to make sure the number of joints is specified
correctly, example:

(Using kinstype=both is helpful in seeing what goes on
prior to homing for the axis gui)

Recommendations for consistency:
Ref: linuxcnc.org/docs/master/html/getting-st..._axes_specifications


trivkins man page:
linuxcnc.org/docs/devel/html/man/man9/trivkins.9.html

May try that if I am not happy with the code Vcarve pro generates for the cylindrical projects. On my config problem I punted and used the XYZA in stepconfig and just defined A to be on my normal Y driver and Y using pins not really connected to anything. Runs manually now. Naturally with a phantom Y I need to run without my limit/home switches and its has been a long time since I have run without so need to figure out how to past that now. First attempt was manually adding home_search_vel=0 to axis section and still got the “cant run MDI commen...” message.

Leon,
I figured out how to get Vcarvepro to output angular movements and and am running an XYZA with a nonexistent Y axis. It now works but the A axis seems to be turning at the same magnitude in degrees/min that the linear axis moves in inches/min. Obviously the rotation is pretty darned slow. Moving the right amount just getting there slowly. Is that just something that needs overcome in the G code or is there a linuxcnc end fix?

Andy,
I have Vcarve ouputing A moves now and the machine is moving the right amounts. But the feed for the A axis is the same in deg/min as the linear is in inches/min. Obviously kind of slow. Is there a linuxcnc fix for rotational moves or does that just have to be a G code fix?

In rotary files, the feed rates are up to 30000 mm/min when rotating without G1 commands.
So you need to add fast command's in your gcode file, like

Y5 Z68 A-220 F35000

I think what you are looking for is inverse time mode.

OttoDidact wrote:

I think what you are looking for is inverse time mode.

Yes. Inverse time or TCP would feed correctly

In mastercam you can set the machine definition to post this. So there should be a setting in the cam software

forum.vectric.com/viewtopic.php?f=38&t=30773