Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: amstanley on April 25, 2018, 09:05:00 PM
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Hi guys, bit of an unusual one here...
I am using Deskproto as a g-code generator,
on an x-carve modified with an A-axis.
running G-code for a tutorial you can find here: https://www.deskproto.com/gallery/venus.php
On the clearing pass I am using a milling strategy called 'helix' where the g-code essentially runs from one end of the workpiece to the other in a long single pass.
sort of like Meg Ryan peeling the apple in Sleepless in Seattle, in one long cut of the knife...
On a test run I noted that the A axis accumulated a very significant value, on the order to -500k, after about 50% of the g-code lines.
It made me wonder how I will be able to set the axis to zero when the run is finished,
without having to 'rewind' all those turns, which is what would happen if I simply issue a command for 'g0 a0'
anybody have any advice on how to return to zero easily when the A axis value is significant?
Thanks in advance for any help...
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Some Gcode you could try...
G1 A *********x (where *********x is a multiple of 360 and a number close to the existing A axis DRO reading)
#99803=0
%
This should rotate the A axis to a multiple of the zero position with minimum rotation then reset the A axis DRO to zero.
You could then goto zero on the other axes in the usual way.
Tweakie.
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Possibly rework your code to work in incremental rather than absolute coordinates g91/g90
HTH
RT
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Yes it would be nice to know how to do this as it would allow threading on my fourth axis which is stepper driven. The threading ‘tool’ could be a lathe tool or the mill spindle with a shaped cutter.
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Add the following M1010.M1S file to the the C:/Mach3/macros/ Mach3Mill
folder ( the folder represents the profile you are using).
When you input M1010 in the MDI line it will zero the X,Y,Z A axes and also set the work
offsets to zero. Place a comment mark in front of any line in the M code which you do want
to use ie; ' SetMachZero ( 0 ) or ' Code "G92.1" .
Change the G10 command to G10 l2 P1 A0 if you only want to reset the A axis work offset.
RICH