Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: kolias on February 02, 2014, 02:19:35 PM
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For my 1st cut in MDF I made a 16”x16” square with an inscribed circle, hexagon and a triangle. I made a gcode for each one of these shapes and started to cut the square. Before the cut I used the auto zero button and now the DRO’s read x=0, y=o, z=+1.0000
The square cut was completed and the machine returned to origin ready for the next cut. The DRO’s now read x=0, y-0, Z=-0.0000.
Since I started cutting the square and the Z was at +1.0000 I was not sure if I should continue to cut or auto zero the Z again and decide to auto zero for all the remaining cuts (circle, hexagon and triangle.
Should I have continue the cuts without auto zeroing each time before the next cuts or it was good to auto zero the Z again before the next cut?
I attach the circle gcode and the script for the auto zero
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Perhaps my question is silly but when it comes to Z axis settings I would rather be safe than sorry.
I’m not an expert reading gcode or scripts and my question is when I finish my first cut and the DRO’s read x=0, y=0, z=0, is it safe to restart my next cut or the z will plunge through my table?
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Nicolas,
Only you can determine what is best for you, but with experience you will be able to improve your cnc operations. I trust my system and often make multiple pieces without re-zeroing. If a piece finishes with no problems, I know I have not lost positioning.
Pushing feed rates to the absolute maximum is often a way to assure problems. I try to set my axis velocity and acceleration values at about 75% of where my steppers stall during setup tuning. YMMV.
Best Regards,
John Champlain
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Your script tells the Z to go to +1 when you auto zero, and your g-code tell the Z to go to 0.00 when it finishes. As long as you don't need a different Z zero, then you should be OK.
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Thanks Gerry, I was not sure before but now I am