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22nd January 2022, 04:27 PM #1Intermediate Member
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Mach 3 - "Goto zero" moves Z negative and below zero
Helping a mate set up his CNC (neither of us have much experience setting up a machine!)
Most things appear to be working properly.
X, Y & Z all home in the correct direction etc.
After setting Z height to zero on top of work material, then pressing "goto zero" the Z axis plunges further down at least to -10 (at which point the machine started moving the X & Y axes toward zero)
Not sure what would cause the Z axis to move below zero.
Any help appreciated.
Cheers, David
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22nd January 2022 04:27 PM # ADSGoogle Adsense Advertisement
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23rd January 2022, 07:14 AM #2GOLD MEMBER
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Have you homed the machine before zeroing the axes?
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23rd January 2022, 04:18 PM #3Intermediate Member
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23rd January 2022, 07:20 PM #4SENIOR MEMBER
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What direction does Z move?
What does the DRO in Mach3 show after it has down to this Z move down?
Chances are you have it set up so that Z moving down is positive.
Z moving up towards the sky should be positive (value increasing)
Z moving down towards the ground should be negative.
Convention is to have Z all the way up as zero, and all the Z axis travel is negative (in machine coordinates).
Important to understand machine coordinates (G53) vs work coordinates (G54)
I suspect your GCode program has a line like
G0 Z10
Then
G0 X0 Y0
If you have Z set inverted, this will result in a plunge down 10mm then move to X0Y0
If you post the GCode we may be able to comment further.
Good idea to proof new g code by running it in air, well above workpiece.
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24th January 2022, 03:22 PM #5Senior Member
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Are you setting z height with a probe or manually?
There should be a probe thickness setting that might apply an offset automatically and make it think is a distance above the workpiece when it isn’t.
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25th January 2022, 09:15 AM #6Intermediate Member
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25th January 2022, 09:23 AM #7Intermediate Member
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Thanks, I'll check, but I think I had given up on the probe at this point (as the probe was giving unexpected results too).
FWIW, When the X, Y & Z are all manually set relating to a specific job, everything is OK. We have successfully cut out shapes several times.
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27th January 2022, 06:44 PM #8Senior Member
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Given a manual setting works ok it sounds like a toggle in the software is wrong.
I use a setting to change the zero reference between the material surface and the machine bed, depending on the job I want to do.
If I set the toggle to material surface and zero to the bed the behavior I get is as you describe.
Unfortunately I don't know Mach 3 at all and am no help about where to look for a similar setting.
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27th January 2022, 07:26 PM #9Intermediate Member
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Thanks Bone Inspector.
That sounds interesting.
What is the the software you're using and what is the name of the toggle?
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28th January 2022, 10:58 AM #10Senior Member
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Vectric and fusion.
but this is in the software that generates the g code.
I use UGS to stream code to my cnc and there is stuff there too for setting up offsets with my probe.
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