Thread: mach 3 scaling issue
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14-09-2016 #1
See pic for scaling location.
To test if moving correct distance use the MDI and command a move. Try this.
First Zero the axis you wish to move. In this case lets say X axis. Type these commands in order written below push enter after each.
G21
G90
G1 X54 F500
If it doesn't move correct distance then it can only be that your Steps per are not set correctly.
It's very easy to calculate the steps per. Take the micro step setting on the drive and divide by the pitch of the ballscrew. If uses ratio this will need be taken into account.
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14-09-2016 #2
Just completed the test.the tool pointer moved 56mm, so a little bit of adjustment needed.but this does not answer why the machine is cutting far to large.the fault must lay in the way mach 3 is reading the artcam software.could it be that the g code needs to be in a different format .....
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14-09-2016 #3
Terry the code is fine I loaded it into mach it cut air perfectly.
I wouldn't mess around just install mach again. Then try but first make sure the steps per setting is correct. This figure isn't just some randon number or one that can be close. It must be exact or the machine will never move correct distance.
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14-09-2016 #4
There is one thing you could try but I don't think it will be the problem but hurts nothing to try.
The code uses IJ mode for the arc moves so could try changing the IJ Mode setting in general config. However usually when the IJ mode is wrong you'll get large circles on the screen.
Go to General Config change the IJ Mode to opposite of what it's set to now. See pic where to find.
Last edited by JAZZCNC; 14-09-2016 at 10:58 PM.
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14-09-2016 #5
I was looking at Terry1956's machine earlier this week. It's a Sieg X1 and appears to have 3mm pitch trapezoidal leadscrews. Drivers are set to 1600 microsteps/rev, and Mach3 was configured with 533.333 steps/per. System set to mm, of course. We didn't actually measure movement at the time. I would double-check that the steps/per figure is still set OK, just in case something has changed there. Certainly not obvious why that gcode shouldn't run just fine, though.
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14-09-2016 #6
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14-09-2016 #7
Didn't appear to be multi-start. I quickly checked pitch with a caliper, mainly to make sure that it was 3mm and not 8tpi, bit it's not the most accurate measurement to do. The x54 move giving about 56mm movement is slightly odd as that doesn't tie up with either pitch. Unless steps per has got itself changed. The current motor mounts are a bit crude (plan is to remake) but I can't see how any flexibility in that or missed steps would give too much movement. X and y axes seem to move smoothly enough. Should have done a bit more testing...
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