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z axis issues
« on: June 09, 2018, 06:06:32 PM »
I have a desktop cnc router just had to reinstall Mach3 and config. everything Problem z axis moves - weather its + or - like its programmed in G91 but it isn't, the axis will toggle in the correct direction by hand jog but not program, also it works correctly in MDI as well any suggestions?
z axis issues
« Reply #1 on: June 09, 2018, 09:33:10 PM »
my z axis will jog up and down by toggle and in MDI but running a program it only goes to the negative with each z move weather positive or negative and advice?
Re: z axis issues
« Reply #2 on: June 10, 2018, 12:21:10 AM »
Hi,
are you using Mach3 or Mach4?
Are you using a parallel port or an external controller?
Can you post a section of Gcode that is faulty?
Is it possible that the Gcode program is calling for incremental movement rather than absolute?

We need some information to make a guess as to what your problem is.

Craig
My wife left with my best friend...
     and I miss him!
Re: z axis issues
« Reply #3 on: June 10, 2018, 09:45:02 AM »
its mach 3 parallel port running off a flash drive(which I wont do any more) here is  attached program I put in the g54 g17 g90 to see if that would correct the problem the g code is from vcarve generic gcode post
Re: z axis issues
« Reply #4 on: June 10, 2018, 10:48:21 AM »
Hi,
that file runs OK here. Try it but not off a thumb drive.

Craig
My wife left with my best friend...
     and I miss him!
Re: z axis issues
« Reply #5 on: June 10, 2018, 10:55:46 AM »
I think I have a bad connection in my wiring, tracing wires this morning
Re: z axis issues
« Reply #6 on: June 10, 2018, 03:36:52 PM »
checked all my wires cleaned that up z axis still wanting to go negative on all z moves seams to change z value every time I run the program does not restart in the same position my home was a positive # changed that to read zero the dro reads the correct # but axis keeps going down it doesn't measure what the dro is reading, motor turning? 
Re: z axis issues
« Reply #7 on: June 13, 2018, 03:15:01 PM »
Hi,
it sounds more like you are losing steps. Try a Gcode file like this:

G0 Z0
Z50
Z0
Z50
Z0
Z50
Z0
Z50
Z0
Z50
Z0

Does it end up where it started? It should.

Craig
My wife left with my best friend...
     and I miss him!