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Topics - bonzo_nz

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I have a random and reoccurring problem with Mach3Turn where the X axis DRO values swap from + to - during a cycle, causing the tool to crash into the stock.

Yesterday, I started Mach3, homed my Z and X axis to the back right of the lathe, turned down the X axis, measured and entered the value into the DRO and faced the Z axis and zeroed it. I'm just using a basic RH turning tool. Everything seems fine - I can jog and enter G00 commands into the MDI and it goes to the right place.

So I ran a turn wizard to turn the OD down. The first cycle goes smoothly. Then I ran a second wizard to turn the OD down some more (same settings, I just changed the X and Z start and finish values). I ran the cycle and the first few cuts went well and then all of a sudden, BANG, the stock flies out of the chuck (luckily I was using delrin, aluminium is more heart wrenching) and the tool moves through where the stock was, to the other side and keeps on going there (now - X values in the DRO). I restarted everything and ran the code three times cutting air and nothing happened.

Then I came to it today and did the same thing - trying to make the part I couldn't yesterday. A bit skeptical (after about a month of problems and trying to get things working smoothly, my trust in CNC is very low), I set the job up as before, but backed off 50mm on the Z axis to test the cycle in air. Same thing. At my wits end, I took screen shots of all my settings and compared them to my version on my laptop (never changed, just used for learning the screens). They are the same except that "Remove Tool Offset" under Pgm End in General Logic Configuration is unchecked, as I found that this caused a similar problem, where after running a cycle successfully, and starting another wizard, the DRO values were messed up (similar to the last screen shot).

This is not the first time this has happened and it happens randomly.

This is the crash. All the cuts are fine and then it moved to the other side and does the finishing cut.



Cutting on the wrong side...



Trying to make new GCode in the wizard afterwards:



This is the GCode generated from the wizard:

Code: [Select]
G18 G40 G49 G90 G94 G80
M3
G0 X26 Z2.5
F500
G0 X24.4
G1 Z-17.9
G0 X25.4 Z-17.5
G0 Z2.5
G0 X23.8
G1 Z-17.9
G0 X24.8 Z-17.5
G0 Z2.5
G0 X23.2
G1 Z-17.9
G0 X24.2 Z-17.5
G0 Z2.5
G0 X22.6
G1 Z-17.9
G0 X23.6 Z-17.5
G0 Z2.5
G0 X22
G1 Z-17.9
G0 X23 Z-17.5
G0 Z2.5
G0 X21.7
G0 Z2.5
G1 Z-17.9
G1 X26
G0 Z2.5
F100
G0 X21.5
G1 Z-18
G1 X26
G0 Z2.5
M5
M30

Thanks in advance for any help (please help!)

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