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General Mach Discussion / extrange behavior in Z axis
« on: May 11, 2009, 08:07:43 AM »
Dear friends, something weird is happening me from time to time.
I will explain
I create a piece in cambam and export gcode, i verify the g code by hand ( you know what i mean ) and also with a couple of simulators, also in mach the gcode seems to be correct...
Well the problem is that sometimes, can not reproduce the problem consistently, the z axis gos lower than expected, lets say that the progarm says to go z-10 and ig goes to z-13 and from then on everything is done with this -3 offset, so when it is instructed to go to z1.5 it is really on z-1.5 and... piece damaged, mill broken, etc...
The explanation given is just an example, it can have -3 added or maybe -1.0935 or whathever, the problem is that z goes down more than expected, but if the gcode is reexecuted it will work correctly and maybe tomorrow it will fail again but in a different line of code.
I have only seen this problem with the Z axis
Any clues?
Sorry about my english :-)
I will explain
I create a piece in cambam and export gcode, i verify the g code by hand ( you know what i mean ) and also with a couple of simulators, also in mach the gcode seems to be correct...
Well the problem is that sometimes, can not reproduce the problem consistently, the z axis gos lower than expected, lets say that the progarm says to go z-10 and ig goes to z-13 and from then on everything is done with this -3 offset, so when it is instructed to go to z1.5 it is really on z-1.5 and... piece damaged, mill broken, etc...
The explanation given is just an example, it can have -3 added or maybe -1.0935 or whathever, the problem is that z goes down more than expected, but if the gcode is reexecuted it will work correctly and maybe tomorrow it will fail again but in a different line of code.
I have only seen this problem with the Z axis
Any clues?
Sorry about my english :-)