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General Mach Discussion / lost steps on y after a z move.
« on: August 09, 2017, 10:29:10 PM »
I have a strange problem that is repeated over many different g codes.
If I am machining a profile after each z down move I loose about 0.03 mm in one direction only. It seems to be reasonably consistent and on the vertical face there is a series of small steps in one side of the cut. So when i machine 2 mm deep with 0.2 mm steps the part is about
0. 3 mm off center in one direction only. Always the same direction. always the y axis. The g code does not show the error on the tool path screen. I have checked all the mechanical s. every thing is silky smooth, ball slides and screw with a second pre loaded ball nut for zero backlash. Not a machine geometry condition.
the machine has been working beautifully for at least 4 years now, it is stepper driven with a geko 540 and nema 23's. Any suggestions of where to look will be greatly appreciated.
If I am machining a profile after each z down move I loose about 0.03 mm in one direction only. It seems to be reasonably consistent and on the vertical face there is a series of small steps in one side of the cut. So when i machine 2 mm deep with 0.2 mm steps the part is about
0. 3 mm off center in one direction only. Always the same direction. always the y axis. The g code does not show the error on the tool path screen. I have checked all the mechanical s. every thing is silky smooth, ball slides and screw with a second pre loaded ball nut for zero backlash. Not a machine geometry condition.
the machine has been working beautifully for at least 4 years now, it is stepper driven with a geko 540 and nema 23's. Any suggestions of where to look will be greatly appreciated.