Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: marting on December 26, 2015, 05:04:00 AM
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Hi Guys, I been experiencing some problems lately with "deformed" cutting paths and have replaced one of the encoders, as I thought it might have got dirty or something. Now I have made a trial run by cutting 9 holes on a matrix of 3 x 3 and diameter of 15 mm but am not happy with the results. Following measurements, an ovality it resulting, measuring at one position I get 14.78mm and 15.21mm in perpendicular position. Could it be that I need to lower the motor speed in the "motor tuning ans setup" dialog or maybe recalibrating the ball screws?
Has anyone ever came across such a situation, any advise?
Thanks
Marting
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Hi Guys, I been experiencing some problems lately with "deformed" cutting paths and have replaced one of the encoders
It's more likely to be your calibration than speed, what happens if you drill a square pattern of holes?
With the mention of encoders along with no other machine information you've lost me.
If you've posted full machine details somewhere else a link or pasted text would save folk from going hunting for it in order to read up in an effort to help,
Regards,
Nick
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Hi Magicniner,
I've further run some test cuts to verify the source of problem by elimination. It seems that the encoder wasn't defective after all and it results that I've got a teeny weeny problem of squareness between the X and Y axis. After having cut a rectangle (570mm x 450mm) and measured the diagonals, I found a difference of approx 0.3mm. At first I wasn't quite sure but after having simulated the same situation on CAD it shows that this little difference could indeed produce the results I've experienced :o. I'll be trying to rectify this next Monday and will post the results. Thanks for the support.
Marting
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Hi there again, I have re-calibrated the squareness / perpendicularity between the X and Y axis and are now spot on. Following that I executed many tests and with different approaches but still with same results. I am now suspecting that it may be a Mach3 software issue, as I had it upgraded from version R3.038 to R3.043.066 about 5 months ago and that other than that nothing else has changed. I am also attached are photos showing what is happening maybe some here may have an idea why these deformation indicated by arrows are occuring.
Thanks
Marting
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That looks exactly like the problem I had which turned out to be backlash, have you checked X for backlash with a DTI?
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That looks exactly like the problem I had which turned out to be backlash, have you checked X for backlash with a DTI?
I have to agree. If it isn't backlash and/or flex I would be :o
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Good morning Guys, further to my anquiries it results you were both right, it was backlash. I have restted the ball nut and all is up and running again.
Thanks Guys Marting
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:) Glad you got it sorted.