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General Mach Discussion / Calibrating (tuning) twin axis
« on: March 26, 2012, 04:56:30 AM »
Okay,
I have X and A axis together and A IS slaved to X. Problem the steps per millimeter is not the same on both axi' and having issues with getting calibration done so that I can move forward with final set up and cutting. Tools being used are Steel engineers rule, a Vernier Calipers (150 mm) and a calibrated Dial Gauge (certified to .01mm on one rotation or less and 5um on repeatability in that range).
Now what I have been doing is swapping the driver control from X to A and back and that has gotten me closer but still get error after to single axis run out of greater then 10 movements of the x axis plane. When doing air cutting tests will get .2mm error approx' in x+ and the same or slightly less in y- from the point used as 0,0. Velocity is set at 4250m/min and acceleration is set at 225mm/min^2. Movement quadrant is set up as X+,Y+.
Motors are 3Nm Nema23/4 (off size 23's) and being driven by a 60VDC 10.0A ASTEC power source Drivers are set at 3.7A (as the next setting is over the 4.2A that the motors are rated for). Drivers are rated for up to 80VDC and are based off the M752-G type series just a bit bigger and older model. The Screw are ball screws from linearmotionbearings on ebay and are 16mm dia and 5mm pitch. Micro stepping is set at 1600 on all axi'.
Hopefully that is enough information and hopefully someone can help me on this as have clients that are being very patient with me for parts to be made and have convention season upon me very soon.
Michael
I have X and A axis together and A IS slaved to X. Problem the steps per millimeter is not the same on both axi' and having issues with getting calibration done so that I can move forward with final set up and cutting. Tools being used are Steel engineers rule, a Vernier Calipers (150 mm) and a calibrated Dial Gauge (certified to .01mm on one rotation or less and 5um on repeatability in that range).
Now what I have been doing is swapping the driver control from X to A and back and that has gotten me closer but still get error after to single axis run out of greater then 10 movements of the x axis plane. When doing air cutting tests will get .2mm error approx' in x+ and the same or slightly less in y- from the point used as 0,0. Velocity is set at 4250m/min and acceleration is set at 225mm/min^2. Movement quadrant is set up as X+,Y+.
Motors are 3Nm Nema23/4 (off size 23's) and being driven by a 60VDC 10.0A ASTEC power source Drivers are set at 3.7A (as the next setting is over the 4.2A that the motors are rated for). Drivers are rated for up to 80VDC and are based off the M752-G type series just a bit bigger and older model. The Screw are ball screws from linearmotionbearings on ebay and are 16mm dia and 5mm pitch. Micro stepping is set at 1600 on all axi'.
Hopefully that is enough information and hopefully someone can help me on this as have clients that are being very patient with me for parts to be made and have convention season upon me very soon.
Michael