Bad circles plasma
25 Sep 2021 17:34 - 25 Sep 2021 17:38 #221564
by paulsao
Bad circles plasma was created by paulsao
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Last edit: 25 Sep 2021 17:38 by paulsao.
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25 Sep 2021 18:19 #221568
by tommylight
Replied by tommylight on topic Bad circles plasma
Mechanical backlash from the looks of it.
Check for something loose, pulleys, gears, pinion to rack, belts...
Check for something loose, pulleys, gears, pinion to rack, belts...
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25 Sep 2021 20:17 #221573
by paulsao
Replied by paulsao on topic Bad circles plasma
Check everything and everything is safe, now that I think I have 2 dm556 drivers for the y axis and 1 tb6600 for the x axis, can there be a problem in that?
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25 Sep 2021 21:47 #221579
by chris@cnc
Replied by chris@cnc on topic Bad circles plasma
I think yes. It looks like one axis accelerates faster than the other. Compare the parameters. It is good if all have same stepscale, acceleration and velocity. Mark the transition.
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26 Sep 2021 01:45 #221595
by paulsao
Replied by paulsao on topic Bad circles plasma
Someone has another idea, change the drivers to use the same I put the same bands and sprockets with the same number of teeth the same scale, check and everything is safe, the speeds of the x and y joints are the same I don't know what else to do
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26 Sep 2021 03:09 #221597
by PCW
Replied by PCW on topic Bad circles plasma
It really looks like mechanical backlash or a
combination of spring and stiction to me.
I would try jogging back and forth in the axis with
the worst error and checking for lost motion with
a indicator
Its mainly along the axis which is a line between
the two arrows of the plot.
combination of spring and stiction to me.
I would try jogging back and forth in the axis with
the worst error and checking for lost motion with
a indicator
Its mainly along the axis which is a line between
the two arrows of the plot.
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26 Sep 2021 08:01 #221614
by tommylight
Replied by tommylight on topic Bad circles plasma
What is the step scale and what microstepping ?
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26 Sep 2021 14:18 #221632
by paulsao
Replied by paulsao on topic Bad circles plasma
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26 Sep 2021 15:00 #221640
by chris@cnc
Replied by chris@cnc on topic Bad circles plasma
Looks better. But circle is not quite round yet. The xy axis is not square. You can adjust y gantry little. Attach a pencil and draw a square on paper. Turn it same place around and draw again. Now you see error and adjust the half in homing offset.
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26 Sep 2021 16:26 #221643
by tommylight
Replied by tommylight on topic Bad circles plasma
Can you set microstepping to 1/4 or 1/8 and scale accordingly and test again?
Direct drive with big pulley = no good.
Now that might be due to microstepping and the inability of motors to keep position when at any other angle than 1.8 degree due to forces/momentum/inertia/etc.
Direct drive with big pulley = no good.
Now that might be due to microstepping and the inability of motors to keep position when at any other angle than 1.8 degree due to forces/momentum/inertia/etc.
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