I completed my calibration exactly to this video and got a finest score of 0.74 I’m hoping that’s good? Question, do I have to calibrate every time I turn on Maslow4, cause it always tells me that maslow doesn’t know the lengths of the belts and that I have to retract and extend the belts fully every time I turn on and try to move the machine? Looking forward to making my first cut (72" H X 24" W Arcade Cabinet)!
Fernando Diaz wrote:
I completed my calibration exactly to this video and got a finest score of
0.74 I¢m hoping that¢s good? Question, do I have to calibrate every time I
turn on Maslow4, cause it always tells me that maslow doesn¢t know the lengths
of the belts and that I have to retract and extend the belts fully every time
I turn on and try to move the machine?
No, the calibration (where the frame anchors are) is saved in the maslow.yaml
file and only needs to be changed when the frame changes (or when we get a more
accurate calibration if you want to improve the accuracy of the calibration)
however, when it boots, it does not know where the belts currently are (there is
work to remember it, but it’s possible for the motors to move while it’s powered
off and it would never know about it), so you need to retract all the belts to
the stops to give it a known belt position, then extend and re-hang on the
anchors.
David Lang
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How can I improve my fitness result and what number is reliable for big cuts, like 72"long by 26" wide?
Fernando Diaz wrote:
How can I improve my fitness result
1st, make sure that the belts are pulling tight during calibration. If they
aren’t increase the calibration current limit.
make sure that the belts aren’t snagging on anything during the calibration.
make the frame stiffer, make sure that the Z offsets are correct (keep in mind
the thickness of the workpiece, either calibrate on top of it, or change the Z
offsets after you calibrte to include the workpiece thickness)
make sure that your calibration area is staying within the green zone
( http://lang.hm/maslow/maslow4_frame.html )
and what number is reliable for big cuts, like 72"long by 26" wide?
it’s less a matter of the size of the cuts than how accurate you need it to be.
overall, estimated anchor position accuracy is about 1/fitness in mm, and cut
position error can be as much as 2x anchor position error (worst case being
where the adjacent belts are furthest apart)
David Lang
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Also, note that the calibration values are stored in the maslow.yaml file, so you should back that file up. You may need the backup if you update the firmware and the update includes a new variable in the maslow.yaml file. You also might want the backup if you try to calibrate again and get a worse fitness score.
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