I just recently got my ArcDroid, and its brilliant, but cutting my first part that needed to be accurate shapes and square, I discovered the ArcDroid was cutting parallelograms rather than squares, tried multiple Calibrations, and they were never straight (Y axis not at 90 degrees to X)
I tried adjusting belt tension both tightening and loosening without any improvement, but while checking this (by locking the arms using double tapping “zero”) I noted the smaller arm had about a 10mm movement with medium force before I felt the firmness of the stepper motor holding its position, further force would then push past this.
Opening the ArcDroid confirmed this movement was in the arm and not the shaft/belt/stepper motor.
I simply tightened the bolt on smaller arm snugging it down and the movement completely went, straight after another calibration the X and Y measured near perfect on the calibration triangle and are now 90 degrees to each other, and all parts are cutting true.
Just wanted to post this as something worth checking if having issues calibrating, or getting true cuts/squares.
Here is the bolt I tightened:
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Thanks for sharing your AD problem and more importantly the solution.
I don’t think we have seen mention of this bolt before so it’s good to have it documented.
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Are the chips and gouges on the cover there from the tightening or from it being loose? Seems like maybe a bit of a QA oversight or something there.
I think that looks worse in the photo than it is, due to closeness of the photo, it’s just the edge of the casting of the top arm I believe.
