Thank you for your video. I have been dealing with my laser being out of square for a while now. Your video pointed me in the right direction and YES it worked. I solve the problem of getting a square to measure rail to rail by clamping a 1-2-3 block the Y rail. That gave me the height and a good reference to use my square to straighten it out.
With most macvhines the Y belt tension is achieved by adjusting a unit on the backat each end of the gantry. If you tighten the ajustments differently this may be the real cause of the gantry being off square so be careful to adjust both belts by the same amount. The method demonstrated is exactly what you need to do, with the big sqaure and equal diagonals method. However there is one impoertant point missing from this video..... the gantry bearing blocks. Those bearing blocks are usually pre-tensioned onto the rail to ensure they are bscklash-free. If you twist the gantry then you are twisting the beaiing blpcks out of line with their free running position and this will result in premature bearing wear.. It is therefore important that your slightly loosed the end bearing blocks so that they can "float" into thier natural stress-free alignment. Dint forget to retighten them after you have squared the axes..
Thank you for sharing! Very useful! This should be the starting point of a proper laser calibration/alignment. Regarding the squareness between the x and y linear rails, do you think a 3d printed custom square would be accurate enough ?
