Help! I ran through the calibration process so many times this weekend I’ve lost count. I’ve got everything measured as close as I can, and the chain calibration procedure is spot on (yet somehow is only 2mm accuracy??). The issue I am having is the lower corners have extreme chain slack, which makes calibrating by measuring from the lower corners virtually impossible.
I finally tried cutting a part on the RH side of the frame and as it got toward the lower rh corner, but still a significant distance away, the cut got really, really bad. The RH chain was taut, but the chain coming from the left would develop a ton of slack in it at a few points and cause massive errors.
Afterward I moved my sled to the RH middle of the board and just pressing down with my hand with a few lbs of pressure would cause a significant movement of the bit because of the slack. Is my sled too light? Chain too heavy?
This is a picture of some slack while cutting:
Here is the piece I was cutting, notice how the bottom right is a shitshow. The rectangle with part of the corner chunked out is where I tested by adding pressure, which made it cut the correct line.
This is what the part is supposed to look like:
This problem also appears with holes… the friction of the sled will mean it sticks and stops instead of following the hole accurately, so small holes are really oddly shaped (these are supposed to be 0.292", cut with a .125" bit). Even in the upper center, my holes are not very circular.