Chasing accuracy problems and trying to get my Y even. Repeatably I get 2440 on Y0, and 2338 on Y1. Belt tension is guesstimate the same. If I tighten Y1 to try and bring it to 2440, it doesn’t do much because you are moving Y min closer to the middle at the same time when you tighten. Even with Y1 extremely tight compared to Y0, its still off. As I understand on Jackpot you can’t do different steps on Y0 and Y1?
You’d have to reconfigure your endstop(s) after the tension adjustment.
That moves Y min and Y max, just moving the 2338 to somewhere else, I adjust endstops to get it square, not to get Y0 and Y1 the same distance
I”m measuring from an outside cut at 0,0 to 2440,0 and from 0,1220 to 2440,1220. The first comes out 2440, the second 2338
Don’t try to measure distances or adjust belt tension or steps/mm using cuts. Instead, use a v-,bit to mark the spoil board. This eliminates things like deflection and looseness from the measurements.
If you are 2mm short on one belt, you will need to tighten that belt 4 full turns (thread pitch is 0.5mm per thread).
After that, you may need to re-adjust the endstops to achieve square.
You aren’t moving YMin when you are tightening the belt, the origin remains static, but the YMax mark should move (slightly) with the belt tension.
Caveat - we had a user on the forum a few days ago that was getting 2mm longer than expected movements, regardless of distance travelled. He found that he had damaged the belt by overstretching it. Try to avoid doing that.
Y min was the wrong description, but what I mean is when I stretch Y1, that means that the 0,1220 position changes along with the 2440,1220 position. 0,1220 farther from the edge of the machine, and 2440,1220 gets closer to the edge of the machine. I can’t stretch only the far side of the belt of course, I have to stretch all of it which changes 0,1220 as well.
2-3mm seems way too much to be a bit problem, thats almost the entire bit size. I do have a vbit but that puts the cut in the center of the spindle and the depth of cut changes the width of cut, changing what I measure from the edge of the cut, it’s hard to accurately measure from the center of the cut of course, so instead I do an outside cut and measure from the edge. My cut on an 1/8 bit actual goes outside the 1220/2440 so that the edge is right on 0, 1220 and 2440
Tried tightening Y1 by 5mm, making it much tighter than Y0, and it still measures 2338. It did shift all of Y1, moving the 0,1220 farther from the edge, and 2440,1220 closer to the edge
I really don’t understand what you are referring to with 0,1220 and 2440,1220, and which edge you are talking about. Perhaps you could post a picture to explain.
X and Y coordinates. I’m backwards it looks like. At 1220 X and 0 Y I measure to 1220 X and 2440 Y.
When facing the spindle, the 1220 X and 0 Y position gets farther from the edge you are stand at when I stretch the Y1 belt on that same side. Which also moved the 1220 X and 2440 Y position. Stretching 5mm of course didn’t move the points 5mm, more like 1-2mm