Crooked Gantry, Bad IS (Solved)
Hello, I recently upgraded and as part of my diagnosis of some IS issues, I noticed how crooked my gantry is. While I had previously corrected this by tensioning the belt. I have noticed that my belt tension graph did not appear to be changing. I loosened all the fasteners on the y gantry blocks, the belts are slack, but it is still crooked. The left y carriage with its blocks loosened does not mate against the endstop.
My understanding of the guide is that I am to pretension the belt then screw the gantry plate back into place, and this is what I had done. But is this just covering up the issue? The carriages slide smoothly, which suggests to me that the issue is not a misalignment of the rails.
8 Replies
Left mates perfectly, right only meets under tension.
What happens is that when the belt is loosened, the gantry returns to a crooked position. What I'm working on overcompensating (not just even) so that when the tension is even the gantry is straight.
Loosen the bolts that attach the jointers to the Y rails so there is a little bit of play. Bring the X axis to the front of the machine and position it so the ends of the X axis are the same distance away from the front extrusion. Then tighten the bolts to the jointers. Now your X axis isn't crooked and you can evenly tension the belts
I used 1-2-3 blocks and clamps to ensure even spacing while tightening the jointer bolts again
I ended up preloading the bar the other way so that when it was untensioned it would be even. What are 1-2-3 blocks?
Precision blocks that are 1 inch by 2 inches by 3 inches
Thanks for the suggestion, I think there's probably a bit of a chicken and egg situation with the slop between each fastener.
That's one problem fixed