I for the life of me cannot get the frame square on my 1010 workbee. I have tried just about everything it has about a 1/16th of an inch gap on the left front and right rear. I checked the c beam for square, and length. Flipped them from one side to the other and even changed the front and back 2040 rails. If I loosen the x axis I can get it a bit closer, but it opens up when I tighten the screws. And I even made sure the x was square. I'm losing my mind.
Is the gap between the frame and the spoilboard? If so, is the spoilboard cut square? Sorry, I am just having a hard time picturing what you are describing.
I think he's describing a parallelogram shaped frame (could be wrong). If you remove the spoilboard so you just have a bare frame, then you can tap the front right against the left rear ( blocked to prevent it from moving) thereby squaring it up. Make a measuring stick to check that the opposite corners are of equal length i.e. rear left to front right and rear right to front left. I'm assuming all your extrusions are of correct and accurate length - should be if you bought a kit.
If @Christian James's advice doesn't help please post some pics of the problem - close up as well as overview. Alex.
The frame isn't fully built yet. I am following the openbuilds video and am at the squaring stage . When I pull the gantry to the front, the left y inner plate does not touch the front. If I move the gantry to the rear, the right inner y plate does not touch the rear like in the video. Both are off about a 1/16 of an inch. So do I tap the right front towards the outside of the frame? Should I loosen any bolts on the y endplates?
FWIW, I wouldn't assume things are square by observing the cross (X) axis relative to the frame. Either or both could be out of square. I would recommend checking the frame itself is square with a large (preferably calibrated) square along a gantry (Y) rail and along the front cross piece. Then I would secure the frame when squared to the table it is sitting on or a base plate. Then you know the frame is square and it is the cross (X) axis that isn't square to the gantry (Y) rail if it doesn't line up when run up to the ends. To get initial state of gantry squareness to the frame, the system relies on the cross axis being held mechanically square to the gantry rails on startup. It may not be square due to build quality or component tolerances. Shimming may resolve this issue. On machines with a long cross axis, the gantry may simply be too flexible to reliably hold itself square. In this case, dual gantry (Y) limit switches are normally used. (I think the latest iteration of Grbl supports dual gantry limit switches but I haven't investigated this.)
How did you make out on this? I ran into same issue with the spring back effect on my x gantry. Went from obvious cause (y gantry squareness)...to the less obvious (x gantry) In the end it took a shim on x gantry rear support rail which was the culprit.. thank you china
I ended up loosening the front and back plates completely and then pulling the gantry forward and tighten it down, then did the same for the rear
