I feel I've done just about everything. -Adjusted eccentrics on all axes to (finger rollable). -Adjusted belt tension per video suggestions with zips on the ends to stop the loosening of the belts. -Checked Z motor coupler to screw is on the flat spots. -Adjusted Z eccentrics to tighten Z on the Y gantry. In the video you can see the Y axes stall for a second. And the smaller the circle the worse. Any help would much appreciated. Thanks All,
Have you checked the drive pulley fixing to the motors? With the motors powered on see if you can move the drive pulley - even a very small movement could cause your problem. The grub screw fixing the pulley to the motor shaft often doesn't get a good grip - use (non-permanent) loctite on the grubscrew thread if necessary. Make sure (you probably already have) that the grub screw is onto the flat of the motor shaft. Alex.
Checked that, and went threw all the eccentrics again for a smooth roll and it’s got even worse. Not sure what’s happening.
I created the circle file in 2 different design softwares and both look the same. Not sure at this point. my gantry measurements are spot on from corner to corner.
Axlhoss, what the pictures show is a typical backlash. If you checked all your screws/connections, as suggested above, and you're sure all is fine check for backlash by running the machine one axis at a time. Look for youtube videos for how to do it. Let us know if you find them and if it worked for you.
I’ll be sure to check ASAP. I’m also experiencing a 1/8 inch difference in all of my cuts. I was making boxes and kept finding that I had a 1/8 inch short side on each panel. The box was designed correctly so it must be missing a step somewhere?
I was also wondering if there was any simple way to access the Y gantry drive pulleys. Just to check the grub screws on each side without having to take the table apart? Thanks all for the help.
That 1/8" could very well be from the backlash. You don't, normally, see the backlash in straight lines just the effect of it.
Alright here we go...... What I did was remove the belts from the rails, engaged the motors, pulled back and forth on each of the Y gantry belts and sure enough the pulley grub screws were completely loose on the left side and that 1/8" of slop on the right. I was able to reach inside and tighten them but I'll eventually take it apart and loc-tite them in as its an awkward spot to get to. Here's the most recent project with all lines actually meeting up. Thanks for the help everyone.