# Fell of the top of the board then belts snarled inside the spools **URL:** \ **Category:** Troubleshooting\ **Tags:** calibration\ **Created:** [October 13, 2025, 6:13am UTC](https://forums.maslowcnc.com/t/fell-of-the-top-of-the-board-then-belts-snarled-inside-the-spools/25043 "2025-10-13T06:13:42Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![dlang](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/dlang/32/859_2.png) [@dlang](https://forums.maslowcnc.com/u/dlang)\ **Post date:** [October 13, 2025, 7:43am UTC](https://forums.maslowcnc.com/t/fell-of-the-top-of-the-board-then-belts-snarled-inside-the-spools/25043/3 "2025-10-13T07:43:33Z")
wouldchuck wrote: > Made a new frame, smaller than the others. roughly 4300 by 2300. May try to > make it taller and less wide to get a better cutting area. Calibration took > about an hour? and with a calibration grid set at 400 by 400 5x5 it finally > worked but the calibration grid top row was about 10cm off of the top of the > plywood. I saved it by holding it up with my hand. Is there a way to set the > calibration grid to be centered on the original position? Here is the log in > case that helps make sense. I tried to visually center it and then reset the > xy home to that point. I had read in some of the forums that it might be > possible to manually describe the frame size as an estimate in order to speed > up calibration? I don¢t see that on the config dialogue. Where would that > be? Happy that i can finally drive my machine around using the buttons. Yay. > Perhaps I¢ll try some practice movements tomorrow. the calibrate routine starts with all belts very close to equal lengths, it currently need to calibrate around tht point. once it’s calibrated, you can shift your workpiece as you want, but for the calibration, you need a surfact the size of your calibration grid + ~150mm one each edge (+300mm total) to keep the sled from falling off > Questions in order: > > Machine fell off the top of the board, how to stop this? see above (for now) > Is it possible to speed up calibration? not at the moment [1], but you don’t have to do calibration unless you change the frame > Is it possible to center the grid on the starting position? no > Where does one enter the estimated frame dimension? that is not needed/used any longer > What is a good test file to run without cutting? just jog around with the arrows what size is your work area? I have a 1’ and a 4x8’ test grid at [Index of /maslow](http://lang.hm/maslow) you can use > How do people put a marker in the chuck for drawing or testing? a stubby sharpie can just be jammed in there Ian\_a has a thread posted recently where he has a 3d printed part that holds a mechanical pencil lead other pen holders have been posted. David Lang [1] I am doing a lot of work in this area right now. Currently it’s too easy for people to specify too small a grid or too large a grid (goes ‘out of the green’) Bar and I have been working on separate projects to try and automate this. I am also replying to this message while I wait for copilot on github to implement my most recent change to a process that would virtually eliminate the wait for it to do the calculation (where it shows the fitness scores) and I have floated an approach that would handle non-standard layouts like yours (see [Discovery on moving calibration grid](https://forums.maslowcnc.com/t/discovery-on-moving-calibration-grid/25034) for some of the discussion) please follow along on this and when I have new versions to test, it would be especially helpful for someone with an odd frame/placement to test it. David Lang --- _[View the full topic](https://forums.maslowcnc.com/t/fell-of-the-top-of-the-board-then-belts-snarled-inside-the-spools/25043)._