But Iām not leaning on the table investigating it while also causing it.
I had the longmill going today making a small plaque for my neighbor and everything was running smoothly for about 80% of the carve. I saw a friend walking by so I stepped outside to say hi and we chatted for a couple of minutes. When I came back in it was no longer cutting the wood. It was cutting air about 3 inches above the wood. I then paused it. I click āgo XY0ā and it goes to the correct XY0. I click āgo to 0 for Zā and it goes about 3 inches up above the wood. I used Carveco Maker+ for the design and gcode. Also used Gsender, the latest version I think 1.0.0
Any ideas? Pic and Gcode on Google Drive are below. Thanks
@Swinly Apparently, you need to give me some sort of permission to look at the file. Iāve logged into my gmail account and sent you a request for access.
@Swinly I have it, Lonnie. Iāve taken a quick look, but it is about 380,000 lines, Iāve not looked closely. However, searching for any Z moves greater than 1" positive reveals that there are none. So, at first blush, itās not the gcode. How thick is the piece?
Well, I got the longmill going right now and everything is looking good. I didnāt know what line it stopped on so randomly picked a number about 80% through the gcode and started from there. It caught up to where it left off and is looking good. Slight variation in the Z but I can fix that with a rotary tool.
Do you think maybe I had the anti-backlash nut too tight/loose and the Z got stuck or slipped during a Z movement? Iāve had some pretty good swings in temp/humidity the last few days here in South Texas. I did adjust the anti-backlash which solved (I think) my other thread about a sound it was making.
Hard to say since you werenāt in the room when it happened, but one other area Iād suggest a check is the linear guides. If you remove the two bolts to the anti-backlash nut in the z-axis then youāll be able to smoothly move the z-gantry along the rails and feel if theyāre still moving along smoothly
If youāre feeling some roughness or bumps then Iād recommend adding in a couple drops of oil as we recommend for regular machine maintenance: Maintenance š ļø - LongMill CNC