The large CNC has seemed a bit more prone to getting out-of-square lately.
I talked with @jamesfreeman about this a bit last night and he reminded me of some easy techniques to correct and mitigate the issues, but I think there are 2 things worth mentioning here:
The last two times I’ve come in, the machine was more significantly out-of-square than I had previously experienced. As in, after initial homing, the (X=0,Y=0) corner was visibly offset in the X+ direction relative to the (X=0,Y=60") corner. I didn’t precisely measure, but it looked like between 0.25 and 0.5" off. It was reasonably easy to make gross corrections to that via my usual workflow of resetting the drives and manually jogging X- to push the gantry against the stops. After that, it was better, but…
Last night, I needed to 100% maximize my sheet of plywood, so I was very sensitive to squaring. Even after @jamesfreeman helped align my sheet, the end result was still off by over 0.125" (possibly up to 0.25" across the Y axis). Luckily, that was close enough for this project, but it would definitely affect large-ish joinery projects and such.
So what’s the current expectation? Are others experiencing similar issues?
I’m particularly curious as to why the machine seems to get “extra off” over time. FWIW, my two sessions were about a week apart. I understand that @jamesfreeman and maybe others did some maintenance work on the machine around the same time (thanks!), but not sure if that could be the cause or something else is going on that’s worth looking into.