I think Pres has it right: lube the ways and screws. I put a few small squirts of lube on the ways and screws before each job, and do a full lube before and after each day's work. If I don't do this, it'll miss steps, although it's mostly my Z axis that loses it.
I noticed in your previous post you're using WD-40 as way lube. I'm not an expert, but that doesn't sound like a good idea to me. The instructions for my Taig suggested Automatic Transmission Fluid, and now I'm trying Vactra to avoid the ATF smell (per another thread here).
BTW, after re-zeroing the axes, you can have Mach3 start the job from where it failed. I usually backtrack to the last application of the cutter (Z goes negative), use the "Set Next Line" and "Start From Here" to have Mach3 develop a setup move. Make sure the coolant is on and the "start spindle" button is checked, though!
mTp |