I was doing a circle pocket 1/4" deep in 1" material using a 1/4" upcut, was cutting at a depth of .25, basically it was this round piece of pine, was putting a pocket in it, started the work from the center and I thought things were going alright when I was sitting at the back of the machine and well things got loud so I hit abort and discovered basically the further from the center it got it would be stepping down a bit deeper and eventually went all the way into my spoilboard that was when it got loud and I hit abort. What would be the cause of that? Too high of speed at too much of a depth? Also when I was trying to zero in my z my interface had a disconnect and drove into the wood a little till I had to hit the power button on blackbox so I don't know if that done something.
Possible, what speeds and depths were you running at? A loose collet nut, or undersized tooling (6mm shaft in 1/4" collet for example) can pull out while the job is running, do check if the buit pulled out of the collet, or whether the Z axis itself dropped. If its the Z itself, also check mechanicals (loose setscrews on shaft coupler?) and also wiring (docs:blackbox-4x:faq-identify-motor-coils [OpenBuilds Documentation]) Also make sure your Z axis Max Rate and Acceleration is tuned correctly so it doesn't stall during lifts at speed (Grbl v1.1 Configuration · gnea/grbl Wiki and Grbl v1.1 Configuration · gnea/grbl Wiki)
Definitely on the aggressive side. DOC should be more like half tool diameter (so 1.8") and then lower feedrate as well. Start slower and work up to a comfortable level
Well I finally made it back out to my machine and sure enough it was the bit that slipped lower so guess I just slipped up and didn't get it tight enough that time.
That's a good catch then its one of those things you'd never think to check until you know about it. Happens to us all! Glad you found it
