I just did the Clamp Set from the projects library. I set holes width and height at 0.330 and it cut 0.286. I also had groves of 0.220 and it cut 0.156. Finally the Piece was suppose to be 1" and it cut 0.924.
I’ve done the power tuning, I checked the step/mm test, squared the X, Y and Z. Lastly, I’ve measured my bit 0.123.
I’m not seeing a ton of other parameters mentioned in other threads. I’m beginning to wonder if my Grbl 0.8 is older? Not sure where to find what version this should be nor the directions to update it if needed.
Since all your measurements were undersized, if it isn’t a line selection issue it could be a loss of steps for some reason or other. Low pots is a common problem, but another very common one is loose or missing pulley screws. If one screw isn’t tightened in the dead center of the flat on the shaft, the shaft may be turning slightly before it engages the screw. The screws can easily work their way out, a lot of people apply a little bit of low- or medium-strength loctite to them.
Another possible problem is improper belt tension. Too high and the steppers lose steps because they require too much torque, too low and the pulley could be slipping past the belt. One good forum thread for mechanical loss of steps is [Guide] Offset cutting, Lost steps, Positioning errors, etc.
You can find Machine Inspector under Machine->Advanced in Easel. The default settings for the step/mm usually seem to be pretty close to accurate, not as far off as the numbers you gave earlier, but it’s something that might be worth looking at. I believe the values you’re looking for are $100, $101, and $102. I know the X and Y for my machine were 40.0 by default, and the Z is dependent on which lead screw you have.
Thank you. I’m going to start with the GRBL upgrade as I don’t have parameters for 100, 101, 102 etc. GRBL v0.8 only has 0-22.
RobertA_Rieke - Thank you for all the tuning pointers/trouble-shooting and links to resources. I’ll review my wheels, belts, etc. First step I’m going to do after updating my GRBL is run a test project of Inside, Outside, OnPath and Fill so I know what I’m cutting size-wise with each option.
Inventables - This does beg the question - I know for me I would find it extremely useful, if all the tuning/calibration info/resources where located in Easel via a link instead of search and discussing in the Forum. The trouble-shooting screen after a project is canceled in Easel is useful. If there were links to these videos of how to tune/calibrate if would be that much better. Additionally, this information would really helpful if it was part of the setup instructions.
ErikJenkins - looks like one needs to switch D12 & D11. Not sure how I’m going to accomplish that with the grblshield as they are printed into the circuit board. Do I need to buy a new grblshield? Or am I missing something?