I’ve noticed a consistent issue with my MPCNC that I wanted to check if anyone else has experienced.
When I cut shapes on the outside or along the line, the dimensions come out exactly as drawn. However, when I cut inside a shape, all dimensions: length, height, and diameter, consistently come out about 0.3mm smaller, regardless of the object size.
The only workaround I’ve found so far is to apply an offset of 0.3mm outward, but I’m not very comfortable relying on this as a solution.
I’ve double-checked the endmill diameter, and it’s correct because the company that sharpens the endmills always marks the new diameter after sharpening.
Other than this issue, I’m really enjoying the machine so much. I have my post-processor configured correctly for Aspire 12.5, and I can share it with anyone who wants it, or I’ll post it here soon.
Has anyone else experienced this issue? If so, how did you resolve it?
The windmill pulls itself into the material. With a finishing pass it pulls itself into the wood that’s left for the pass. So it might not actually remove something with that pass, but it isn’t too small then.
LOL, I think that autocorrect changed endmill to windmill
Even with a very small DOC, the endmill will either deflect into or away from the edge of the cut, depending on whether climb or conventional milling is used.
With a finishing pass, the amount of material being cut by the endmill is very thin, so the deflection is much smaller than on a full slot or high stepover cut.
I made an inside cut and then did a final pass removing 0.3 mm, and the dimensions came out perfectly. Once again, thank you very much for the tips and for taking the time to help!
It’s definitely flex.
