I’ve been experiencing losing my zero point when changing bits. When I’m doing layered text projects that are detailed and have 3 tool bit changes in one layer going from 1/4" to 1/8th" then finishing with a 1/16th" for fine detail, I find that the 1/16th" usually ends up being out of register or off center. Your advise or observations would be greatly appreciated.
If just the X or Y are out, perhaps one or more of the machine’s axis are slipping a little during the other operations, in which case you might need to slow things down a little for those toolpaths or inspect your machine for mechanical soundness.
Or maybe the X&Y zero was never correct (maybe because your endmills are not exactly 1/4" or 1/8") and the error only really manifests when you get very small. You could try setting the zero with the tiny endmill instead.
Is this a new problem… has this happened before on other projects?
Were you seeing this flaw in the simulation?
I ask this because I had a similar problem… I found that it was in the way I was designing.
the machine was following the toolpahts that I gave it.
in the simulation Id have other marks digging into my other layers. That was until I went to using the same line to create a new tool path.
before… I was layering new lines into of my old ones to make new tool-pahts from… I found this to be a No-No
Thanks David for your reply…
After all the great suggestions and input from fellow cnc’ers on the subject, I believe my problem was exactly what you mentioned. I normally tighten my bits in the collet pretty tight. When I go to change them I do make a noticable movement on the router. So between that and using a much smaller bit size to set X,Y,Z position when starting a project, the problem of keeping a zero point has been all but eliminated.
Thanks so much for the input…I’m always learning.