I apologize if this has been discussed before - I couldn’t find anyone with a similar issue.
I am cutting corbels out of 4/4 white oak using a 1/4" end mill. To make a completely through cut, the machine will make 10 passes. However, after approximately 3 or 4 passes, upon establishing the new depth of cut at the beginning point, as soon as the bit contacts the workpiece, it “pops” back up ever-so-slightly so as to continue the path without contacting the piece. It continues to do this every single pass until the job is complete, leaving the piece only approximately 30% cut.
I have tried increasing the spindle speed to no avail. I have no clue what may be causing this issue and cannot afford to continue sacrificing one inch pieces of white oak.
I had a similar issue. My Z belt was not tensioned properly. So it would work down to about .35 to .4 inches, but would not cut deeper. Set the tension properly and the problem was solved.
I too think I have been a vicim of this issue. Although it took me a little while to figure it out.
Then when I homed my machine I think it over traveled and mashed my limit switch
This sounds like a belt skip, but I would like to mention - sometimes the Router itself needs to be positioned up or down in the clamp to allow for the maximum depth of the job to be reached.
A cheap air cylinder with a plastic reservoir to keep the force constant would work. I don’t know if it would be worth the pain of having to adjust the pressure every few days though.
I have my belt tight and I have a lot of problems with my SO3 losing steps on the z axis when I cut with a 1/4" endmill any material harder than plywood. Its the only persistent problem I haven’t messed with to see if I can fix it. If I’m cutting plastic or something harder than plywood, I typically just use a 1/8" endmill if its not time prohibitive and it won’t lose steps. Otherwise I set my plunge rate to 5 IPM. Sometimes I’ll just use a ball mill if I can.
If MeshCAM had an option to ramp or spiral into cuts it probably wouldn’t be an issue but it doesn’t have that option.
I might try just removing one of the springs to see if that helps. I’m guessing that will introduce some cocking since the z carriage isn’t that stiff. Or, maybe just sliding the router further down so that the springs aren’t under as much tension.
Thanks for the advice. I used an 1/8" end mill and it’s working well. Once this project is finished I will try to address the belt skip. Thanks again to all who responded,