I’ve had the Shapeoko XL for a little over a month and have been able to make a lot with it, but I’ve been having problems with chattering from the minute I started working with oak instead of pine. I can adjust cut depth and/or speed to get the oak to mill, but I’m running the bits at 30% of the recommended chipload to do so. Something doesn’t seem right and I can’t figure it out. I’ve tightened up the V-wheels and belts a bit, but not real change.
All the details: I’m using a 1/4in 2 flute spiral upcut from Amana, carbide compact router, 10k RPM, and depth of cut of 6mm, 50% engagement. To not get significant chatter I have to run at 700mm/min when suggested chipload would be almost triple that. It wouldn’t be much of an issue, but I’ve noticed the bit gets moderately warm, which wasn’t an issue when running much faster feeds on softwood. I’ve tried running at faster RPM and shallower depth of cut as well, but it just gives me a proportionate increase in speed and still leaves a warm bit (which isn’t surprising with the low chiploads).
Any ideas would be appreciated.