I’ve managed to snap two bits in my Lowrider and I’m not quite sure what the issue is.
FWIW, it’s actually the one endmill bit I’ve broken twice, the first time I assumed it had just come loose and fallen out, there was enough shank remaining to reinsert it into the collet. Only when I went to remove it the second time did I find the piece of shank in the collet from the previous break. As I didn’t realise I’d broken it the first time I didn’t bother to play with any settings, just tightened the collet more.
Both times it appears to have broken flush with the collet, about 20-30mins into a job.
I’m cutting plywood, running at the minimum speeds recommended on the milling basics (about 8mm/s feed) with a depth of cut around 1.4mm. Not sure what RPM my router is running at (currently sourcing an optical tachometer), but on the box it says it can do 11,500-32,000 RPM and I’ve probably got it set to about 80% of maximum.
Not sure if I need to adjust the feeds or something else. Reading about cutting plywood it sounds like I can get away with a much faster feed rate, however in my mind this puts more lateral force on the cutting bit. Is it possible that I’ve over-tightened the collet?
Just wanted to get some advice with I wait for my replacement bits to turn up. Apologies if this isn’t the right place to post this, I appreciate that this issue probably isn’t strictly related to the Lowrider hardware.