I’ve only had my Journeyman cnc for a couple of months and have been pretty conservative on the speeds. Typically 80 on 1/4" diameter bits, 60 on 1/8" and as low as 40-50 for the 1/16 and 1/32. I’ve been mostly using the Amana spektra bits and have noticed their recommended feedrates to achieve the chipload is significantly higher (often double what I’m running). I can sometimes get close with the smaller diameter bits by lowering the router speed but even then it’s on the lower end of their chipload chart. The larger bits like 1/4" bits I would have to push near 300ipm. What do you guys typically run on your 1/16", 1/8 and 1/4" bits.
I run very conservatively on mine, typically about half of what you run. I also rarely ever cut wood, I’m usually cutting some sort of plastics or composites, and sometimes aluminum. I also rarely ever break a bit, and they stay sharp a good long while. Usually run 1/4 & 1/8 bits at “1” on the router, and around 3 for 1/16 and 1mm bits, and also small V bits. One reason for my conservative feed rates is that many times I’m cutting a material that is stuck down with carpet tape, and some materials stick better than others. Too much cutting pressure can shift the part.
So do you don’t even worry about the chip load values from the bit manufacturer?
No, not really. I have mad respect for the ppl that do reference that information. But as an old-school machinist, feeds & speeds were always determined by the feel of the cut, vibrations, chip appearance, material type, etc. Even when I started running 2 & 3 axis mills it was very much the same way, always overriding the initial feed rate.