HDM vs 5 Pro in Hard Materials

[WillAdams (William Adams (Carbide 3D))]

There was a bit of discussion along these lines at:

S5P Spindle for Aluminum Machining

A couple thoughts: The 65mm VFD spindle is already capable of a lot. This was a test where I pushed it very close to stalling, but if you back off the speeds just a little bit it can be run reliably: https://www.youtube.com/watch?v=UqL-VyHb8l0 Yes a larger collet is nice, but in aluminum I would basically never use a 1/2" endmill unless I was doing light surfacing. Bigger endmills have to be run at lower RPMs, and you’ll fall out of the torque band of the spindle. The sweet spot for aluminum m…