Diy Brushless Spindle

[Villacherman]

Neil,

Great work so far on the spindle, I'm anxiously watching how it turns out. I'm building a similar spindle, however, I'm thinking of incorporating a v-belt pulley drive so if I want to change the speed/torque I can have that option. Does complicate things a little more.

My intent is primarily to machine aluminum and hard plastics. I'm designing for 500-4000 RPM with hefty torque to use with 3-12mm end mills.

Anybody have an idea if these type motors will deliver decent torque at 500 RPM?

Adam

[Jonathan]

Anybody have an idea if these type motors will deliver decent torque at 500 RPM?

Not unless you either rewind the motor to get a lower kv, or use belts, which you are doing. Still 500rpm is pushing it with one belt reduction. I think you'd need two. My brushless motor spindle is a big 12 pole motor, so it's quite slow - but still 6000rpm on the full 50V. Eleven to one reduction isn't happening with one belt, but 3:1 to get max 2000rpm would probably be fine with that motor. You would only get about a quarter of the power out of that motor, but a quarter of 6kW or so is still plenty!