We build our spindle completely from scratch and power it with a brushless DC motor. (It looks like a stepper motor but it’s not) The brushless motor provides great power and has no brushes to wear out. To make sure we have a long-lasting, sealed motor, we sourced high-quality Japanese bearings and sent them to our motor manufacturer. We didn’t want to take any chances.
A brushless motor requires a complicated drive system to get it to turn, it’s not like a regular motor that turns when you apply power. We designed a custom motor driver that monitors RPM to ensure that spindle doesn’t bog down in a heavy cut.
The spindle itself is an ER-11 unit that takes standard collets, we don’t lock you into proprietary systems. ER-11 collets are available for cutters up to .25″ in diameter.
Last, but far from least, our runout is < .001, measured in the ER-11 taper.
Just a bit of trivia for you, the big chunk of aluminum on the left starts as a sold block and is machined in a single setup to ensure perfect alignment. It costs more to do it this way but we’ve never put a frame together and found out that things don’t line up.