I'm considering building a CNC Machine center using the R8 spindle and mount off my X2D from Little Machine Shop but replacing the tiny motor with a 2.2 kw VFD spindle as the drive motor with the stock gearing. I'm wanting to increase feeds and speeds and horsepower without going too fast for the material. I don't trust the ER-20 collet to hold the drive gear without slipping, though. Has anyone used one of these as a drive motor? How would I go about this?