Here is an interesting website that sells upgraded motors and headstocks for the Sherline equipment. GlockCNC
I modified my personal CNC’ed Sherline Mill with a heavy duty headstock that will accept R8 tooling. Then I use Tormach TSS adapters for quick change tooling. The R8 headstock removes about an inch of Z axis clearance so I installed a taller Sherline Z column to compensate for that. I still use the original Sherline motor, plenty of power for me. So why did I change to R8 on a Sherline? If you have ever used Tormach TSS adapters, then you would understand. Easy quick change with no tooling recalibration. I use Mach4 for my CNC program. I switch it back and forth between my Mill and Lathe.