I am working on a high-speed spindle installation for the Taig Micro-Mill. It’s probably been done before (hasn’t everything?). This is my own original attempt.
I purchased an 800-watt (1 Horsepower) VFD spindle on Amazon. Dimensions are 65MM x 195MM, which is a reasonable physical size for the Taig Micro-Mill. The 1 HP is certainly overkill for the micromachining I perform. But smaller, lower power spindles I looked at were not VFD control, had poor runout specs, and only 12.000 RPM speed. Most were 100-volt DC motors with a collet holder on the shaft.
The spindle I chose is a four bearing (4 is a good spec), water cooled, 24,000 RPM, VFD controlled (3 phase motor). Speed is controlled by varying the frequency (up to 400 Hz), not varying the voltage. It is an Alternating Current motor, not a direct current motor. A VFD provides superior speed and power control for spindle operation.
Follow the conversion progress in The Hobbyist’s Machine Shop Blog
Full article now available HERE: https://thehobbyistmachineshop.com/cms/projects/high-speed-spindle-for-the-taig-micro-mill
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The Taig line of small machine tools extend their useful application far beyond the hobbyist realm. It's the reason we added RDS (Ramblin' Dan's Store) to "The Hobbyist Machine Store" business name.
I personally use the Taig Micro-mill for precision carving of wax master models for use in the lost wax casting of jewelry items. I also have one mill set-up with mist cooling for machining almost any type of metal. Taig tools are small but highly accurate machine tools.
Ramblin’ Dan Kautz