Yeah, that's the same grinder I've seen attached to various mills. Wouldn't be hard to build a mount for the X1 I think.
The "Tj-cnc" conversion gave up to 8000 rpm I think...probably still on the low side for PCB cutting I think, but good enough for small bits in aluminum. The replacement bearings were rated for 16k, so it's possible that swapping/replacing the pulleys might give even more speed. IIRC, the stock bearings get warm/hot at 4k, but haven't tried speeding things up yet.
Another high-speed spindle option I saw was the flex shaft from a dremel-like tool mounted in a modified drawbar down the center of the spindle, with the dremel head mounted in a collet. Dremel tool ran the flex shaft while the X1 spindle stayed put. I imagine that the runout of the flex tool head unit could be an issue if it's a sloppy unit.
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