Alternatively A2ZCNC do some nice endmill holder for either the Taig or ER16 spindles. If you use the standard motor setup, the ER16 spindle is a good choice, easier to find a range of collets when you want spares. I was limited to 2800, so I fitted a Kress 25k spindle, giving me a range of between 5k and 25k (and a lot more power), much more suitable for cutting ali and doing fine work and engraving. I think the biggest problem with the Taig for your use is the maximum spindle speed (depending on the exact build) is limited to something between 10k and 2800rpm. I'm also making my own microstep stepper drivers to replace the half step drivers that were included in the sale. I remade all the mounts to a workable setup, and now I can get decent results, I'm using the mill to make new motor mounts for all three axes. The X & Y motor mounts were home made, the Z axis wasn't converted at all. I can't comment on the Taig sourced cnc setup - I bought mine part converted (badly) to CNC. I can get backlash down to 1-2thou easily enough. and plastics, for the sort of thing it sounds like you want it to do (I'm in the electronics business too). It's a good stiff machine for it's size, easily good enough to produce good results in Alu. Mine's a pretty old machine, and the newer ones have some siginificant improvements in the ways (better Z axis, better gib adjustment, adjustable lead nuts etc.)
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