Hi from Glasgow

[Doddy]

Agreed with the ER11 chuck. If you struggle to find a UK supplier then I could throw one in in the post....



...though I had one bad experience of boring one of these for a mate with a similar designed PCB router (the shaft is hardened - I tried heat treating it but with little success) - I'd see this as letting someone else experiment with a solution.

You may find that you have run-out on the spindle motor as well - the biggest problem you're going to face is all the float in the system - from bushes through to the spindle to get the resolution that you need for PCB without smashing end-mills (I prefer the 0.3mm end mills to the v-cutters, but if you look at one of those endmills wrong you'll snap it).

Having wasted the weekend investigating toolchains I'd be interested in hearing what software you're using for this.

EDIT: Having just been over to eBay - plenty in the UK. I'd seriously recommend getting a couple of pillow block bearings and creating your own spindle, driven by belt from the existing spindle motor - then you can manage the runout and end-float easier than inheriting from the motor.