Interesting discussion on ER collets. It led me to look at changing my clunky Clarkson on the home-built Dore Westbury I have, which then led to the discovery of these ER16/20mm milling chucks: http://www.arceurotrade.co.uk/Catalo...-Collet-Chucks (4th item from the bottom of the page).

The idea that occurred when I spotted this item was to make my own high-speed router spindle, using one of these, a set of decent bearings and a nice, big, RC model electric motor.

Having now ordered one, plus a couple of collets, for use on the new machine it looks like I shall have to soldier on with the old Clarkson in the mill for a while longer..........

Jeremy

PS: No shortage of smilies for me