i thought u said in an earlier post the firm u work for use clarkson chucks in there millersShame theres a limited supply of ISO30 stuff and therefore would be limited to using them horrible Clarkson and ER collet types.
Personally i would junk the machine if i had to use them.
Easy enough to make a spindle lock, first thing i did on my bigger mill. Just a plunger that goes in to the spline spring loaded.
******!
i was just about to order one of the ER32-International 30 Quick Change Milling Collet Chuck
http://www.arceurotrade.co.uk/Catalogue/Collets/ER-Collets-Collet-Chucks/ER32-Collets-Collet-Chucks
when i noticed it said M12 drawbar thread, so i thought i'd double check the thread on the drawbar and i found it wasn't a M12. I have some M12 threaded bar in the shed ( from screwfix) and some M12 nuts. However the nuts would not screw onto the drawbar, the thread on the draw bar is alot coarser ie less TPI than the threaded bar.
The diameter appears about the same but the threads are different, this leads me to think it might be 1/2" as per this link (here) and so i will need a NMTB-30 collet chuck not a INT 30, or does M12 come in different coarse threads and i could have a different pitch bar?
hareng, not a fan of the ER type collet then? if not can i ask why, and what do you recommend instead?
cheers
I find that unless you get really Grape Ape with the collet closer, plain-shank cutters can dig-in and pull themselves out of an ER chuck, which is no end of a ball-ache.