I just picked up my set of these from the post office… Ordered on October 25th from AliExpress so they took almost exactly a month to arrive.
Cost me £39.04, plus £8 VAT and £8 post office 'handling fee'…
Mike – I put the sizes I wanted (20, 16, 12, 10 & 8mm) in the "message to seller" box and the right ones turned up!
Finish on them is ok, but nothing more. The important bits appear to be nicely ground, but the rest is very average.
Had to run a tap down the drawbar threads, otherwise I couldn't get my drawbar to seat them properly.
They don't spin in the taper either on tightening or loosening, which was one of my fears – them not having drive dog slots. The collets self-lock, requiring a tap on the drawbar to release, which is good – the cutter doesn't fall out on the table / work…
Very quick measurement – my spindle taper on its own has a runout of ~0.5thou. My ER collet chuck taper has a runout of ~1.2thou. A 10mm collet + cutter appears to have a runout of ~1.4thou.
The direct collets have the following runouts:
20mm – 1.5 thou
16mm – 1.6 thou
12mm – 2.6 thou
10mm – 2 thou
8mm – 0.8 thou
And a proper 2" daylight increase – probably a shade more if you were to remove the drive dogs.
I haven't done any work with them yet so I can't comment on their holding power…
Satisfied so far…
Thanks for the pointer to them!
Cheers,
Jez.