My concern now is my new HBM 6 inch 4 jaw chuck
I purchased a HBM camlock 3 jaw chuck with 2 piece jaws as a replacement for the Harrison 330VS at work & it is good in all respects – fits the spindle well, the jaws are a good fit in the body & grip the workpiece parallel. The top jaws are a very snug fit the the base jaws. I did a runout check on a bit of ground bar when it arrived, though I can't recall the reading – but it was low enough not to be an issue.
We also use RDG's ER collets at work on CNC VMCs, as they are a lot cheaper than the industrial suppliers & the ones I have checked have been very good for runout. No complaints from the operators about them either.
At home I have a HBM rear QC toolpost on the Super 7 – again, nicely finished, the tenon fit the tee-slots snugly & it works well.
The same cannot be said of the supposedly Myford fit Soba ER collet chuck – which doesn't. I should have sent it back (bought at Harrogate last year), but didn't get around to it at the time. It is tight, though, so it will get sorted eventually. But a small Soba boring head with interchangeable shanks is nicely made, the 2MT shank fits the machine taper well & it works fine. Perhaps Soba have a QC problem, or maybe they buy in from different suppliers for different products & just brand them all Soba ? It does seem to be a bit of a lottery as to how useable their products are.
Nigel B.