I'd like to pickup some expanding mandrels that are on sale.
Enco has 2 different styles, one goes off sale this month
and the other one goes on sale next month.
Which would be better, the 2 piece one which looks like a
press fit, or the one that uses a screw to tighten.
I don't have an immediate need, other than a case
I got lucky on a set of KO Lee expanding mandrels some time ago.
They're like the 2-piece ones. Thing is, those go between centers,
so you can remove the part on its mandrel and replace it exactly.
I also suspect they're more precise.
I'm only seeing your messages as quoted by others. This
suggests that either you have the date mis-set (perhaps in the future)
on your computer, or you are posting through a blocked site, such as
"alt.net". If the latter, you are stuck, as there are too many kooks
posting from there for me to open that one back up again.
[ ... ]
They are -- especially for longer bores. The screw-adjust type
is captive at one end, so the parts are bound to tilt a bit as you
adjust the screw, so they will grip harder at one end than the other.
The two-piece ones slide a tapered ID along a tapered mandrel, so the
OD remains parallel from end to end as the size is changed.
Also -- the screw-adjust ones appear to be designed to be turned
on the lathe to just under fit, and then adjusted to grip from the
inside. This would make the fit a bit better, as long as you didn't
have to move the ID very much, but that means that it is better for use
on a project involving many pieces, as each time you use it for
something else, you will wind up machining a bit more off of it to make
it fit. The two-piece ones have a wide adjustment range, and both parts
are hardened, so you really *can't* machine them to fit -- but you don't
need to, either.
Bummer, I always value your input. I've been posting through my ISP
instead of google. Clock is set correctly.
I think I'll go with the 2 piece ones. They sound like they would
center better and be easier to use. I assume they could be used on
shorter parts also.
Thank you Grant & DoN