I’ve currently got a 12" DiAcro shear, and they’reworth their weight
in gold. Seriously, if it’s under $1000, and it’s in decent shape,
just get it. It’ll be the last bench shear you ever buy. Much
tougher and more rigid than anything made today for under $1500.
I’ve had a couple of the 6" DiAcro shears previously. Very nice
machines as well.
If the blade is sharp, and the gap is set right, you should have no
trouble with shearing bezel. It will curl down a little, but nothing
like the sort of ‘snail’ curl you get off of hand shears.
The blades can be resharpened reasonably easily by any decent tool &
cutter grinding shop.
The only real issue you may have is that the gap may be set too
wide. Cut some 24-26 gauge silver. If the edge of the cut burrs down
into the cut, the gap is probably set too wide.
(Steel needs a wider gap than silver, and heavier gauges need wider
gaps as well. Since the thing probably came out of a steel fab shop,
it’s probably set for heavy(ish) steel. Thus.)
You’ll need feeler gauges to get down in-between the blades (when
they’re down) to figure out what the current gap is. I can’t really
advise you on what’s “right"because it depends on what you’re
cutting, and I haven’t ever had to fuss with any of my DiAcros. But
the first step (if that’s an issue) is to figure out where you are,
and then try to figure out where you need to be. Don’t let the
blades actually touch, or grind past each other. I’d guess.002
or.003” would be the minimum gap I’d feel comfortable with. If you
really have trouble, I’ll go gauge mine, and let you know what it
is. Don’t go into it assuming it’s a problem. It may well not be.
I’ve bought 3 of them over the years, and never needed to change
anything. Do look at the blades to see if they’re nicked, (fixible)
or if they’ve got a chunk out of them. (replace) The ruler for the
’right angle’ guide may be out of square, or missing. No big deal
either way. Easily fixed. The safety clamp may be missing, which may
or may not concern you.
It gets in the way, and makes it really hard to see where
you’recutting. On the other hand, it does clamp the metal to the bed
during the cut, keeping it from slipping around, which is a good
thing. I took mine off, but it’s a personal preference thing, unless
the OSHA guys see it. Also it may (or may not) have the back fence
for setting depth on repeat cuts.
Not a critical thing for a jeweler, but nice to have.
Hope this helps