On 2011-11-19, Gunner Asch wrote:
On Sat, 19 Nov 2011 11:18:06 -0500, tnik wrote:
Does anyone know of a company that makes these anymore? Starrett
doesn't, and sometimes the boss just is animate at buying something new..
http://www.ebay.com/itm/320796770446
Thanks
Tom
What are they used for?
Im feeling rather embaressed that I dont know.
They're used in a shaper vise most often. Start with a pair of
parallels, then modify them as follows (end view) -- view with a fixed
pitch font like Courier:
+--------\
\ \__________________________________
\ __________________________________
\ /
+-----/
Place them at the bottom of the vise, with the angled thick ends against
the jaws, and the sharp small ends against a not very thick workpiece.
The sharp ends will dig into the edges of the workpiece, and the angle
at the thick ends will cause the sharp ends to force the workpiece
against the bottom of the vise.
The shape above is not quite right, but within the limits of
hand drawn ASCII graphics. The bottom of the thick end should taper up
towards the sharp end so the sharp end will rest down at the surface of
the vise bottom.
I've got one small set (by Starrett) -- about the right size for
my 7" shaper. Don't need them too often, but when i do, they are the
best thing around.
If you don't have a shaper, they are probably not much use other
than as collectors items. The grip is not strong enough for a
horizontal spindle milling machine taking a good bite. It might work
with a vertical spindle and a *sharp* end mill taking a very shallow cut,
though I have not tried that. The reason that Starrett no longer makes
them is because nobody makes and uses serious shapers in this country
any more.
You could make your own with some care -- but you need to
properly harden them -- at least the angled back and the sharp edge. If
the OP's boss *really* wants more than one set from eBay -- get a set
from eBay and study that for the details of the shape, them make his own
to whatever size he wants.
Good Luck,
DoN.
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