holding one of these cutters in hand; I don't see how it would work
the angles are wrong, and the shown holder would have to have a shim
to get the
relief needed for threads.
see United States Patent 3999265
the one I'm holding, 3" dia, .090" width cut, .3" max depth of cut
with .2" max cut
before the 45 degree chamfer starts cutting, is a full round disk with
a slot ground
into it to provide a cutting edge, has a threaded center hole for
mounting, looks to be tool steel, machined, hardened and ground
used it on a B&S screw machine - cuts off the part and provides
chamfer to next part on one op
I've never seen a threader like this, but I can see how a few angles
in the one shown and a cutter with the right profile it would be a
I am convinced by responses on practicalmachinist, that this is a
circular form tool. It it basically a cutter that cuts profile on its
edge. When it becomes dull, a little bit is ground off from it to
expose new surface.
On Jan 31, 8:56 pm, Ignoramus14657 <ignoramus14...@NOSPAM.
Like so many things mechanical, it's a mystery to me, too.
If the talent here doesn't offer a good explanation, you might
follow up by hawking it on ebay, set the shipping cost
high-ish. If you get a buyer, ask HIM/HER what it is.
The "wheel" part is a threading cutter. It is resharpened by
grinding back along a radial line, loosening the big nut, and rotating it
to restore the radial line to center with the spindle axis prior to
re-tightening the big nut.
I'm not sure what kind of toolpost it mounts on, but certainly
not on the edge of the bed as you have it shown.
I'm not sure what the other bright metal piece is for -- but at
a guess, it is an extra cutting edge to bevel the end of the workpiece
so you can do two parts of the task with a single tool
It would be interesting to see what it was actually supposed to
mount on. Obviously, not the piston style quick-change toolpost which
the machine currently has mounted.
It might be for mounting on a turret tool -- but that would
require a power feed for the turret, not the bolt-on bed turret that my
Clausing has. For my turret, the proper tool for threading is a
Geometric die head -- or one of the similar ones from other makers.
Email: < firstname.lastname@example.org> | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.