I was unclear about the triangular inserts for the Everede boring
bar; they are like little tool bits, about 3/8 long with a triangular
cross section, 3/32 across the flats, with one point of the triangle
truncated slightly. Strange little guys, nothing like the typical
carbide triangular inserts. Everede has a site but I couldn't find
the inserts there; apparently, they began making these tool steel
inserts in the 1930's.
John
--- In 7x12minilathe@..., George Kaplan <kgmk99@y...>
wrote:
the The Little Machine Shop for the inserts
GK
--- John <moran03@e...> wrote:
I recently bought a boring head on eBay which
happened to include an
Everede boring bar. This bar uses replaceable 3/32"
triangular
inserts which seem to be tool steel. I touched up
the included
insert and found that it produces a much better
finish than the
brazed carbide bars I've been using.
Are these little triangular inserts available and if
so, where?
Carbide tip tools (regular tools and boring
bars)don't produce a good
finish for me. They also seem to develop tiny chips
on the cutting
point fairly quickly (which may be why the finish is
poor) and I've
also had larger chips a couple of times. I've read
that carbide
works best when taking heavy cuts and that light
cuts (which is my
normal use) don't work as well because the thin chip
applies force
close to the edge. I've also had poor results when
re-sharpening
carbide -- the edge seems more fragile afterwards
and rapidly
develops chips while turning mild steel; the finish
is so poor that I
try not to use carbide on aluminum.
Based on the above, I'm shifting to cobalt steel
bits but would be
interested to find out if there is some error I'm
making in the way I
use carbide tools or if others run into the same
problem using them
on minilathes?
John
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