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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

Diamond honing after grinding seems to help on the surface finish.

Bill in Boulder "Engineering as an Art Form!"

the The Little Machine Shop for the inserts

GK
--- John <moran03@...> 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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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

__________________________________
Do you Yahoo!?
Yahoo! SiteBuilder - Free, easy-to-use web site design software

--- In 7x12minilathe@..., "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?

Wow! What a coincidence! The Aug/Sept Machinist's Workshop has an
article on building your own boring bar to use the Everede inserts.

The author says that MSC (and others) sell the inserts. He thinks
that "between two and three dollars each" is expensive but they last
a long time.

I haven't looked them up in "The Big Book" yet, but will try first
in the boring bar section. (Does MSC list manufacturers in the index?
I know KBC does...)

Hope that helps,
RA

Hi Richard,

Thanks for the info. I couldn't find the inserts on the Everede site
and thought perhaps they were discontinued. Didn't find them at MSC
but Travers has them for $1.75 or $4.50 for an insert to do
threading. Now I need to figure out the part number for my bar so I
can order the right insert.

John


--- In 7x12minilathe@..., "Richard Albers"
<rralbers@j...> wrote:

--- In 7x12minilathe@..., "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?

Wow! What a coincidence! The Aug/Sept Machinist's Workshop has

an

article on building your own boring bar to use the Everede inserts.

The author says that MSC (and others) sell the inserts. He thinks
that "between two and three dollars each" is expensive but they last
a long time.

I haven't looked them up in "The Big Book" yet, but will try first
in the boring bar section. (Does MSC list manufacturers in the

index?

I know KBC does...)

Hope that helps,
RA

In the same vein I have a tool system made by the J.D.G. Tool Company of
Brooklyn N.Y. Rather small, it was sold by Edelstaal for their line of
laths. The bit has a "W" cross section with a variety of holders. Can
anyone provide information on this system?

Bill in Boulder "Engineering as an Art Form!"

Greeting John, you may wish to check eBay for some of the inserts.
I've been able to find a fairly large selection of inserts on there
and been successful in bidding on some of them with a net cost of .05
each. Check around for which inserts might be interchangable with
your bar and keep an eye on eBay, you might get lucky! Usually you
can do a search for "Carbide inserts" or "boring bars", etc and it'll
turn up a good list. Some other folks to check with would be JTS
Machinery (800-321-3566, or ) as they have a
pretty decent selection of inserts and the like.

Ed
"Expiring minds want to know!"

--- In 7x12minilathe@..., "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