looking for a left hand boring bar; C6 or m42 tip , small radius
cutting edge is acceptable. Anybody got a lead on where I can buy one
of these?

Thanks
Mike
Will be in LV for Christmas (steve?)

"mikec" wrote in message
...
looking for a left hand boring bar; C6 or m42 tip , small radius
cutting edge is acceptable. Anybody got a lead on where I can buy one
of these?

Thanks
Mike
Will be in LV for Christmas (steve?)

Why? Explain the job and you might get a better idea how to do it.

looking for a left hand boring bar; C6 or m42 tip , small radius
cutting edge is acceptable. Anybody got a lead on where I can buy one
of these?
....
Why? Explain the job and you might get a better idea how to do it.

The only thing i could think of is left hand inside threading, but he's not
looking for a thread tool. But it got me thinking, I don't know how to cut a
left hand thread on my manual lathe anyway. How is this done?

The only thing i could think of is left hand inside threading, but he's not
looking for a thread tool.

Boring a hole with a bridgeport in back gear? Except you can reverse
the rotation on the motor. Double chuck CNC lathe, and he needs
tooling for the finish operations in the 2nd chuck?

But it got me thinking, I don't know how to cut a
left hand thread on my manual lathe anyway. How is this done?

Simply put, spindle running forwards, thread away from the headstock;
or thread towards the headstock with the spindle in reverse. Note
that you'll have to change the relief on the cutting tool to
compensate.
--Glenn Lyford

Glenn Lyford fired this volley in news:2d4c9153-9414-
:

Note
that you'll have to change the relief on the cutting tool to
compensate.


yeah... quite some large amount, too, if you're running in reverse...
almost like running the tool upside-down. (no... wait... it IS upside-
down!) G

LLoyd

On Thu, 17 Dec 2009 05:46:13 -0600, "Karl Townsend"
wrote:



looking for a left hand boring bar; C6 or m42 tip , small radius
cutting edge is acceptable. Anybody got a lead on where I can buy one
of these?
...
Why? Explain the job and you might get a better idea how to do it.

The only thing i could think of is left hand inside threading, but he's not
looking for a thread tool. But it got me thinking, I don't know how to cut a
left hand thread on my manual lathe anyway. How is this done?



You'll need one if you put it in the side hole of a boring head :-)


Mark Rand
RTFM

On Dec 17, 10:28*am, Mark Rand wrote:
On Thu, 17 Dec 2009 05:46:13 -0600, "Karl Townsend"

wrote:

looking for a left hand boring bar; C6 or m42 tip , small radius
cutting edge is acceptable. Anybody got a lead on where I can buy one
of these?
...
Why? *Explain the job and you might get a better idea how to do it.

The only thing i could think of is left hand inside threading, but he's not
looking for a thread tool. But it got me thinking, I don't know how to cut a
left hand thread on my manual lathe anyway. How is this done?

You'll need one if you put it in the side hole of a boring head :-)

Mark Rand
RTFM

EXACTLY!!! That is what I'm doing.......very large hole.

Note: E-mailed *and* posted.

In article ,
mikec wrote:
:On Dec 17, 10:28=A0am, Mark Rand wrote:
: On Thu, 17 Dec 2009 05:46:13 -0600, "Karl Townsend"
:
: wrote:
:
: looking for a left hand boring bar; C6 or m42 tip , small radius
: cutting edge is acceptable. Anybody got a lead on where I can buy one
: of these?
: ...
: Why? =A0Explain the job and you might get a better idea how to do it.
:
: The only thing i could think of is left hand inside threading, but he's =
:not
: looking for a thread tool. But it got me thinking, I don't know how to c=
:ut a
: left hand thread on my manual lathe anyway. How is this done?
:
: You'll need one if you put it in the side hole of a boring head :-)
:
: Mark Rand
: RTFM
:
:EXACTLY!!! That is what I'm doing.......very large hole.

Your mill can't run its spindle in reverse?????????????

--
Bob Nichols AT comcast.net I am "RNichols42"

Robert Nichols wrote:
Note: E-mailed *and* posted.

In article ,
mikec wrote:
:On Dec 17, 10:28=A0am, Mark Rand wrote:
: On Thu, 17 Dec 2009 05:46:13 -0600, "Karl Townsend"
:
: wrote:
:
: looking for a left hand boring bar; C6 or m42 tip , small radius
: cutting edge is acceptable. Anybody got a lead on where I can buy one
: of these?
: ...
: Why? =A0Explain the job and you might get a better idea how to do it.
:
: The only thing i could think of is left hand inside threading, but he's =
:not
: looking for a thread tool. But it got me thinking, I don't know how to c=
:ut a
: left hand thread on my manual lathe anyway. How is this done?
:
: You'll need one if you put it in the side hole of a boring head :-)
:
: Mark Rand
: RTFM
:
:EXACTLY!!! That is what I'm doing.......very large hole.

Your mill can't run its spindle in reverse?????????????


Many of the boring heads use a threaded fitment to the arbor so you
can't run them in reverse unless you take special precautions to stop
them coming undone.

"mikec" wrote in message
...
On Dec 17, 10:28 am, Mark Rand wrote:
On Thu, 17 Dec 2009 05:46:13 -0600, "Karl Townsend"

wrote:

looking for a left hand boring bar; C6 or m42 tip , small radius
cutting edge is acceptable. Anybody got a lead on where I can buy one
of these?
...
Why? Explain the job and you might get a better idea how to do it.

The only thing i could think of is left hand inside threading, but he's
not
looking for a thread tool. But it got me thinking, I don't know how to
cut a
left hand thread on my manual lathe anyway. How is this done?

You'll need one if you put it in the side hole of a boring head :-)

Mark Rand
RTFM

EXACTLY!!! That is what I'm doing.......very large hole.

We never had any of them fancy "Store-Bought" tools when I was young. We
made boring bars by drilling a hole in a steel bar. I have some that the
hole is drilled at a 45 deg angle and some perpendicular. A HHS tool bit
fits in the hole and is held with a set screw.

In article ,
David Billington wrote:
:Robert Nichols wrote:
:
: Your mill can't run its spindle in reverse?????????????
:
:
:Many of the boring heads use a threaded fitment to the arbor so you
:can't run them in reverse unless you take special precautions to stop
:them coming undone.

Ahh yes, that would be a problem. My boring head has an integral
shank, so I didn't consider that factor.

--
Bob Nichols AT comcast.net I am "RNichols42"

On Dec 19, 7:31*am, Robert Nichols
wrote:
In article ,
David Billington wrote::Robert Nichols wrote:

:
: Your mill can't run its spindle in reverse?????????????
:
: *
:Many of the boring heads use a threaded fitment to the arbor so you
:can't run them in reverse unless you take special precautions to stop
:them coming undone.

Ahh yes, that would be a problem. *My boring head has an integral
shank, so I didn't consider that factor.

--
Bob Nichols * * * * AT comcast.net I am "RNichols42"

So I bought a solid carbide bit....$56 (OUCH!) Should get here monday
via ups.

On Dec 20, 10:29*am, mikec wrote:
On Dec 19, 7:31*am, Robert Nichols
....
:Many of the boring heads use a threaded fitment to the arbor so you
:can't run them in reverse unless you take special precautions to stop
:them coming undone.

It's called "Loctite", works well and releases when heated.
I simply screwed the head on tight. The boring bar will break before
it can apply as much torque as a big wrench

So I bought a solid carbide bit....$56 (OUCH!) Should get here monday
via ups.-

You know, the extra stiffness of solid carbide isn't necessary when
you cut with the end of the bar. A little deflection won't change the
diameter of the hole.

You can regrind the end of a right hand boring bit. The lost shank
clearance generally doesn't matter for the side hole of a boring head.

jsw

On Dec 20, 8:52*am, Jim Wilkins wrote:
On Dec 20, 10:29*am, mikec wrote:

On Dec 19, 7:31*am, Robert Nichols
...
:Many of the boring heads use a threaded fitment to the arbor so you
:can't run them in reverse unless you take special precautions to stop
:them coming undone.

It's called "Loctite", works well and releases when heated.
I simply screwed the head on tight. The boring bar will break before
it can apply as much torque as a big wrench

So I bought a solid carbide bit....$56 (OUCH!) Should get here monday
via ups.-

You know, the extra stiffness of solid carbide isn't necessary when
you cut with the end of the bar. A little deflection won't change the
diameter of the hole.

You can regrind the end of a right hand boring bit. The lost shank
clearance generally doesn't matter for the side hole of a boring head.

jsw



It's called "Loctite", works well and releases when heated.
I simply screwed the head on tight. The boring bar will break before
it can apply as much torque as a big wrench

Maybe I'll try this next time.......don't think I want to take a
chance of breaking my $56 bit!


So I bought a solid carbide bit....$56 (OUCH!) Should get here monday
via ups.-


You know, the extra stiffness of solid carbide isn't necessary when
you cut with the end of the bar. A little deflection won't change the
diameter of the hole.

Not very concerned with that tight of tolerances so not worried about
any deflection but I could not locate a carbide tipped bar....any
suggestions as to where I could get one?

You can regrind the end of a right hand boring bit. The lost shank
clearance generally doesn't matter for the side hole of a boring
head.

How would you do this on a carbide tipped bar? I might think about
trying that next.

Thanks
Mike