[spaco]

Okay, I give up! 20 or 30 years ago I built a boring bar holder for my
Atlas Lathe from plans that I thought had been around for decades. I
want to pass them on to a friend, but I cant' find them!!!! believe me,
I TRIED!

This is a cylindrical toolpost that replaces the lantern style tool
holder that came with the lathe. The central clamp "Bolt" that squeezes
the two halves of the "clamp" around the boring bar is drilled through
its side to allow the boring bar to fit right through it. This
particular model has three holes in the clamps to accept 1/4", 3/8" and
1/2" boring bars.

I did find a similar plan on the web someplace, but it only has one hole
in its side---- for a 1/2" bar, I think.

Yah, I know, why not just scale the needed dimensions and add them to
the existing plans. No, that plan is somewhat more complicated and
besides, I now obsessed with the need for that VERY plan,

If someone has it, or reference to it, I'd appreciate that info. I just
spent about an hour at the drop box and I can't find it there, either.

----The NEAT thing about this style of boring bar holder is that it is
probably the stiffest possible way to hold a boring bar that there is.


If my arm is twisted hard enough, I suppose I could draw it up and/or
add a couple of pix of it to the drop box.

Pete Stanaitis

[Bob Engelhardt]

spaco wrote:
... I suppose I could draw it up ...

Then you would have, what, ... the PLANS!

Sounds like a plan,
Bob

[Tove Momerathsson[_2_]]

spaco wrote:
Okay, I give up! 20 or 30 years ago I built a boring bar holder for my
Atlas Lathe from plans that I thought had been around for decades. I
want to pass them on to a friend, but I cant' find them!!!! believe me,
I TRIED!

This is a cylindrical toolpost that replaces the lantern style tool
holder that came with the lathe. The central clamp "Bolt" that squeezes
the two halves of the "clamp" around the boring bar is drilled through
its side to allow the boring bar to fit right through it. This
particular model has three holes in the clamps to accept 1/4", 3/8" and
1/2" boring bars.

I did find a similar plan on the web someplace, but it only has one hole
in its side---- for a 1/2" bar, I think.

Yah, I know, why not just scale the needed dimensions and add them to
the existing plans. No, that plan is somewhat more complicated and
besides, I now obsessed with the need for that VERY plan,

If someone has it, or reference to it, I'd appreciate that info. I just
spent about an hour at the drop box and I can't find it there, either.

----The NEAT thing about this style of boring bar holder is that it is
probably the stiffest possible way to hold a boring bar that there is.


If my arm is twisted hard enough, I suppose I could draw it up and/or
add a couple of pix of it to the drop box.

Pete Stanaitis

I've seen a few plans like that, and by happy accident, one was in the
book "The Shop Wisdom of D E Johnson", titled "A Classic Boring Bar
Holder" that I happened to have out. Given the copyright dates, the
original article is in an issue of - ahem - last century's HSM or PM.

The basics:
(a) A combined centerpost/T-nut that's drilled through larger than the
largest boring bar, in this case 15/16" for a 3/4" bar. The bottom is
turned to fit the T-slot, the center is a hair under 1.36" and the top
is threaded 5/8"-11.
(b) Two cylinders, 2.25" od and a hair over 1.36" id, height equal to
the distance from the top of the compound to the lathe axis. There is
a spring pin keeping the two cylinders in alignment radially.
(c) A top cap, 2.25" od and 3/8" thick, with 1/8" turned down to the
same diameter as the centerpost so it fits inside the upper cylinder,
drilled to clear the 5/8" stud.
(d) Assemble the pieces, align the hole in the centerpost with the
lathe axis, put the appropriate drill in the chuck, then drill and
ream one of the three pairs of holes, being careful not to drill
through the spring pin. Loosen the nut, turn the cylinders but NOT
the centerpost by 120 degrees, and do the second hole. And third.
(e) Separate the cylinders and face 0.020 off the mating surfaces,
so you'll get a better grip on the boring bar when it's clamped.
(f) If all your boring bars use the same size bit and the holes in the
bars are centered, face the top of the upper cylinder to remove half
the thickness of the bit. Normally, the cylinders hold the bar so its
center is on the lathe axis, but when you turn the cylinders over, the
bar is lower and the top of the bit is on the lathe axis.

Tove

[spaco]

See, that's how a newsgroup is supposed to work!
Thank you, Tom. I had googled for hours, but the word "classic" is
what I was missing!!!
It's in HSM M/J, 1983 which is about 2 years before my collection
started. But, for some unknown reason, I have 2 original printed
copies of the specific article in PiM, (it is undated)!!!!
How neat is that????

Pete Stanaitis
---------------------

Tove Momerathsson wrote:

I've seen a few plans like that, and by happy accident, one was in the
book "The Shop Wisdom of D E Johnson", titled "A Classic Boring Bar
Holder" that I happened to have out. Given the copyright dates, the
original article is in an issue of - ahem - last century's HSM or PM.

The basics:
(a) A combined centerpost/T-nut that's drilled through larger than the
largest boring bar, in this case 15/16" for a 3/4" bar. The bottom is
turned to fit the T-slot, the center is a hair under 1.36" and the top
is threaded 5/8"-11.
(b) Two cylinders, 2.25" od and a hair over 1.36" id, height equal to
the distance from the top of the compound to the lathe axis. There is
a spring pin keeping the two cylinders in alignment radially.
(c) A top cap, 2.25" od and 3/8" thick, with 1/8" turned down to the
same diameter as the centerpost so it fits inside the upper cylinder,
drilled to clear the 5/8" stud.
(d) Assemble the pieces, align the hole in the centerpost with the
lathe axis, put the appropriate drill in the chuck, then drill and
ream one of the three pairs of holes, being careful not to drill
through the spring pin. Loosen the nut, turn the cylinders but NOT
the centerpost by 120 degrees, and do the second hole. And third.
(e) Separate the cylinders and face 0.020 off the mating surfaces,
so you'll get a better grip on the boring bar when it's clamped.
(f) If all your boring bars use the same size bit and the holes in the
bars are centered, face the top of the upper cylinder to remove half
the thickness of the bit. Normally, the cylinders hold the bar so its
center is on the lathe axis, but when you turn the cylinders over, the
bar is lower and the top of the bit is on the lathe axis.

Tove

[T.Alan Kraus]

Tove Momerathsson wrote:
spaco wrote:

Okay, I give up! 20 or 30 years ago I built a boring bar holder for
my Atlas Lathe from plans that I thought had been around for decades.
I want to pass them on to a friend, but I cant' find them!!!! believe
me, I TRIED!

This is a cylindrical toolpost that replaces the lantern style tool
holder that came with the lathe. The central clamp "Bolt" that
squeezes the two halves of the "clamp" around the boring bar is
drilled through its side to allow the boring bar to fit right through
it. This particular model has three holes in the clamps to accept
1/4", 3/8" and 1/2" boring bars.

I did find a similar plan on the web someplace, but it only has one
hole in its side---- for a 1/2" bar, I think.

Yah, I know, why not just scale the needed dimensions and add them to
the existing plans. No, that plan is somewhat more complicated and
besides, I now obsessed with the need for that VERY plan,

If someone has it, or reference to it, I'd appreciate that info. I
just spent about an hour at the drop box and I can't find it there,
either.

----The NEAT thing about this style of boring bar holder is that it is
probably the stiffest possible way to hold a boring bar that there is.


If my arm is twisted hard enough, I suppose I could draw it up and/or
add a couple of pix of it to the drop box.

Pete Stanaitis


I've seen a few plans like that, and by happy accident, one was in the
book "The Shop Wisdom of D E Johnson", titled "A Classic Boring Bar
Holder" that I happened to have out. Given the copyright dates, the
original article is in an issue of - ahem - last century's HSM or PM.

The basics:
(a) A combined centerpost/T-nut that's drilled through larger than the
largest boring bar, in this case 15/16" for a 3/4" bar. The bottom is
turned to fit the T-slot, the center is a hair under 1.36" and the top
is threaded 5/8"-11.
(b) Two cylinders, 2.25" od and a hair over 1.36" id, height equal to
the distance from the top of the compound to the lathe axis. There is
a spring pin keeping the two cylinders in alignment radially.
(c) A top cap, 2.25" od and 3/8" thick, with 1/8" turned down to the
same diameter as the centerpost so it fits inside the upper cylinder,
drilled to clear the 5/8" stud.
(d) Assemble the pieces, align the hole in the centerpost with the
lathe axis, put the appropriate drill in the chuck, then drill and
ream one of the three pairs of holes, being careful not to drill
through the spring pin. Loosen the nut, turn the cylinders but NOT
the centerpost by 120 degrees, and do the second hole. And third.
(e) Separate the cylinders and face 0.020 off the mating surfaces,
so you'll get a better grip on the boring bar when it's clamped.
(f) If all your boring bars use the same size bit and the holes in the
bars are centered, face the top of the upper cylinder to remove half
the thickness of the bit. Normally, the cylinders hold the bar so its
center is on the lathe axis, but when you turn the cylinders over, the
bar is lower and the top of the bit is on the lathe axis.

Tove



Sounds like an Armstrong boring bar holder.
cheers
T.Alan

[David R.Birch]

spaco wrote:
See, that's how a newsgroup is supposed to work! Thank you, Tom.
I had googled for hours, but the word "classic" is what I was
missing!!! It's in HSM M/J, 1983 which is about 2 years before my
collection started. But, for some unknown reason, I have 2
original printed copies of the specific article in PiM, (it is
undated)!!!! How neat is that????

Pete Stanaitis

PM used to send a reprint of that article in subscription offers, I
got 3 or 4 because of my HSM subscription. I finally got them to stop
sending them by getting a subscription to PiM...

David

[DoN. Nichols]

On 2008-12-14, T.Alan Kraus wrote:
Tove Momerathsson wrote:
spaco wrote:

Okay, I give up! 20 or 30 years ago I built a boring bar holder for
my Atlas Lathe from plans that I thought had been around for decades.
I want to pass them on to a friend, but I cant' find them!!!! believe
me, I TRIED!

This is a cylindrical toolpost that replaces the lantern style tool
holder that came with the lathe. The central clamp "Bolt" that
squeezes the two halves of the "clamp" around the boring bar is
drilled through its side to allow the boring bar to fit right through
it. This particular model has three holes in the clamps to accept
1/4", 3/8" and 1/2" boring bars.

I did find a similar plan on the web someplace, but it only has one
hole in its side---- for a 1/2" bar, I think.

[ ... ]

If someone has it, or reference to it, I'd appreciate that info. I
just spent about an hour at the drop box and I can't find it there,
either.

I've seen the design in a book of projects for the apprentice,
reprinted by whoever it is who reprints out-of-copyright metalworking
books. (Old-Timer's disease is keeping me from remembering the name.)

Enjoy,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

[F. George McDuffee]

On 15 Dec 2008 02:10:36 GMT, "DoN. Nichols"
wrote:
snip
I've seen the design in a book of projects for the apprentice,
reprinted by whoever it is who reprints out-of-copyright metalworking
books. (Old-Timer's disease is keeping me from remembering the name.)
snip
Most likely http://www.lindsaybks.com/
http://www.lindsaybks.com/prod/sub/machine.html

I have been pleased with their service and books.


Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?

Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).

[DoN. Nichols]

On 2008-12-15, F George McDuffee wrote:
On 15 Dec 2008 02:10:36 GMT, "DoN. Nichols"
wrote:
snip
I've seen the design in a book of projects for the apprentice,
reprinted by whoever it is who reprints out-of-copyright metalworking
books. (Old-Timer's disease is keeping me from remembering the name.)
snip
Most likely http://www.lindsaybks.com/
http://www.lindsaybks.com/prod/sub/machine.html

That is the name which I was trying to remember.

I'm now wandering through the list of books trying to find the
one in question. I *think* that it is:

South Bend Lathe Works's
Machine Shop Projects

http://www.lindsaybks.com/bks4/sblpro/index.html

but I'm not sure. It is a pity that they don't show the cover, which
would be more likely to trigger my memory.

They say:

"Projects include: lathe mandrel, lathe centers, spur center, 1"
bolt and nut, screw drive, machinist's clamp, clamp lathe dog,
boring bar for lathe, milling arbor for lathe, surface gauge,
small bench vise, adjustable tap wrench, 6" improved water
motor, arbor press, hand power emery grinder, and more."

so the question is whether the "boring bar for lathe" project includes
the holder in question.

Of course, they drop books from their list as they add others,
so who knows whether the one which I remember is still there. (Now if I
just knew where my copy submerged. :-)

Enjoy,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

[F. George McDuffee]

On 16 Dec 2008 01:37:13 GMT, "DoN. Nichols"
wrote:

On 2008-12-15, F George McDuffee wrote:
On 15 Dec 2008 02:10:36 GMT, "DoN. Nichols"
wrote:
snip
I've seen the design in a book of projects for the apprentice,
reprinted by whoever it is who reprints out-of-copyright metalworking
books. (Old-Timer's disease is keeping me from remembering the name.)
snip
Most likely http://www.lindsaybks.com/
http://www.lindsaybks.com/prod/sub/machine.html

That is the name which I was trying to remember.

I'm now wandering through the list of books trying to find the
one in question. I *think* that it is:

South Bend Lathe Works's
Machine Shop Projects

http://www.lindsaybks.com/bks4/sblpro/index.html

but I'm not sure. It is a pity that they don't show the cover, which
would be more likely to trigger my memory.

They say:

"Projects include: lathe mandrel, lathe centers, spur center, 1"
bolt and nut, screw drive, machinist's clamp, clamp lathe dog,
boring bar for lathe, milling arbor for lathe, surface gauge,
small bench vise, adjustable tap wrench, 6" improved water
motor, arbor press, hand power emery grinder, and more."

so the question is whether the "boring bar for lathe" project includes
the holder in question.

Of course, they drop books from their list as they add others,
so who knows whether the one which I remember is still there. (Now if I
just knew where my copy submerged. :-)

Enjoy,
DoN.
==============
The boring bar on page 40 is the between centers type for line
boring with the part bolted to the cross slide.

If you are looking for what most people think of as a boring bar
and holder see Milne's "Machine Shop Methods" p 212-213 for the
holder and p 211-212 for the bar. Book available from Lindseys
ISBN 1-55918-223-7 their sku No. 22237 ... $18.95
http://lindsaybks.com/bks/milne/index.html


Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?

Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).