I've been going through some buckets of tooling I've accumulated, and here are
a couple things I haven't been able to ID:

http://members.aol.com/gto69ra4/Photos/whatsit1.jpg
http://members.aol.com/gto69ra4/Photos/whatsit2.jpg

First one is about 3" long, steel, has rosewood inserts on either side. Two
edges are beveled but not sharp, the other two are flat with a small groove
milled down the middles.

Second is also steel, about 5" long. Some of the holes are threaded, some
aren't. The two tube sections on either end are held on with headless screws
from the other side.

Anyone?

GTO(John)

"GTO69RA4" wrote in message
...
I've been going through some buckets of tooling I've accumulated, and here
are
a couple things I haven't been able to ID:

http://members.aol.com/gto69ra4/Photos/whatsit1.jpg
http://members.aol.com/gto69ra4/Photos/whatsit2.jpg

First one is about 3" long, steel, has rosewood inserts on either side.
Two
edges are beveled but not sharp, the other two are flat with a small
groove
milled down the middles.

Second is also steel, about 5" long. Some of the holes are threaded, some
aren't. The two tube sections on either end are held on with headless
screws
from the other side.

Anyone?

GTO(John)
Second item looks like a sine bar.

Martin

--
martindot herewhybrowat herentlworlddot herecom

On 24 Aug 2004 20:18:10 GMT, (GTO69RA4) wrote:

I've been going through some buckets of tooling I've accumulated, and here are
a couple things I haven't been able to ID:

http://members.aol.com/gto69ra4/Photos/whatsit1.jpg
http://members.aol.com/gto69ra4/Photos/whatsit2.jpg

First one is about 3" long, steel, has rosewood inserts on either side. Two
edges are beveled but not sharp, the other two are flat with a small groove
milled down the middles.

Second is also steel, about 5" long. Some of the holes are threaded, some
aren't. The two tube sections on either end are held on with headless screws
from the other side.

Anyone?

GTO(John)

The first is a square. the rosewood inserts are for insulation purposes to
limit distortion when handling.

The second is a sine bar.

The square can be rescued by grinding/scraping and a lot of work. The sine bar
can probably be rescued by replacing the tube sections with sections from the
same piece of drill rod of an appropriate diameter if there is no corrosion on
the body where the tubular sections met it... probably not worth the effort.


Regards
Mark Rand
RTFM

The first is a square. the rosewood inserts are for insulation purposes to
limit distortion when handling.

The second is a sine bar.

The square can be rescued by grinding/scraping and a lot of work. The sine
bar
can probably be rescued by replacing the tube sections with sections from the
same piece of drill rod of an appropriate diameter if there is no corrosion
on
the body where the tubular sections met it... probably not worth the effort.


Regards
Mark Rand
RTFM

Thanks for the info, I appreciate it. I'm new enough at this that the more
interesting things are still on the foreign side.

The square's really in pretty good shape. The sine block's pretty rough, so
that's probably a loss.

GTO(John)

On 24 Aug 2004 23:07:59 GMT, (GTO69RA4) wrote:

The first is a square. the rosewood inserts are for insulation purposes to
limit distortion when handling.

The second is a sine bar.

The square can be rescued by grinding/scraping and a lot of work. The sine
bar
can probably be rescued by replacing the tube sections with sections from the
same piece of drill rod of an appropriate diameter if there is no corrosion
on
the body where the tubular sections met it... probably not worth the effort.


Regards
Mark Rand
RTFM

Thanks for the info, I appreciate it. I'm new enough at this that the more
interesting things are still on the foreign side.

The square's really in pretty good shape. The sine block's pretty rough, so
that's probably a loss.

GTO(John)


Use the salt and vinegar rust removal trick, and afterwards, stick a
couple gauge blocks under it. do the trig and measure. Ill bet you
dollars to donuts any error will not be of any consideration for
hobby work.

Ive seen many items far worse than this cleaned up and doing good
service.

Hell..if you dont want it, stick it in an padded envelope, and mail it
off to me. Ill pay the shipping. Ive got a sine table, but could use a
bar.

Gunner

Gunner

No 220-pound thug can threaten the well-being or dignity of a 110-pound
woman who has two pounds of iron to even things out. Is that evil?
Is that wrong? People who object to weapons aren't abolishing violence,
they're begging for the rule of brute force, when the biggest, strongest
animals among men were always automatically "right". Guns end that,
and social democracy is a hollow farce without an armed populace to make
it work.
- L. Neil Smith

Hey GTO,

First one looks like a square, and the rosewood is the grip.

The second one is definitely a sine bar. If the sine bar is any good,
it won't be "about 5 inches long", it will be EXACTLY 5 inches from
centre to centre of the "round tubes".

Take care.

Brian Lawson,
Bothwell,,Ontario.
XXXXXXXXXXXXXXXXXXXXX
On 24 Aug 2004 20:18:10 GMT, (GTO69RA4) wrote:

I've been going through some buckets of tooling I've accumulated, and here are
a couple things I haven't been able to ID:

http://members.aol.com/gto69ra4/Photos/whatsit1.jpg
http://members.aol.com/gto69ra4/Photos/whatsit2.jpg

First one is about 3" long, steel, has rosewood inserts on either side. Two
edges are beveled but not sharp, the other two are flat with a small groove
milled down the middles.

Second is also steel, about 5" long. Some of the holes are threaded, some
aren't. The two tube sections on either end are held on with headless screws
from the other side.

Anyone?

GTO(John)

In article ,
GTO69RA4 wrote:
I've been going through some buckets of tooling I've accumulated, and here are
a couple things I haven't been able to ID:

http://members.aol.com/gto69ra4/Photos/whatsit1.jpg
http://members.aol.com/gto69ra4/Photos/whatsit2.jpg

First one is about 3" long, steel, has rosewood inserts on either side. Two
edges are beveled but not sharp, the other two are flat with a small groove
milled down the middles.

Hmm ... this one I'm not sure about, but as a guess, it might be
intended for checking the angle of a dovetail when scraping it. Depends
on what the included angle of the beveled edges is, of course.

Second is also steel, about 5" long. Some of the holes are threaded, some
aren't. The two tube sections on either end are held on with headless screws
from the other side.

However, this one is quite obvious. It *used* to be a sine bar,
but with that rust, especially on the rollers, and probably on the top
surface (not visible in the photo) as well, it is no longer capable of
the accuracy for which it was made.

The rolls should be *precisely* 5.000" apart, and *precisely*
the same diameter. The roll on the lower tight hand end (as
photographed) rests on a surface plate, and the one on the upper left
end rests on a stack of gauge blocks built up with the help of a sine
table and the knowledge that the centers are 5" apart. (Multiply the
sine of the desired angle by 5, and build a stack of gauge blocks
precisely that high to generate the desired angle. The threaded holes
are for attaching extra fixtures to the bar, for holding the workpiece,
perhaps for use in a surface grinder or something similar.

Now to see what others have said.

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 ---

On Tue, 24 Aug 2004 18:28:42 -0500, Jim wrote:

In article ,
says...
The first is a square. the rosewood inserts are for insulation purposes to
limit distortion when handling.

Mark, what is a square like this one used for? I understand
insulating micrometers etc, but this?
Really curious!

Jim Kovar
Vulcan, Mi

The only use I know of is checking things on a surface plate with a light and
an eyeball or a pair of feelers. I'm not convinced that the rosewood would do
any good (although it looks nice :-)


Mark Rand
RTFM