In article , dnichols@d-
and-d.com says...
In article ,
Ned Simmons wrote:
In article , dnichols@d-
and-d.com says...
In article .com,
himog wrote:
Grant Erwin:
Many many boring bars have square holes, one at 90° and one at 45°.-


None of the boring bars I have seen have holes in them for holding
cutters.

I think that you are confusing two things with the same name.

There are boring bars made to mount in boring/facing heads, and
I have never seen one of those with sockets for HSS tool bit. (Square
holes.)


Bridgeport boring heads came with this sort of bar, for
example...

http://www.hilcoind.com/flyers/Burnes/Catalog/21.JPG

O.K. Nicely offset so the cutting edge is on the centerline.

But still -- a square *slot*, not a square *hole* in this case.



Not the one that looks like a fly cutter, the one closest
to the boring head in the lower row, and at least one of
the two in the upper row have square broached thru holes.
Here's slightly better photo.

http://i24.ebayimg.com/01/i/04/a7/57/16_1_b.JPG

Ned Simmons