As I recall..and I may well be wrong.....
They are the replacement ends for a larger group of units, boring bars,
boring heads and so forth.
They were commonly used in automated machining as "quick replacement"
heads. If you busted an insert..you simply replaced it with another very
quickly. The advantage was that each was exactly the same size as the
privious unit, so didnt need to retouch your tooling offsets
I think you could make the other side just fine. You have the machines.
I guess the idea is if the insert blows out and you catch it in time you can
bar with a new head. Usually the insert blows out, the machine is too dumb (no
monitoring) and the head is chewed up and the bar is bent or broken. Operator
near to hit the stop button. But that is where I work.
Now I supose you could have a lh and rh head and use it on the same bar shank
but how much
does that really save? I don't get it.
Ayup. Simply turn, then thread a proper bit of rod and screw on the
head. Doesnt even need to be hollow if you are not going to be pumping
coolant up the bar.
You did good. Get anymore like that and drop me an email. Id sure make
them and Id pump coolant up them.
Hmm ... they look like screw-on insert heads for boring bars to
Ones designed to bore to the bottom of a blind hole, if you have
CNC or some other way to reliably stop the travel at the same point
Looks as though you have at least three sizes there --
determined by the offset from the shank which would be a continuation of
the cylindrical part.
Perhaps the hole is designed for flowing coolant through a
hollow boring bar and to the insert.
Any clue what thread is in the cylindrical end?
I would kind of like having those. They look a reasonable size
for my 12x24" lathe.
O.K. For boring head use, not lathe use, and the expensive
parts are not with the insert heads. (Things like the BT-40 holder, the
boring head, and the (less expensive) collection of shanks.. But they
could be used in a standard boring head or a lathe as well with a bit of
creative part making.