What are these boring tools?

[Timleech]

I got several of these along with a boring head the other day, I've not seen this type before. Are they just generic blanks, or made for a special purpose?
The spiral form at the end means that clearances are maintained automatically when resharpened, which is neat.
They're marked 'Stanton-Thompson', who seem to be a UK tool agent, & 'Made in Germany' along with some reference numbers.

http://web.onetel.com/~duttondock/Pi...ringtool-1.jpg
http://web.onetel.com/~duttondock/Pi...ringtool-2.jpg
http://web.onetel.com/~duttondock/Pi...ringtool-3.jpg

Tim.

[SGW]

Travers Tool www.travers.com sells, or at least sold, that style of boring tool. I imagine they still do.

[DR]

They look like Bokum bars.

http://www.bokumtoolco.com/prod01.htm

Not the greatest boring bars in the world, but they do have a long life because of the easy re-sharpening.

Years ago I got an assortment of new Bokum bars out of the garbage can at an auction. The auction setup man found them in a drawer, not knowing what they were he threw them in the nearest garbage can.

[wierdscience]

Those work pretty good,I like the "True-form"threading bars made along those same lines.You never have to alter or grind the angles,just the top,great for small hole threading.

[dicks42000]

Hey, those look like the same design boring bars that came with my Narex adjustable boring & facing head.
Yes, they are easy to re-sharpen and I use them in the small Atlas lathe sometimes too.