What do you call these mini boring bars ?

[edholly]

I was given these by a mate - and they have been incredibly useful for my model engine making.

There were quite a few in the tin and I don't think I will need anymore - they range from those that can bore a hole just bigger than an 1/8th of an inch to internal threading down to around 1/4 inch.

I guess a lot of guys like me never knew these existed, but I can tell you they are invaluable when making small and not so small internal cuts and threads. The metal is as good as a HSS as you wil find, and most of them are embossed SWISS.

Would like to know what they are named and if you can still buy them. I highly recomend to anyone needing to do small internal work.

Ed

 

[ruzzie]

I have quite a few of these bars in various styles that I acquired when I operated a society genovese jig borer. They only markings they had was a number and symbol relating to it size and style.
I haven't found a supplier of them but being swiss they won't be cheap.

 

[toolznthings]

Hi,
I believe they are Bokem boring bars or at least their style.

Brian

 

[deverett]

Back in the 1980s/90s, there was a company by the name of Stanton-Thompson Ltd of Watlington, Oxon that advertised Orkan specialist boring tools.

The tools were described by S-T as "boring, facing and bottoming, threading and recessing operations in bores as small as 1/8 are simplified by the range of Orkan tools distributed by this company. Made from HSS and ground right round for extended life and easy re-sharpening, there are 13 sizes standard and extra length cutting head diameters from 1/8 - 5/8 inch."

The bottom tool in your pictures looks exactly like one of the range of Orkan boring tools. The Orkan company now goes by the name of Hufnagel and if you look at Newman tools http://www.newmantools.com/huf.htm , your tool appears to be designated as a roughing tool.
Stanton_Thompson is still in business as a precision engineering company, same address.

Dave
The Emerald Isle