I bought a very tiny indexable boring bar at one of the shows. It had a 3/16" shank and a tiny triangular insert. Once I understood how to set and use it it was very good, but I overdrove it and broke the end off :-/

Neil, I'v made a bar about that size, for a carbide tip I used a carbide tip from a circular saw blade brazed on the end of a bar made from a bit of steel that was a bit stiffer than a plain mild steel. Same system works OK for normal lathe tools. Ian S C

Harbor Freight

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I have the world's ugliest boring bar made from a bent old HSS drill and it does the same jobs, but less elegantly! Thing is I have a nice QCTP holder with a 3/16" hole in it… so maybe make a new one from HSS.

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I realise this thread is a bit cold now but I had a trade flier through this week offering ISO mini boring bar sets down to 5.5mm dia (with through coolant) but they wanted £178 on offer +vat.

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Sorry I cannot help you find a supplier, I'm presuming you have tried all the usual suspects without success. My smallest one is 8mm Diameter (Iscar, I think) which is positively huge compared with your 5mm one.

As you already have a holder for round shank boring tools Neil you may find the following of interest, as may others, as it deals with shaping and sharpening very small boring tools having round shanks.

Perhaps you can look up the show website and if it has a list of exhibitors then check their websites. Or was it a few years ago?

Sorry..but at first post didn’t get what you needed..and for a change wanted to not advertise my lack of understanding. ..what do you need..torx screw ..insert …boring bar of tiny E clip?

You could try brazing either a chip off an old tool, or find an old carbide tip circular saw blade onto your old tool, might be worth trying. Ian S C

Home › Forums › Workshop Tools and Tooling › Tiny Boring Bar This topic has 21 replies, 16 voices, and was last updated 16 June 2013 at 17:53 by Sub Mandrel. Viewing 22 posts - 1 through 22 (of 22 total) Author Posts 2 June 2013 at 22:07 #17095 Sub MandrelParticipant @submandrel Source? Advert 2 June 2013 at 22:07 #121346 Sub MandrelParticipant @submandrel I bought a very tiny indexable boring bar at one of the shows. It had a 3/16" shank and a tiny triangular insert. Once I understood how to set and use it it was very good, but I overdrove it and broke the end off :-/ Has anyone any idea where I could get one? Thanks Neil 5 June 2013 at 20:05 #121619 Sub MandrelParticipant @submandrel Has no-one got any ideas…? Neil 5 June 2013 at 20:13 #121620 NJHParticipant @njh Don't get excited now Neil – I'm often clueless- but surely a man of your experience wouldn't find making a replacement too arduous? Norman 5 June 2013 at 20:35 #121623 jason udallParticipant @jasonudall57142 Sorry..but at first post didn’t get what you needed..and for a change wanted to not advertise my lack of understanding. ..what do you need..torx screw ..insert …boring bar of tiny E clip? 5 June 2013 at 20:55 #121625 Ian PParticipant @ianp Neil Did you take the picture before you broke it, or is the damage not visible? Sorry I cannot help you find a supplier, I'm presuming you have tried all the usual suspects without success. My smallest one is 8mm Diameter (Iscar, I think) which is positively huge compared with your 5mm one. What size tips does it take? Ian P

Russell supply

Elsewhere I spotted **LINK** The lower example on that page is also down to 5.5mm dia. and on other pages they offer inserts too. The price is a bit more reasonable but more than I would spend.

Some years ago I made a set of small boring bars and holders from a casting kit Here they hold the small bars very firmly and which helps stop flexing which can cause the breakage of tips, I'm sure they could be adapted to be used with the small indexed tipped bars now available.

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Can't remember what for, but I did grind a piece of 1/8 HSS for use as a tiny boring bar. Obviously, you can't one a foot long at that cross section

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I've made a couple of mini boring bars from old broken taps, centre drill, & picked up a couple of Carbide borers from CNC machines (centre cooling) from somewhere many moons ago..

.. broken tap & centre drill boring bars, the one in the holder is 1/4" carbide, the bottom right is also carbide.. tip dia 0.114". hopefully you can make them out..seem to have forgotton how to set macro on camera.(.it's there somewhere but couldn't find it on menu)?..  so don't dispair you can always make a boring bar out of something.

Thanks everyone. the original bar went ping at the screwhole and the tip flew away and was never seen again, so no way to measure it

Don't get excited now Neil – I'm often clueless- but surely a man of your experience wouldn't find making a replacement too arduous?