Tiny Boring Bar

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Tiny Boring Bar

This topic has 21 replies, 16 voices, and was last updated 16 June 2013 at 17:53 by Sub Mandrel.

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2 June 2013 at 22:07 #17095
Sub Mandrel
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@submandrel
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2 June 2013 at 22:07 #121346
Sub Mandrel
Participant
@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 Mandrel
Participant
@submandrel
Has no-one got any ideas…?

Neil
5 June 2013 at 20:13 #121620
NJH
Participant
@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 udall
Participant
@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 P
Participant
@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
5 June 2013 at 22:19 #121629
Bazyle
Participant
@bazyle
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?

This any good?
5 June 2013 at 22:47 #121630
S.D.L.
Participant
@s-d-l
Assuming the insert is broken. What is the length of the triangle in mm?

Steve
5 June 2013 at 23:20 #121634
MadMike
Participant
@madmike
RDG offer a 6mm dia shank indexable tip boring bar. Simply turn the shank down to 3/16 dia if it is critical. HTH.
6 June 2013 at 08:33 #121646
MichaelR
Participant
@michaelr
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.
6 June 2013 at 09:12 #121649
methusala
Participant
@methusala
Hi Neil,

Have you tried j.b. cutting tools., I bought some small i.e. .110 dia shank and.156 to tool tip

boring bars from them in the past. you would have to make a special holder for them as

they have a near eliptical shaped end on them. Total lenght of bar is just over 1.125

with the working lenght being .625.

Edited By methusala on 06/06/2013 09:16:35
6 June 2013 at 10:09 #121654
speelwerk
Participant
@speelwerk
There is no price mentioned so will not be cheap, Niko **LINK**
6 June 2013 at 21:09 #121706
Sub Mandrel
Participant
@submandrel
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

It was about 5mm on each side, at a guess. The screw was tiny.

I'm sure it was only about £4 at an MMEX one year.

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.

Neil
7 June 2013 at 14:11 #121784
Ian S C
Participant
@iansc
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
7 June 2013 at 14:43 #121789
Harold Hall 1
Participant
@haroldhall1
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.

**LINK**

Will not though be able to comment further as I will be away from the PC for three weeks.

Harold
7 June 2013 at 16:30 #121799
colin hawes
Participant
@colinhawes85982
Most of my small boring is done with home made silver steel boring bars.Can be made very hard. Colin
7 June 2013 at 18:30 #121810
Steve Withnell
Participant
@stevewithnell34426
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
15 June 2013 at 21:28 #122383
Robert Dodds
Participant
@robertdodds43397
Neil,

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.

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.

Bob D
16 June 2013 at 14:12 #122416
Sub Mandrel
Participant
@submandrel
Thanks Bob,

A bit beyond my budget, but usefiul as I'd missed Harold's link.

I think I'll experiment with HSS tools, but the tipped one was so easy to use

neil
16 June 2013 at 14:28 #122422
Ian S C
Participant
@iansc
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
16 June 2013 at 17:50 #122435
mechman48
Participant
@mechman48
Neil,

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.

George

Edited By mechman48 on 16/06/2013 18:11:42
16 June 2013 at 17:53 #122436
Sub Mandrel
Participant
@submandrel
Thanks George,

I have more than a fair share of broken centre drills!

Neil
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