Left-Hand Carbide Boring Bars?

Anybody got a source for them? I need one and no, a home brewed HSS won't do, although I suppose I could do the same with a carbide blank....
Still, I like inserts so would prefer an indexable one, or at the least a brazed carbide bar.
Any clues?
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wrote:

Hold the work back to front in the chuck and feed a right-handed boring bar through the mandrel??
<I'll get my coat now...>
Mark Rand RTFM
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Mark Rand wrote:

Or, perhaps a bit easier, take a right-hand tool, fix it upside down and run the lathe backward.
--
Venlig hilsen/Best regards
Erik Olsen
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On Fri, 2 Oct 2009 20:57:43 +0200, "Erik Olsen"

Nice tries:)
But I need it for the boring head in the Bridgy, to turn down the OD of a part that overall will be far too big to fit in the lathe . And I probably should have mentioned I'm lloking for something in 1/2" shank diameter, as there are plenty of 12mm ones out there.
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Cant you run the mill in reverse? Dave
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On Fri, 2 Oct 2009 12:49:03 -0700 (PDT), "small.planes"

What he said :-)
Mark Rand RTFM
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Ask Kennametal to supply something out their American catalogue,it will be imperial. I buy solid carbide insert threading bars at 3/8" dia as it lets me screwcut left and righthand threads in bores that I could not get a metric bar to do. Ask a mate in the States to source it for you.
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All the tooling manufacturers offer their boring bars in R or L configuration.Why can`t you pick one out their catalogues?
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JL Industrial http://www.mscjlindustrial.co.uk/cgi/insrhm have several in 12mm or if that's too loose in the boring head, get a 16mm and turn the shank down to 1/2" (I had to do this as my Elliot boring head is also 1/2"); search for boring bar lh. HTH, Martin
--
martin<dot here>whybrow<at here>ntlworld<dot here>com



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Peter Neill wrote:

Okay, I may be dumb, but what do you need one for?
(and BTW they are handed; and reversing them, turning them upside down, running backwards, or whatever in combination, won't ever change that)
-- Peter
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On Sat, 03 Oct 2009 23:21:22 +0100, Peter Fairbrother

It's for use in the milling machine, not the lathe. It's a little mould tool project I'm working on. A block of P20 steel about 130mm x 120mm x 30mm thick, with a shaped pocket cut into this , 10mm deep at some points and 16mm deep in others. Standing up from the base of the pocket are a number of round bosses of different size and height. It's these bosses that need to be turned down on the outside to certain sizes, and I'm going to use the boring head to do this, hence the L/H tool to cut on the outside diameter of these.
On the mill I can just pick up a single datum then index to the co-ordinate positions and cut the bosses.
It would be very simple on a CNC but I don't have one, so I have to do it the old fashioned way.
Peter
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On Sun, 04 Oct 2009 08:33:25 +0100, Peter Neill

Then "Shirley" you can just turn your cutter around by 180deg, in the boring head, and run in reverse? I put in a switch for reverse on my X2 so that I could run a large diameter fly cutter using an old 10mm carbide milling cutter for the cutting edge. Richard
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Peter Neill wrote:

Is this one of the boring heads that has a screw on arbor and may come undone when run in reverse. If so maybe you can pin it or I have heard of them being loctited.
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Ok, I must have this envisaged wrong. If its for boring, in such a position as the carbide bit is on the outside of the circle it makes then I think if you were to turn it round, so the carbide bit is on the inside of the circle and run it backwards would it not do the job as described?
Dave
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