boring bar inserts
#11
(07-27-2013, 08:19 AM)PixMan Wrote: That's a common boring bar, but I still don't understand the design. It appears that as you tighten the screw it would naturally push the insert out of the pocket. Unless of course it's a left hand threaded screw.

I have two solid carbide boring bars that take TPG/TPU 22x size inserts. They are old Valenite VNCD 7462 and VNCD 7463. The bars use a clamp that fastens via a screw coming up from the bottom of the bar, to reduce chances of chips wrapping around the fasteners.

[Image: 422322392_photobucket_39768_.jpg]

I'm usually well versed in carbide insert tooling, but your photo of your boring bar has me confused. Your photo shows an insert clamped with no shim/chipbreaker on top. There does appear to be something strange under the insert though, and the insert seems a bit small on the I.C. size for that pocket. What am I getting wrong here?

Pixman sorry I just saw this post. will send a PM

yes the bar has a screw with a head that has hash marks around it, and is lefthand threaded.

Rick the piece that you see under the insert in the photo is something that I found that would fit under the insert to raise it high enough that the screw would clamp down on the insert. I really like the bar it cuts well and is a decent size for most of what I do for large diameter short bores.

Think I gave 19 dollars for it off of evil bay back before everyone wanted new prices for stuff that was damaged.
dallen, proud to be a member of MetalworkingFun Forum since Apr 2012.

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#12
As I said before the brand has always worked for me.
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Rick
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