Help with threading inserts

[liljoe]

I am almost 100% positive that I am going to order a Kennametal threading holder and need to know which inserts to order with it. I am thinking the NT2R, but what about the different grades and with or without the chip breaker? The info on carbide depot's site shows the KU25T would work good. What do you guys recommend.

Thanks

Joe Hynes

 

[gunmaker]

Call the guys at carbide depot. They have all the info you need. I bought laydown Iscar inside and outside tooling. They had great prices on Iscar. I didn't really price any other brands.

 

[JerrySharrett]

I am almost 100% positive that I am going to order a Kennametal threading holder and need to know which inserts to order with it. I am thinking the NT2R, but what about the different grades and with or without the chip breaker? The info on carbide depot's site shows the KU25T would work good. What do you guys recommend.

Thanks

Joe Hynes

Order the "C5" grade with TiN coating and positive rake. The holder you need to order will 1) be a size that will fit in your holder (Aloris, etc), 2) the correct holder pocket for the insert, or, vise versa, and 3) the insert needs to be in the 10-20 TPI (threads per inch) range. No use ordering an insert with the Vee large enough to thread a 4-8 TPI thread. This larger size will just interfere with getting close to the shoulder and will cost considerably more.

The C5 grade is the generic for steel/turning (as opposed to cast iron/finishing, etc) I think this is the Kennametal KC850 or there abouts.

 

[liljoe]

Thanks for the reply, guys. I think I will order a couple different grades and see which one works better for me. Still not sure about a chip breaker though.

Joe Hynes

 

[Rick A.]

Joe,
I will tell you what I use and why. The bar is a ¾ “cut down to ½ inch, on edge, Style TNMC-32YY, Grade 918 by RTW. Why is, it was given to me, I had it altered to fit my machine and it has done an admiral job. I did a muzzle brake on my .338 this past winter, ½ “x 32 thread with it. Until I obtained this I used cemented threading tools and hand ground tool steel, can cut prettier threads with tool steel but a pain, good experience grinding your own tooling though. Chip breaker, it will probably give a better surface finish, flip a coin ( is it that important ?) ….There is a cute little trick I learned from my neighbor and mentor, a 30 year veteran In Tool & Die ( where the threading bar came from), I won’t post it so you will have to ask me when I see ya. You did well at the SS. Harrison on the 19th??
Rick

 

[Dave Milosevich]

Here's an earlier...

...thread with some useful links in post #4. I tried to copy/paste the links into a reply in this thread but for some reason they failed to work. They still work in the original post, though.

FWIW

http://benchrest.com/forums/showthread.php?t=41061