CBN insert boring?

[savet06]

Al,
There is a great Youtube channel, Stefan Gotteswinter, and he uses small, often home ground, CBN tools all the time. You may already be aware of his channel, but thought I would throw it out there not as a source of tooling but ideas on how to acquire the pieces/parts and the process needed to make them work.
Not sure if you have the grinding part of the equation in your shop, but could be helpful if you end up using them frequently.
Good luck with your search,
Mike

[alinwa]

Al,
There is a great Youtube channel, Stefan Gotteswinter, and he uses small, often home ground, CBN tools all the time. You may already be aware of his channel, but thought I would throw it out there not as a source of tooling but ideas on how to acquire the pieces/parts and the process needed to make them work.
Not sure if you have the grinding part of the equation in your shop, but could be helpful if you end up using them frequently.
Good luck with your search,
Mike

I checked it out, thank you

[SGS]

Hi Al,

When I was in the business of carving that hard 17-4 and 416, I used coated carbide and ran fast. I would drill as close to bore size as possible, then take cuts of equal amount with plenty of coolant. Light cuts, or slow cutting speed are death to some carbide inserts. The coolant may or may not make a big difference depending on the coating.
I do use CBN inserts, but for very hard stuff like taking a little off the bottom of a size die or other heat-treated tool steel parts. Over RC 50.

[alinwa]

I got a nice one quarter inch pilot hole drilled through the 416 no problem, and I can machine it with my carbide tooling. The 17-4 is an entirely different animal. I wrecked a couple of good drill bits and when I put a carbide end Mill up against it it just squealed, I don't have any long carbide bits and it looks like I'm kind of at an impasse with the 17-4. Both of them are marked at 38 hardness

[Lee Martin]

SCT has a wide variety of boring bars:

https://sct-usa.com/wp-content/uploa...atipboring.pdf

-Lee
www.singleactions.com

[FBecigneul]

Thanks for posting that, Lee.
It will be very helpful.

[alinwa]

Thanks for posting that, Lee.
It will be very helpful.

Understatement of the year..... YES, Thank You Lee! That exactly fills my bill.

[sdean]

SCT has a wide variety of boring bars:

https://sct-usa.com/wp-content/uploa...atipboring.pdf

-Lee
www.singleactions.com

I have been following this thread. Thanks for the link Lee.
If anyone has the least bit of interest in pistols do yourself a favor and read through Lee's website.
Great pictures and even better articles. One day will have to find a way to get a pistol Lee has worked on.
Stephen

[brickeyee]

Have you tried a hardened HSS tool?

They can be surprisingly tough.
Carbide is at its best with faster speeds and larger cuts.
The larger shavings cary off a lot of heat generated in cutting.

Properly hardened and tempered HSS is actually pretty tough.

ETA:
You can also make a HSS cutter that is within a few hundredths of hole
diameter for maximum strength.
Just make sure you can clear the swarf with a channel the length
of the cutter.

[Pete Wass]

McMaster-Carr has them I just noticed. I was lucky enough to be able to buy a few from a used tool place near where I live summers. They had no idea how to price them so it was my gain, for once. I keep one in a tool holder, ready to go.

Pete

[LVLAaron]

Have been using this boring with good results taking lite cut with my Heavy 10.

Chet


Attachment 25161

I've been using a similar 6mm cabide insert tool - I like it A LOT more than something like a micro 100 carbide single point cutter

[R Stiner]

Carbide Depot sells them.

[alinwa]

Carbide Depot sells them.

THANK YOU!!!


Source

photo of package


I've got PAGES like this > < and cain't make heads or tails

[GeneT]

THANK YOU!!!


Source

photo of package


I've got PAGES like this > < and cain't make heads or tails

I'm not sure that they still do it, but Sandvik used to send out a nice hardbound book on cutting tools and inserts - that went miles toward allowing me to figure out what the heck I was ordering and why some of my blind guesses hadn't panned out so well... (book is good even if you never buy a Sandvik insert.)

GsT