View Full Version : Real world, common sense CCMT insert experience?

01-26-2012, 10:59 AM
I recently got a decent small boring bar which uses CCMT inserts. I've been perusing eBay for good deals on inserts.

The reasonably priced CCMT2's I found are meant for "heat resistant alloys, austenitic stainless steel and hard steel." Would I be wasting my money to try some of these for my HSM use with the aluminum, mild steel, O-1 and 4140 PH and use predominately?

Obviously the best thing would be to buy a quantity of inserts designed for each of the materials I use but the price spread between them and eBay surplus inserts is pretty wide. Just curious if someone with similar needs has been there, done that.

01-26-2012, 11:22 AM
For hobby use I have narrowed my inserts down to 2 types. For most steels I use a Sandvik CCMT 2(1.5)1 4225. For Aluminum I use a Sandvik CCMT2(1.5)1 AL H10

If you set up a search on ebay you can often get them at a good price.



noah katz
01-26-2012, 06:18 PM

Thanks for the links.

Are these the ones with rake suitable for low HP machines.

Which if my fuzzy understanding is correct, means they'd also be good for light finishing cuts, but not so good for interrupted or roughing cuts - is that right?

01-26-2012, 09:30 PM
In case you're unaware, A R Warner makes HSS CCMT inserts. They're flat topped, so perhaps there's a rake built into their holders but even with a neutral rake I've mostly moved off of carbide on my C/A 12x36. The HSS inserts leave a great finish and don't have a tenancy to shatter when the limberness of the lathe makes itself known.


(NFI, just a very satisfied customer)

01-26-2012, 09:59 PM
+1 on the HSS CCMT from A.R.Warner. They're neutral rake inserts, neutral rake holders. Doesn't matter. I have found them advantageous on my lathe which is pre-1950? Anyway, speeds aren't there for carbide. When I do use carbide (on another lathe), I tend to buy from this outfit: http://latheinserts.com/category.sc;jsessionid=862BF1460C242A9C66BAA63ADCD 756D0.qscstrfrnt06?categoryId=82 Yes, Yes, the CVT coatings and all that are touted for high-temp alloys and stuff like that in the manufacturer catalogs. You can read that as "a little less impact prone". I have come to the conclusion after wanting so hard to deny it that all the various coatings don't mean a damn on a manual lathe doing one-off parts. Set a manual turret lathe up and run parts even in the hundreds... then you realize the real benefits of those certain details. The only real difference in the CCMT inserts are the ones for Aluminum! That is a difference worth following. They perform unexpectedly good in comparison to the less polished inserts for steel. Just... don't use the Aluminum ones on steel. They will ruin in short order and they add up ($).

01-26-2012, 10:47 PM
I wouldn't bother trying to use the A.R. Warner HSS inserts on a small boring bar because those bars do tilt the insert downward. With a flat-top inserts you'd have a very negative-rake cutting angle.

I use inserts similar to the ones that are sold on LatheInserts.com (http://www.latheinserts.com/product.sc?productId=43&categoryId=82) for some stuff, thought only one of my many boring bars uses that style insert.


In steels I use either Valenite CCMT21.50.5-PF2 5625 or in 300 stainless some old Kennametal CCMT21.51-LF KC730.

I have way too many inserts, turning tool holders and boring bars to be able to use them all. Sad. I need to get into the home shop more!

Black Forest
01-27-2012, 02:18 PM
So being the great guy I am Pixman you can send all those inserts to me. I will even pay the postage. I only offer because I know it weighs on you to have them sitting there neglected. Crying to you to give them some work.

01-27-2012, 02:33 PM
Pixman you can send all those inserts to me.Nope, he talked about all that excess tooling in MY thread. Any freebies belong to the OP!;)

Black Forest
01-27-2012, 02:44 PM
Nope, he talked about all that excess tooling in MY thread. Any freebies belong to the OP!;)

But I like him more than you!

01-27-2012, 05:26 PM
LOL you guys are too much!

Sorry to say, but I'm not giving any of them away for free. OK, maybe one or two here & there are gifted to people who are nice to me (like BF.)

I'm a cuttingtoolaholic. I keeping finding all sorts of great bargains hidden on Ebay, and I can't seem to stop myself. On the other hand, it sure is nice having what I need when I reach for it. ;)