Carbide Inserts

[Ray C]

The one on the bottom left is a threading insert. If it says 32 or some other number, it's depth is designed for that specific TPI pitch. There are some that are "full profile" meaning that can cut about the full range of TPI (usually from 8 to around 40). Anything finer than 40 requires special tools -usually a one-piece carbide rod with the tip ground into it. Anything coarser than 8 likewise has a dedicated tool.

The type you show is a "lay-flat" type and can work inside smaller diameter holes. There's a similar looking one (usually a TNMC) that is mounted edge-wise. They have counter-bores on both sides of the hole and can cut left or right hand threads... -Now if only I could find a threading bar that accommodates those kinds of inserts!

Ray

Here are some of the triangle inserts I have. The one on the left are 3/8" IC, and right are 1/5" IC. What is the one on the bottom left, Is it a better type of chip breaker?

Also, can a 32x insert fit in a 33x holder?

View attachment 51102

 

[Ray C]

Correction on the 32 number. The 3 stands for 3/8" inscribed circle and 2 is the width which could be measured in a couple different base fractional sizes depending on if the 1st digit is a 3, 4 or 5.

It still stands however that some are full profile and some are not. Full profile cover a larger range of TPI pitch while others have a shorter point for more specific (usually finer) threads.

Sorry about the misleading information in the earlier post.

Ray

 

[jonathan01]

What I meant was can a regular TNMG322 insert be put into a holder the is made for a TNMG33. Being 322 is a 3/8" I.C., 2/16" thick, and a 2/64 corner radius. A TNMG 332 being a 3/8" I.C., 3/16" thick, and a 2/64 corner radius

 

[DMS]

It might work, but I've never tried it, and it will probably depend on the holder and how it holds the inserts. Some use screws, some use guide pins and clamps, and some just clamps (usually those are for inserts without a hole. I wouldn't be money on it working though...