12-31-2013, 08:47 AM
OK, so the holder on the left is one that uses the more-common 16ER inserts. The large modified one on the right is similar to one I also have, though my 1" square shank holders fit into the CA/400 size tool blocks for my QCTP. The inserts that one uses can be single point threading, straight grooving of widths up to .189", and full radius inserts. Very useful tool, though the one on the left is technically capable of making nicer threads.
You can actually get cresting inserts for the one on the right, though they are limited in availability and as such are costly. I think only Kennametal makes them. HOWEVER, if your tool holder is a Sandvik Coromant Top-Lock, it uses Sandvik Coromant TLT threading and TLG grooving inserts that have a clamping notch long the top of one side of the insert. All other Top Notch/V-Lock inserts of the same genre use an angled radiused groove on the TOP of the insert. The good news is that you can access a whole new world of insert by changing the insert clamp of the tool holder. The clamps are interchangeable and can be had from Kennametal, Valenite and many others for under $10.
Your lay-down threading holder is one of the smaller ones. As such, it may not have the interchangeable anvils under the insert as the larger ones do. This is also common with smaller internal threading bars, as there's no space on the holder to add the interchangeable anvil. Here's what my larger holder looks like under the threading insert:
![[Image: IMG_1192-r.jpg]](http://img.photobucket.com/albums/v466/kenm10759/Dads%20shop/IMG_1192-r.jpg)
The vast majority of threads you may do would fall within the range of the "standard" tilt of the insert, about 2º to 3.25º helix angles. The interchangeable anvils of the larger tool holders allow you to make coarser small diameter or multi-start threads with increasingly higher angles for right hand threads, or by changing to "minus" angle anvils you can make nice left hand threads.
You can actually get cresting inserts for the one on the right, though they are limited in availability and as such are costly. I think only Kennametal makes them. HOWEVER, if your tool holder is a Sandvik Coromant Top-Lock, it uses Sandvik Coromant TLT threading and TLG grooving inserts that have a clamping notch long the top of one side of the insert. All other Top Notch/V-Lock inserts of the same genre use an angled radiused groove on the TOP of the insert. The good news is that you can access a whole new world of insert by changing the insert clamp of the tool holder. The clamps are interchangeable and can be had from Kennametal, Valenite and many others for under $10.
Your lay-down threading holder is one of the smaller ones. As such, it may not have the interchangeable anvils under the insert as the larger ones do. This is also common with smaller internal threading bars, as there's no space on the holder to add the interchangeable anvil. Here's what my larger holder looks like under the threading insert:
The vast majority of threads you may do would fall within the range of the "standard" tilt of the insert, about 2º to 3.25º helix angles. The interchangeable anvils of the larger tool holders allow you to make coarser small diameter or multi-start threads with increasingly higher angles for right hand threads, or by changing to "minus" angle anvils you can make nice left hand threads.