Full Profile vs Partial Profile Inserts

W

wnroscoe

Guest
Has anyone tried the Full Profile Lay Down Threading Inserts for barrel and receiver threading vs the Partial Profile?

I've been using the Partial Profile but, I'm thinking about changing. It seems to me that the FP would be better when truing the receiver threads.
 
Full Profile Inserts

I don't care for them, but from the threads that have appeared on this Forum, (no pun intended), I am in the minority...........jackie

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I think a question needs to be asked. Say to yourself, what class of thread are these tools capable of achieving? Can I achieve this with my current set-up? Whit what I have on hand?

Don't get me wrong, but weren't these made to work on high speed applications?
 
Vote For Full-Profile Here

I prefer the full-profile to the partial-profile inserts for the following reason.

The partial-profile's shape is designed to cut threads finer than those typically found on barrel tenons. That makes the point sharper. That in turn results in a deeper than necessary penetration for a smaller minor diameter and a sharper stress-focusing root to produce the appropriate pitch diameter.

I'll freely admit that the safety margin inherent in chamber wall thickness is not likely to be compromised by the above. But I like to avoid removing metal in this area if it's not necessary.

If, for whatever the reason, one decided to set back a barrel without removing the entire original tenon, a full-profile insert makes it a whole lot easier, for me anyway, to pick up the existing thread.

Also the sharper point of the partial-profile insert is more prone to breakage.

As for speed, I get great results running as low as 25 rpm though I usually thread at 60 using Sultex-D, a dark cutting oil. Un-coated inserts and a rigid set-up will go a long way to producing a good thread finish.

FWIW
 
Thanks for the replys. It seems that the full profile would be the ticket espicially for chasing the internal receiver threads. Proper thread depth with the FP would be easier to obtain when doing so and a nicer thread would be the end result.
 
tool holder and Inserts

William

Look at Kaiser Thin Bit Tooling. They have any profile you can imagine. I have them cut me tooling inserts in HSS instead of carbide since I am working with 416 SS at speeds below what carbide is efficient. They sometimes don't list HSS but they will make any of their inserts for you upon request and at a lower cast than carbide. I find HSS last longer than carbide when run at the lower speeds especially threading.

Nat
 
Nat, I thought I remembered seeing HSS inserts in a catalog but was unable to find it again. Had me wondering if my mind was going. Will look up Kaiser, thanks. :)
 
I like the full profile inserts. When you are truing the threads in the receiver usually you enlarge them by .010. You cut your barrel tenon 1.078 for instance and keep cutting the thread deeper until your action screws on. Instruments for measuring internal threads are very pricey; this way you do not have to hit it right on. You are cutting the crest and the root at the same time.
 
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