In the construction of a FTN.5/4.5/4/3, etc is it recommended to anneal the PA6-CF? It seems it looses some of it’s impact resistance and flex but temperature resistance increases and also becomes stiffer and slightly more brittle. I’m assuming it’s recommended but just wanted to verify. Thanks!
Hey I wanted to chime in here and give some context.
You are correct, in that it improves temperature resistance, but increases brittleness.
I actually do not have it listed in the docs as a required or recommended step (except the Maelstrom core).
All of our testing was on UNANNEALED PA-CF, with exception of the Maelstrom core.
So basically, we have no experience with annealed PA6CF for the FTN series. Maybe it works great, but there is a chance that it could break more easily. Really couldn’t say. We like all of our recommendations to be data driven, and we have no data on this.
Wanted to ask you - why the printed threads on your stuff is always not 1/2x28? Is that something that impacts the performance?
Also, do you think printing a thread adapter from 1/2x28 to the correct thread for your stuff is a viable option or it should be a non-printed metal adapter?
In general, I hate printed threads. It is a longevity issue
If you are gonna print threads, the coarser the better.
The thick threads of the inserts on the FTN.5 work great. 3/4x16 printed threads work okay.
5/8x24 printed threads are barely adequate, and 1/2x28 printed threads suck.
The finer the thread, the more likely it will wear out and the thread adapter will slip out. This varies of course on caliber. A disposable 22lr can is probably fine to have printed 1/2x28 threads.
However, between heat and sustained pressure, and also the risk of cross-threading every time you screw it on and off means that longevity is limited
I have a question about the FTN.5 and the printed shell, is a 14" barrel safe with the printed shell?
So we had a PPA-CF one on a 14.5" that broke. Also a PA6CF one on a 10.5" that broke.
I think you have a chance if you use PA6CF.
It seems that PPA-CF is weaker than PA6CF, although I am told by confuzled that it may be because we couldnt print higher than 300 degrees, and impact resistance is improved if youre printing at 320
If you do try, it let me know how it does
I’ll probably try it out since the new flow through can prints way easier for me. Had to use the tight breek because the original one had too much play and caused bore misalignment. So far so good now.
any reports on pps-cf printed at temps >350 ?
Nope, nobody was set up to be able to print over 300.
I have been told that performance is much better when printed at 320 or higher
cool… once i get my qidi plus 4 gears cleaned, i may try to print something in pps-cf.
i may also try plain pps…
im new to this side of the community. where can one purchase a thread apapter ? specifically for the ftn5 rimfire device ? maybe amazon ?
per the readme…
“Assembly - Screw in a 1/2x28 to 3/4x16 thread adapter (you can epoxy it in if you want)”
They are commonly found on amazon and ebay, and are pretty cheap. Usually under 10 bucks
thanks for the response.
Yes, the greatly improved heat tolerance far outweighs the small loss of impact strength. And even annealed, the moisture conditioned impact strength of PA6-CF will be higher than most other materials.
Awesome, thanks!
I personally hardly ever anneal anything anymore. Sometimes I will anneal small functional parts, but more than none I just allow them to absorb moisture so that they get their elasticity. I have done both ways on FTN’s and they stand up very similarly. You will be fine by not annealing a FTN.
Yeah lol I never anneal either. Too lazy, my NYLAUG, STG, DB9, and DEAR22 have been fine for awhile.
I personally don’t think it makes enough difference in our area.
