I'm slowly (re?)learning that sometimes, the easy way is to just start over.
That's all.
Also, metric threads with an inch leadscrew isn't nearly the pain in the ass I was expecting.
losttheplot has you in his sites cc. I believe he is looking for exactly what you have just made.
Love the finish and I bet the threads dont have the Chinese free play built in.
Have you any info on where to obtain square thread tooling? I’m not having much luck and would prefer not to hand grind the tooling from scratch.
ComfyFire… :laughing:
Nice threads.
I think square or even Acme is always gonna be a grind-it-yourself deal since every different pitch needs its own dedicated form tool with that pitch's specific root width. Even if they do exist I don't want to think about what it would cost to buy a set.
http://www.thinbit.com/products/threading/gt_acme_threading.html
That's the closest I can find (their site is a mess, there could easily be a page for square threading tools and nobody would ever find it). They will do custom tooling though, all you have to do is send them the CAD files. And probably several tens of thousands of dollars.
Very nice Mr chair ….this has me looking at lights from a different perspective . creating instead of modding something already made …cool thread … threads
Yeah, the threads on the original tube were garbage (and/or also the threads in the head & tailcap). During the process I discovered that the head and tail female threads are different sizes, the new tube is cut to fit each end now. Flip it front to back and one end won't start, and the other one falls off.
Nitecore sr3 (early magnetic ring light ) had the same thing…different threads on each end and i think maybe the head side was tapered …just to make you want to kill yourself …A 16340 light that was destined to never become an 18650. Nitecore made a few tubes…just enough that the rumor went round that they existed ….
I decided I like it better as a 16340 anyway
Massive SS bezel makes it my Nightstand Nitecore
Oh no, they meant for both ends to be the same, they just failed. On the original battery tube threads, the head end's major is 0.896", tail's major is 0.894". Close enough that you can call them the same (except that it doesn't fit either the head or the tail well at all). On the new tube that was cut to fit the existing female threads, the head's major is 0.912"(!!), tail's is 0.904".
great machining job there CC,
just trying to remember back to when I was a apprentice when doing metric threads on a imperial lathe
I think you could only engage the feed on 1 index mark or you had to reverse the lathe to keep it
in sync…been a while… 
Can you remember that far back? The only thing I remember was it was 1979 and the lathes were I think little Hercus’s. I still leave mine engaged until I’ve finished. Next time you drop in you can show me how to use it properly.
Thanks for the info on the threads cc. More research to be done.