Shorty M1A, M14, M305 projects ...
- Thread starter Otokiak
- Start date
what I <3 M14 just said
In general,
although barrel OD at the cutoff point for Chinese M14s DOES vary tremendously,
it is almost impossible to get a clean/full 5/8" thread on these barrels.
I have seen one done as a custom/one off/bastard barrel and comp in 9/16".
However,
using non-standard threads defeats the whole purpose of using a STANDARD 1/2X28 R 15 thread, with all the huindreds of comps and F/Hs that fit.
In general,
although barrel OD at the cutoff point for Chinese M14s DOES vary tremendously,
it is almost impossible to get a clean/full 5/8" thread on these barrels.
I have seen one done as a custom/one off/bastard barrel and comp in 9/16".
However,
using non-standard threads defeats the whole purpose of using a STANDARD 1/2X28 R 15 thread, with all the huindreds of comps and F/Hs that fit.
to add to that, i have seen several client's rifles now with the cut and crown/thread done elsewhere at places that shall remain un named. They appear to have been "die" cut and not lathe cut with a bore centering tool. 
I have seen, and have owned several very nicely custom machined USGI barrels with the standard usgi thread and flash hider splineways machined in on a 18.75" , cut off barrel., but as Laz stated, the chinese barrels vary too much in diameter at the threading location to reliably cut a standard castlenut thread (chinese or usgi) that is concentric to the bore at it's "minimum tolerance" outside thread diameter.
I have seen, and have owned several very nicely custom machined USGI barrels with the standard usgi thread and flash hider splineways machined in on a 18.75" , cut off barrel., but as Laz stated, the chinese barrels vary too much in diameter at the threading location to reliably cut a standard castlenut thread (chinese or usgi) that is concentric to the bore at it's "minimum tolerance" outside thread diameter.
to add to that, i have seen several client's rifles now with the cut and crown/thread done elsewhere at places that shall remain un named. They appear to have been "die" cut and not lathe cut with a bore centering tool.
I'm curious how someone could get the barrel OD to cut with a die without at least templating the thread to within 50 thou or so in a lathe with a live center? The OD is too great to get a die to bite.
That being said, in general machining when I'm worried about having a very small relief cut at the back of my thread, I cut the thread at lower speed to within a few thou and then chase with a die to get cleaner threads. Bu then, I've never cut an M14 barrel for a flash hider, and I doubt that what I'm describing is what you are referring to anyhow
It must be pretty hard to lathe cut threads that fine with a cutting tool.
Would using a 4 jaw chuck and a steady rest to get runout under a half thou if I hand turn the chuck, and then using the tailstock to center a die on the barrel and apply uniform pressure as I turn the die by hand to cut the threads be enough to ensure good enough concentricity?
Would using a 4 jaw chuck and a steady rest to get runout under a half thou if I hand turn the chuck, and then using the tailstock to center a die on the barrel and apply uniform pressure as I turn the die by hand to cut the threads be enough to ensure good enough concentricity?
all the barrels mentioned were hooped...... i have several here... good for nuthin but turning down to restrcted 16" inch length.
every barrel i have done for myself and for clients is done by Joe Dlask, on the proper machines with the proper tools, they have nerver screwed up a barrel on me yet
every barrel i have done for myself and for clients is done by Joe Dlask, on the proper machines with the proper tools, they have nerver screwed up a barrel on me yet
Cutting fine threads is NO PROBLEM on a barrel for someone who knows how to use their lathe. On a very fine thread, as mentioned, it's common to cut the thread most of the way on the lathe and then finish it with a die to get a perfect threadform. If you start the cut on the lathe, the cut will remain concentric to the bore - it's just that simple!
LuckyLuc82
CGN Ultra frequent flyer
- Location
- Rockwood, Ontario
K so I figures it wouldn't be too hard to just cut the barrel myself and save some money, I think it turned out pretty good. I don't know what the big deal is about doing it yourself, the hacksaw was pretty quick, took me less than 3 minutes start to finish. I put some tape on the tip to keep the bugs out. Can't wait to take er to the range
PS: I was just joking about doing it myself, Doug at Ellwood Epps did it for me
PS: I was just joking about doing it myself, Doug at Ellwood Epps did it for me
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LuckyLuc82
CGN Ultra frequent flyer
- Location
- Rockwood, Ontario
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