Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
Class of Threads?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Trickymissfit" data-source="post: 932821" data-attributes="member: 25383"><p>there are different grades of threads, and there is also what you get as compared to the thread diameter. Nobody here is grinding the helix angle on barrel threads, and there's only a small handful of folks capable of grinding an internal thread (I've only known about six with the knowledge). Turning the thread in a lathe is good for a class three at best, but you still can get a nice thread that way. You just match the O.D. pitch diameter to the I.D. pitch diameter. Some go so far as to lap the two into each other. The Federal standards for thread fit also figure in thread contact area. With a typical one inch plus thread your talking 65% max. Much more and the threads will guall on contact, and will not come apart very well. There's a lot of good reading on this in the Machinist Hand Book, and the Federal Standards book (can get both at the library).</p><p> </p><p>The threads in the receiver should be used as a master to cut the male thread to. You must make them as strait as possible before even thinking about turning the O.D. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 932821, member: 25383"] there are different grades of threads, and there is also what you get as compared to the thread diameter. Nobody here is grinding the helix angle on barrel threads, and there's only a small handful of folks capable of grinding an internal thread (I've only known about six with the knowledge). Turning the thread in a lathe is good for a class three at best, but you still can get a nice thread that way. You just match the O.D. pitch diameter to the I.D. pitch diameter. Some go so far as to lap the two into each other. The Federal standards for thread fit also figure in thread contact area. With a typical one inch plus thread your talking 65% max. Much more and the threads will guall on contact, and will not come apart very well. There's a lot of good reading on this in the Machinist Hand Book, and the Federal Standards book (can get both at the library). The threads in the receiver should be used as a master to cut the male thread to. You must make them as strait as possible before even thinking about turning the O.D. gary [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Gunsmithing
Class of Threads?
Top