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Rifles, Reloading, Optics, Equipment
Gunsmithing
?To nut or not to nut?
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<blockquote data-quote="Trickymissfit" data-source="post: 423420" data-attributes="member: 25383"><p>first of all when deal with threads that are larger than an inch in diameter the best you can ever hope for is roughly a 60% thread. Some folks do say they can get 65%, but I've never seen anything close to that. (read the Machinest Handbook, or better yet order a copy of thread form statistics from the Bereau of Standards from the Government. This 60% is a Class 1 ground thread. You cannot get the proper helix angle turning a thread in a lathe. A thread that's around 1/2" is best at around 70% to 75%, but the actual contact of the thread form (male to female) will be less. It just a fact of life.</p><p> </p><p>Secondly, should you manage to get that 95% thread contact; all I can say is good luck putting it together. And if by chance you do get it together; then good luck ever getting it apart</p><p> </p><p>do this: Cut a 1.05 thread to match the Savage nut. Now take a magic marker and coat the threads on the male part. Screw it together, and then take it off by screw the nut all the way accross the turned thread. Look at it under a strong light and a magnifying glass. Better yet, if you have access to a shadowgraph. Then cut a section of the nut, and clamp it to the thread form. Results make you wonder how the threads even went together. </p><p> </p><p>not being critical, but I made a living doing this for almost 40 years, and it's just the nature of the beast.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 423420, member: 25383"] first of all when deal with threads that are larger than an inch in diameter the best you can ever hope for is roughly a 60% thread. Some folks do say they can get 65%, but I've never seen anything close to that. (read the Machinest Handbook, or better yet order a copy of thread form statistics from the Bereau of Standards from the Government. This 60% is a Class 1 ground thread. You cannot get the proper helix angle turning a thread in a lathe. A thread that's around 1/2" is best at around 70% to 75%, but the actual contact of the thread form (male to female) will be less. It just a fact of life. Secondly, should you manage to get that 95% thread contact; all I can say is good luck putting it together. And if by chance you do get it together; then good luck ever getting it apart do this: Cut a 1.05 thread to match the Savage nut. Now take a magic marker and coat the threads on the male part. Screw it together, and then take it off by screw the nut all the way accross the turned thread. Look at it under a strong light and a magnifying glass. Better yet, if you have access to a shadowgraph. Then cut a section of the nut, and clamp it to the thread form. Results make you wonder how the threads even went together. not being critical, but I made a living doing this for almost 40 years, and it's just the nature of the beast. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
?To nut or not to nut?
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