Re: Re-cutting action threads?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Marksman</div><div class="ubbcode-body">Action truing question here, but when you re-cut action threads, are you doing it to "true" them in line with the geometry of the action? Or are you doing it to open the threads up for another reason? Also, how much larger do the threads come out after it's done?
The reason I'm asking is because I'm interested in getting a Savage action trued, but I still want to be able to use the standard pre-threaded barrels. </div></div>
If you want an action trued up just for the sake of doing it, get another receiver. The Savage stuff doesn't really need it. Not the ones I've done anyway.
To answer your question directly:
If we were to have a stack of manufacturer's blueprints laid out in front of us we'd quickly see that the bore centerline is the point from which most of the critical dimensions pertaining to center originate from. This is our Datum.
With your boutique custom receivers the production volume is quite a bit smaller than what a major manufacturer like Remington does. Remington can produce over 2500 M700's in a week. It's a 9 minute cycle time to make the receiver.
That'd be a great YEAR for most of your custom action makers.
With volume like that its reasonable to assume that not all things are exactly where we'd like them to be. -The principle reason why accurizing receivers came about.
When your "truing" a thread all your doing is:
Putting the center of the thread back to the common centerline axis that the bolt runs in.
Making sure the threads are really round.
Removing any taper, barrel taper, or bellmouth.
The size of the finished thread once your done machining largely depends on how good/bad it was to begin with. The "G" series Remingtons can require a bit of work to square away.
I personally run all my 16 pitch threads to 1.085" diameter on receivers. I do this because I have gauging made that'll allow me to qualify the thread the same way you'd do it with a 1-1/16. We do this because it allows us to use a single program (with subsequent versions to allow for various recoil lug thicknesses) for fitting up the tennon when it comes time to stick the barrel on.
Hope this helped.
C.
