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Rifles, Reloading, Optics, Equipment
Gunsmithing
Question on tenon size after threading...
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<blockquote data-quote="entoptics" data-source="post: 2849533" data-attributes="member: 104268"><p>I've run into a problem where my recoil lug won't fit over my tenon on a brand new Savage prefit (not the first time, sadly). No need to mention names at this point, but my question for you smiths is this...</p><p></p><p>If the nominal diameter is 1 1/16" (1.0625") how big would the tenon be after threading?</p><p></p><p>My OEM recoil lug is giving me 1.0625" on the nose with my calipers.</p><p></p><p>2 OEM barrels, and the shot out Shilen I'm replacing, are giving me 1.049-1.050 OD of threads. Recoil lug obviously drops right on these without fuss.</p><p></p><p>The new barrel I'm trying to install is giving me 1.060" OD, and there's no way I can squeeze the recoil lug down over this diameter with only 2 thousands clearance. The new barrel does thread into the barrel nut and receiver OK, but with a little bit of resistance not felt with OEM or Shilen.</p><p></p><p>Let's pretend it's irrelevant that this is a "drop in" prefit, and should work with whatever the OEM provides regardless of "nominal", but for arguments sake, assume that "nominal 1 1/16" is the "tenon diameter". I'd always assumed that was the diameter before threading, and the final threaded diameter would be smaller (and that's apparently what Savage and Shilen think), but since I've never done any threading, I guess I have no idea if the OD stays nearly the same during a threading job, or if some material is cut back from the OD of the threads.</p><p></p><p>What say you?</p></blockquote><p></p>
[QUOTE="entoptics, post: 2849533, member: 104268"] I've run into a problem where my recoil lug won't fit over my tenon on a brand new Savage prefit (not the first time, sadly). No need to mention names at this point, but my question for you smiths is this... If the nominal diameter is 1 1/16" (1.0625") how big would the tenon be after threading? My OEM recoil lug is giving me 1.0625" on the nose with my calipers. 2 OEM barrels, and the shot out Shilen I'm replacing, are giving me 1.049-1.050 OD of threads. Recoil lug obviously drops right on these without fuss. The new barrel I'm trying to install is giving me 1.060" OD, and there's no way I can squeeze the recoil lug down over this diameter with only 2 thousands clearance. The new barrel does thread into the barrel nut and receiver OK, but with a little bit of resistance not felt with OEM or Shilen. Let's pretend it's irrelevant that this is a "drop in" prefit, and should work with whatever the OEM provides regardless of "nominal", but for arguments sake, assume that "nominal 1 1/16" is the "tenon diameter". I'd always assumed that was the diameter before threading, and the final threaded diameter would be smaller (and that's apparently what Savage and Shilen think), but since I've never done any threading, I guess I have no idea if the OD stays nearly the same during a threading job, or if some material is cut back from the OD of the threads. What say you? [/QUOTE]
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Question on tenon size after threading...
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