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  #1  
Old 12-11-2005, 10:42 AM
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Barrel Thread Size?


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wHAT IS THE BARREL THREAD SIZE AND DIAMETER FOR THE RUGER 77 AND THE CHARLES DALY MINI MAUSER ?
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  #2  
Old 12-11-2005, 11:16 PM
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Ruger is 1"x16tpi.I'm not sure about the Mini,but I do know they are metric.
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  #3  
Old 12-21-2005, 06:37 AM
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corrected

The '98 Mausers are 12 T.P.I., but with a 55° thread profile rather than the usual 60°. I have no clue what it is on the mini, but watch out for the odd thread profile to be repeated when you do find out the pitch.

Nick

Last edited by unclenick; 12-23-2005 at 09:24 AM.
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  #4  
Old 12-22-2005, 04:10 PM
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All of the large ring 98's that I've run into have a 1.100 diameter, 12 threads per inch, 55 degree threads. The small rings have a .980 diameter, 12 threads per inch, 55 degree threads.
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  #5  
Old 12-23-2005, 09:23 AM
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Correction

YES! 12 T.P.I. Slip of the brain on my part. Thanks, Mark. Glad you've got my senior-moment six. I've had one too many Garands on my mind lately. I am going to see if I can edit the 10 T.P.I. error out of my post just to avoid leaving an inaccuracy posted? Yes. Done

I found one article extolling the virtues of the Mini, and remarking that it is very well made. No mention of barrel threads, though.

Nick
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  #6  
Old 12-23-2005, 12:09 PM
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No problem Nick, I just didn't want to leave some wrong information on the board.

When I was in gunsmithing school at Trinidad State, they taught the 60 degrees were the threads to put in a Mauser. Nick brings up some good information here about 55 degrees being the correct angle. I rebarrel about 3 or 4 Mausers a month and I have special 55 degree cutters ground by Thinbit. Thinbit is a tool company. You want the thread surfaces to be fully engaged with each other.
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  #7  
Old 12-23-2005, 02:05 PM
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Mark,

Thanks for the Thinbit lead. I looked over their on-line catalog and realized I'd seen a number of their inserts before, but hadn't known their origin? I use a Darex quick-change holder on my lathe, and much prefer being able to buy inserts for a tool to having to remove one from the holder to re-grind it myself. My grinding gear is not exactly first class, so it takes me quite a bit of time to be confident my setup is accurate enough.

I am in the market for an inside acme thread tool to make some anti-backlash nuts for a cheap X-Y table. I want to turn it into a bolt jewelling fixture. That and a cheap Chinese collet spin indexer I have should do nicely. I will give Thinbit a try for the threading tool.

I also have a custom thread I want to try out. This is Detroit Tool's Spiralock™ design, which distributes load much more evenly on a thread than a standard pattern does. In his book Rifle Accuracy Facts (pp 114-119, 2nd Ed, 2000, Precision Shooting pub.), Harold Vaughn said Detroit Tool would not require patent royalties from custom gunsmiths for the use of this design. Vaughn had calculated that a Remington 700 action's 16 TPI standard "V" thread had 36% of the preload on the first thread, and only 0.4% on the last thread, while putting the Spiralock™ pattern on the barrel resulted in 13.7% on the first thread and 6.6% on the last. The unloading at the breach is caused by stretching the threaded barrel tenon as the threads are tightened. Vaughn proved that fliers can result from the fact this allows lateral axis rotation during firing. More even loading keeps the barrel much better aligned with the receiver and it cured the fliers on the gun he was testing.

I tried giving Thinbit a call today, but they are closed for the holidays. I will try again Monday.

Thanks again,
Nick

Last edited by unclenick; 12-23-2005 at 02:08 PM.
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  #8  
Old 12-24-2005, 11:10 AM
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55 degree cutters for mauser barrel threads avaialble from Midway, FYI......
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  #9  
Old 12-24-2005, 07:10 PM
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MIdway and Brownells, both. I have a Brownells tool on a 1/4" shank, but the resharpening issue arises so the insert style holders appeal to me.

Merry Christmas to all, and to all a good night!

Nick
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  #10  
Old 12-24-2005, 11:09 PM
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I agree with Nick on the threading insert type of tool. I have Thinbit grind a 55 degree cutter in carbide and the last for ever. My last order was for 10 units and they will most likely last my lifetime, and NO I'm not that old.
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  #11  
Old 12-25-2005, 08:46 AM
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The other issue that arises with thread cutting bits is that most commercial V-thread tools are for a range of thread sizes. This means the tip is at least as sharp as the finest thread you can cut with it. If you look in Machinery's Handbook or other references at ANSI Unified thread specs, you see an optional radiused root on threads. These radii are unique to each thread size, but if you cut a lot of, say, 16 TPI threads for Remington barrels, and don't need to cut anything finer with the tool, you can get that radius put on the tip of the cutter. This makes the tip less prone to breakage in a carbide tool.

Since the Mauser uses a Whitworth thread that is always 12 T.P.I., it might pay, from a durability standpoint, to do the same thing? The radius on a Whitworth is the same inside and out. See below. I filched the image below from BOLTSCIENCE.COM.

Nick


Last edited by unclenick; 12-25-2005 at 09:42 AM.
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