A single use tap ????

RBHarter

RBHarter

West Central AR
I have choices that have risks in this .

I took a Savage apart ,not a big deal. The problem comes in with the bead blasting grit that was trapped ina mount hole and galled the receiver threads . The simple solution is to just chase the threads .

No lathe available and no skill set . I'd have fixed it by now and made a couple of other modifications , it's an Axis.
A tap for the 1.055 x20 is $189 ...... Not for a tool I'll use once maybe 3x .
If I were to use it more than 5 times it would be cheaper to buy than to rent it . Really $36 for 7 days and $8 to send it back isn't bad for a $200 tool you'll only use once .

The 1.055 is the problem not the 20 TPI . It's just an SAE thread not some weird shape or odd depth .

My thought tonight while I was finding a new never project I don't want was to simply cleanup the barrel nut place a 1/2-20 taping the threads and fill it with Cerrobend . Unscrew the tap and plug and chase the threads when it cools . I only need it to last about 15 turns and I'm not really cutting a thread .

If I were certain about it he used up 06' barrel I'd just lop off the threads and cut 3-6 grooves in it and chase it that way.
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So is the poured lap with a cutter viable ?
should I try just a poured lap and use Clover paste ? I feel like it would eat the lap ...
 
Ian

Ian

Notorious member
Should work fine. I repaired some damaged receiver tube threads on an AR lower with a tap and a whittled-down chunk of closet rod grooved on a table saw to hold the tap square and secure.
 
O

obssd1958

Well-Known Member
I got an Axis short action from an auction. The barrel had been obstructed, and it actually split at the end.
The barrel had been removed before I got it and I had a bunch of barrels anyway, so I rebarreled it to 22-250.
I found that when I started screwing in the new barrel, it would get tight and I would have to back it out. After a little research, I found that this is a common problem with these guns, because Savage bead blasts them and the media gets into the threads between the barrel, the receiver, and the barrel nut.
I used WD40 and carburetor cleaner, along with a toothbrush, and cleaned all of the media out of the threads. I was very careful putting everything back together, because I didn't want to get anything stuck or galled, but it went together smoothly after the cleaning.
 
S

STIHL

Well-Known Member
We messed the threads on a headstock up, on a brand-new lathe, one time. Valve lapping compound and a back-and-forth motion with the tube and the chuck collar smoothed it out and allowed the chuck to spin on to the headstock. not 100% how it happened, but anyway. the lapping compound worked.
 
RBHarter

RBHarter

West Central AR
I've been through it with solvents and brushes. The B nut spins freely on the barrels without drag or bind .

I will think on this a bit more . I will have the new barrel shortly . It's a speciality custom turn so I don't want to ding it .
 
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