Barrel tennon: Convert 1”-16 to 1.062-16???

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Mram10

Cast Iron

Joined

Dec 17, 2017

• Feb 17, 2019

• #1

Fun times....
Cut a 1” shank(not threaded)for a tikka and would like to go back the other way for a Rem 700 build. It’s a carbon fiber barrel and doesn’t have enough room to cut and start over.

Option 1: build up weld and machine down. Not sure how it would affect throat, if at all, since I would chamber after.

Option 2: reduce tennon diameter to allow for a threaded bushing to be placed on top, then thread it for 1.062-16.

Not sure of option 3. Thanks

Plan on a 28 nosler chambering

 

P

pat_j0nes

Aluminum

Joined

Sep 9, 2018

Location

Colorado, US of A

• Feb 17, 2019

• #2

Don't weld on barrels.

What chambering?

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300sniper

Hot Rolled

Joined

Nov 14, 2006

Location

Greenwood, Ca

• Feb 17, 2019

• #3

I don’t think I’d touch that one. Finish the Tika and get a new blank for what you need.

Whithout doing any math, you’d probably need to turn the tenon down further to around 7/8-20 and make an 1 1/16-16 x 7/8-20 adapter.

 

M

Mram10

Cast Iron

Joined

Dec 17, 2017

• Feb 17, 2019

• #4

pat_j0nes said:

Don't weld on barrels.

What chambering?

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Click to expand...

I see people say that, yet I’ve never heard a solid mathematical reason why. Standard flux core wire is rated at 70k psi. What am I missing??
It is a personal build, so liability/suit happy blood suckers are not a factor.

 

J

john.k

Diamond

Joined

Dec 21, 2012

Location

Brisbane Qld Australia

• Feb 17, 2019

• #5

Ive welded on barrels ,old military ,probably 1340 or something like.If yours is 4140,I dont see any problems except heat effects on the wrap.....I would do a machine rotated and fed mig weld .........your preheat and postheat would need to be correct,but theres plenty of info .......

 

GGaskill

Titanium

Joined

Feb 14, 2001

Location

Central AZ

• Feb 18, 2019

• #6

I think the pre-heat and post-heat requirements will put so much heat into the steel that the carbon fiber/epoxy will delaminate and make the blank worthless. I think you need to go to 600°F and that is going to melt the epoxy.

 

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LKeithR

Stainless

Joined

Sep 1, 2011

Location

Langley, B.C.

• Feb 18, 2019

• #7

300sniper said:

...I don’t think I’d touch that one. Finish the Tika and get a new blank for what you need...

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I'm not really a gun guy but to me this just makes so much sense. Why take chances? Barrels are not that expensive...

 

M

Mram10

Cast Iron

Joined

Dec 17, 2017

• Feb 18, 2019

• #8

GGaskill said:

I think the pre-heat and post-heat requirements will put so much heat into the steel that the carbon fiber/epoxy will delaminate and make the blank worthless. I think you need to go to 600°F and that is going to melt the epoxy.

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Great points. The carbon fiber is only rated to 250f according to manufacturer. I’m sure it would get above that without an ice bath/dry ice setup. Not worth it.

 

M

Mram10

Cast Iron

Joined

Dec 17, 2017

• Feb 18, 2019

• #9

LKeithR said:

I'm not really a gun guy but to me this just makes so much sense. Why take chances? Barrels are not that expensive...

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$600 a piece!!

 

M

Mram10

Cast Iron

Joined

Dec 17, 2017

• Feb 18, 2019

• #10

300sniper said:

I don’t think I’d touch that one. Finish the Tika and get a new blank for what you need.

Whithout doing any math, you’d probably need to turn the tenon down further to around 7/8-20 and make an 1 1/16-16 x 7/8-20 adapter.

Click to expand...

Im not sure where I’d find the math for an adapter ?????

 

M

MIBill

Hot Rolled

Joined

Nov 16, 2012

Location

SE Michigan

• Feb 18, 2019

• #11

Mram10 said:

$600 a piece!!

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Are you saying that your safety and the safety of those around you aren't worth $600?

 

S

spitfire_er

Aluminum

Joined

Jul 25, 2014

Location

Minnesota

• Feb 18, 2019

• #12

Sell it and start over. Might get close to what you paid for it If someone needs a 1" thread or smaller.

 

M

Mram10

Cast Iron

Joined

Dec 17, 2017

• Feb 18, 2019

• #13

MIBill said:

Are you saying that your safety and the safety of those around you aren't worth $600?

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Nope. You’re under the assumption it can’t be done. I think it can be safely done

 

300sniper

Hot Rolled

Joined

Nov 14, 2006

Location

Greenwood, Ca

• Feb 18, 2019

• #14

Mram10 said:

Im not sure where I’d find the math for an adapter ?????

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Open your Machinery’s Handbook to the thread spec section. Find the largest thread you can that you feel would have enough meat between the receiver minor diameter and adapter major diameter. Hopefully the thread you pick for the barrel is as large or larger than other commercial barrels so you can feel warm and fuzzy that it won’t explode.

I wouldn’t even think about welding sulfurized 416 on anything critical.

 

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wesg

Titanium

Joined

Nov 4, 2004

Location

Cedar Park, TX - Boulder Creek/Redwood City, CA

• Feb 18, 2019

• #15

Yeah, I was gonna say most likely 416, and consider it unweldable.

Other option is to dump the 700 for a M-70.

 

M

Mram10

Cast Iron

Joined

Dec 17, 2017

• Feb 18, 2019

• #16

Got bored today and finished it as a 28 nosler on the tikka t3 action. As for the conversation, it pointed out another good reason to buy a machinists handbook. Thanks guys