Bedding under the shank of a barrel?

[jrm850]

What I did learn it that if you poke yourself in the calf with a 5000 degree tungsten, it will not bleed. ;D

Did you happen to measure the diameter of the electrode before and after you quenched it? ;D

Hahaha, I just about spit some vitamin water on my keyboard when I read that.

 

[JRS]

We run our lathes until the bearings heat up so they can get looser? This is going to be a big time saver for me.

JRS, I hate to pile on, I really do, but you have been taught wrong on this one. They heat rivets because it makes them malleable. Weld beads get laid at greatly expanded states and shrink as they cool. Just like putting a bead inside a stuck bearing race and watching it fall out as it cools.

Google, NTE or negative thermal expansion and see what materials you can find. There are very few.

Or you can go to matweb.com and look up the different material properties. Materials that shrink when warm will have a negative number for a CTE.

You'll quickly get lost talking to me about welding. It happens to be a very large part of the work I performed at the nuke plants. Stick, innershield, and tig.

I had to take a 550 word physc test to work at a Nuke plant 20 years ago. Do they still do those?
Those tests only had a few base questions. They just asked them 10 different ways.
This thread reminds me of those tests. Any way you look at it the sky is still blue.

They still do it Tim. It's now timed. Some people were spending eight to ten hours on the test, and a fair number still failing ???

 

[JRS]

You'll quickly get lost talking to me about welding. It happens to be a very large part of the work I performed at the nuke plants. Stick, innershield, and tig.

Probably. Wish I was better at it. I was taught Oxy/Acetylene in school and and bought a Miller Econotig 18years ago to teach myself. Didn't know enough then to realize that it started at 15amps was not very good for gunsmithing. I still have it and it is still not very good for gunsmithing. What I did learn it that if you poke yourself in the calf with a 5000 degree tungsten, it will not bleed. ;D

And if you poked yourself with that tungsten at a nuke plant, the Beta booth would sound off when to try to leave after your shift. You'd be surrounded by RP (radiation protection) and security before you could blink. That 5000 degree number is big, eh? You have any idea what the temperature is in the reactor vessel at full power? To give you an idea, once the spent fuel assemblies go into dry casks after 10 years in the fuel pool, they are close to 1000 degrees. That is roughly 2% of the heat when we remove them from the reactor. BTW: The reactor doesn't expand, nor does the cask, which is only 5/8" thick.

 

[jrm850]

To give you an idea, once the spent fuel assemblies go into dry casks after 10 years in the fuel pool, they are close to 1000 degrees.

So they cool about as fast as a hot pocket? ;D

 

[Tim Singleton]

We run our lathes until the bearings heat up so they can get looser? This is going to be a big time saver for me.

JRS, I hate to pile on, I really do, but you have been taught wrong on this one. They heat rivets because it makes them malleable. Weld beads get laid at greatly expanded states and shrink as they cool. Just like putting a bead inside a stuck bearing race and watching it fall out as it cools.

Google, NTE or negative thermal expansion and see what materials you can find. There are very few.

Or you can go to matweb.com and look up the different material properties. Materials that shrink when warm will have a negative number for a CTE.

You'll quickly get lost talking to me about welding. It happens to be a very large part of the work I performed at the nuke plants. Stick, innershield, and tig.

I had to take a 550 word physc test to work at a Nuke plant 20 years ago. Do they still do those?
Those tests only had a few base questions. They just asked them 10 different ways.
This thread reminds me of those tests. Any way you look at it the sky is still blue.

They still do it Tim. It's now timed. Some people were spending eight to ten hours on the test, and a fair number still failing ???

I was working a shutdown at Catawba above Charlotte. Took a buddy down with me. He failed it. I never quite looked at him the same

 

[6xcshooter]

good god ! everybody get a piece of pipe measure it cold , then heat it up and measure it again. report back :-X

 

[Alex Wheeler]

This post has gotten weird. JRS are you seriously arguing that steel contracts when its heated? Or am I just reading this wrong?

 

[ridgeway]

This post has gotten weird. JRS are you seriously arguing that steel contracts when its heated? Or am I just reading this wrong?

+1 I'd say!!

 

[AckleymanII]

I have done it both ways and have had great luck doing it both ways as long as .250 groups are good enough. If you were to do a gun set up for Competition.....well.........

My first gun that I used for a "platform" was a Rem 700 in 22 PPC 29" max heavy varmint, guns shot groups in the low 2's and 1's were frequent, wood 40x stock with thin wall brass pipe used as pillars, bedded with Bisonite. The barrel was completely freefloated.

Then 30" unturned blanks(Hart) became the norm in our 40x's and 700's in weighted McMillen stocks. We floated some and bedded some for 6" in front of the recoil lug, could not tell a difference, three shot groups in the low 1's to low 2's were normal with a few zero's thrown in from time to time.

Remingtons and 40X are strong actions, smaller actions may push things over the edge on rigidity. I had a Sako A1 with a 24" max heavy varmint put in a McMillen Marksman stock and bedded in front of the recoil lug, can't remember how much, but the darn thing shot in the 2's using a 9 twist with a zero freebore 22 ppc turn neck Reamer shooing 50g Noslers and 50g Sierra lead tip blitz.

For a long time, I bedded in front of the recoil lug on Ruger 77's and Mausers when using Max heavy varmint long barrels, and they all shot very small groups set up in high quality stocks, pillar bedded.

If you are planning on using the action as a platform for switching out barrels, the answer is obvious, free float the entire barrel channel.