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broke my first rifle...

 
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  #1  
Old 06-09-2011, 02:32 PM
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broke my first rifle...

Or, is it more correct to say that I braked it?

Can't wait to shoot it!!!
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  #2  
Old 06-09-2011, 04:25 PM
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Re: broke my first rifle...

RScott...You were right the first time... that is a pretty aggressive broke fer sure. Hopefully you "tamed" it at the same time.

Silvertp
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  #3  
Old 06-10-2011, 06:41 PM
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Re: broke my first rifle...

What method did you use to dial in your barrel? Grizzly rod, bushed range rod, indicate the diameter, the bore? Lots of ways to get there. Just wondering what you chose.
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  #4  
Old 06-12-2011, 04:19 PM
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Re: broke my first rifle...

Quote:
Originally Posted by Hired Gun View Post
What method did you use to dial in your barrel? Grizzly rod, bushed range rod, indicate the diameter, the bore? Lots of ways to get there. Just wondering what you chose.
Short answer...
I used a #2 Grizzly Rod and bushing from Pacific Tool and Gauge that just fit the bore.

Now, the rest of the story is that this was a lot of work and I'm not certain that I really went about it the most efficient way and I'm open to suggestions. So, here's what I did.

I dialed it in to <.0001" using a Mitutoyo with the bushing just inside the muzzle and then 3" deep. ...alternating in and out until it was dialed in for both locations.

Once I was within about .010" of the calculated maj/min dia, I started taking .001" cuts until I was just able to thread the break on by hand with anit-seize to prevent gauling. I guess I should really use the compound to feed in at 29-30 deg, but I went straight in using the cross-feed and the threads look/feel clean with no discernable chatter.

Next, I removed the barrel and chucked the brake dialing in the OD and faced it back to where the OD at the end of the brake matched the OD at the shoulder on the barrel and removed the first 2 threads. Doing so boogered the lead thread and I didn't have a small enough inside thread tool. So, I had to clean up that lead thread by hand.

The OD and amount of facing was based on where I had calculated that the tapered barrel and tapered muzzle should meet up with the same OD and still allow the muzzle to come within about .060" of bottoming out inside the brake.

When I took it out of the lathe and assembled it, the timing was about 1-2 degrees over rotated. Feeling blessed that it had worked out like that on the first attempt, I let that slide and went ahead dialed in the barrel bore and drilled the brake with a .260" bit and reamed it to .2877" for the .264 bullets. (6.5x284)

Finally, I polished the brake with 400, 600, 1000, 1500, and 2000 wet/dry plus WD40 at 1400 rpm in the lathe after covering the ways with aluminum foil.

That 1-2 degrees is really eating at me and I'm thinking I'll need to go back and fix that before I'm truly done. I was just confounded as to whether I should face some from the shoulder, the brake or both in order to have the OD match up at the intersection. ...or, not worry about it and just turn the OD of the brake to match the barrel using the compound rest after timing it.

It just seems like I did a lot of re-chucking and re-dialing. Any suggestions for an easier method of procedure would be appreciated.

thanks!
richard
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  #5  
Old 06-12-2011, 11:15 PM
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Re: broke my first rifle...

My first one is clocked just past and it's all I can do to ignore it. I've been clocking them slightly ahead and it seems that after taking them of a few times they are perfect.

I've been using the Griz rod to line it all up as well and the results seem good to me, I don't take the barrel out till it's finished though. I don't do much figuring I crown it, cut the tenon a little short and thread it for a snug fit then cut the shoulder deeper to clock it then open up the hole and taper to blend into the barrel. I've got it down to about 1.5-2 hrs from start to finish.

I've gone into a brake fitting frenzy after doing the first one, love doing my own work!!!
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  #6  
Old 06-12-2011, 11:37 PM
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Re: broke my first rifle...

Quote:
Originally Posted by bigngreen View Post
My first one is clocked just past and it's all I can do to ignore it. I've been clocking them slightly ahead and it seems that after taking them of a few times they are perfect.

I've been using the Griz rod to line it all up as well and the results seem good to me, I don't take the barrel out till it's finished though. I don't do much figuring I crown it, cut the tenon a little short and thread it for a snug fit then cut the shoulder deeper to clock it then open up the hole and taper to blend into the barrel. I've got it down to about 1.5-2 hrs from start to finish.

I've gone into a brake fitting frenzy after doing the first one, love doing my own work!!!
Sounds like some good pointers there.
thanks!
-- richard
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  #7  
Old 06-12-2011, 11:42 PM
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Re: broke my first rifle...

Wow Richard! You are a man after my own heart. Why just do good enough when perfection is possible. Proper thread technique is to use your compound set at 29 - 29-1/2 and keep your cross feed set to zero as a reference.

To time it up it will be far easier to dial in the barrel and cut the shoulder back. Reason I say this is you don't have to dial in that brake and start from scratch for each trial fit. I have fit brakes to prethreaded barrels and it is a pain to rechuck an item to try to cut .003" Using my DRO and going off my last cut I can take .0030" exactly time after time. I have .0002" resolution in my DRO. On timed brakes I only thread and sholder the barrel to come up 2 turns short. This gives me 2 tries at the timing before I have to recut the muzzle back. Rather than relieve the brake it is just as easy to cut a .060 relief to run your threads off into. You are going to have one anyway if you need to time.

Factory installed brakes from Weatherby and Remington are all the same way.

Here is one I did recently that started out with a .060 relief and it ended up right at 1 o'clock on the first try. You can see I just took my cut off tool and plunged right back in the amount I needed to clock up.



Here it is all timed up and Cerakoted to almost match the factory matte on this Weatherby Sporter.



FWIW: I fit these for what you paid for that brake alone.
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Build a man a fire and you heat him for a day.
Set him on fire and you heat him for life.

Only accurate rifles are interesting.

Gordy and Brady.
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