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Just finished a Lothar Walther barrel

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  #22  
Unread 07-18-2008, 06:29 PM
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interesting thread

Thanks to all for sharing their experiences. I'm not a gunsmith (my brother is), but I still found the information shared here a good read.
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  #23  
Unread 07-18-2008, 08:12 PM
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I think threads like these are great , their are so many differant ways to skin a cat and everybody does it differantly and disscussions like this help to shed lite on subjects that some folks may have questions about. I have found that alot of folks that visit disscussion forrums like these are scared to ask questions because of the all the "keyboard cowboys" out their that like to bash your question or bitch about the question if its been asked alot in the past , not everybody is realy computer literate and can use the search function well so they end up looking though months of topics for an answer that sombody else maybe looking to ask also. I'm a firm believer that their are no "dumb" questions only uneducated questions.
What if we started a thread on how to blueprint an action or install a barrel , their would be alot of differant folks putting their methods out their and alot of olks would probably be asking why that would work.

I'm not a gunsmith by any streach of the word , I'm a machinest/millwright full time and a police officer part time , I like to think I pretty damn good at both , I have folks ask me how do do differant things for each trade both that have years somtimes decades experiance for the sake of that they may not know how or just wonder why i do it the way I do. I'm always open for sombody to teach me somthing new weather it be a harder/longer way thatn I have or not , knowledge is a key that will help you unlock things on a day to day basis. Alot of the gunbuilders here build more guns in a month than I have ever built , I like to think I have apretty good grip on the right way to build a great weapon but some may think my ideas are crazy , and they maybe ,but ,they work and I'm open to learn somthing new. I look at machine work , martial arts , bodybuilding(my other hobby) CQB and about anything else I get into the same way and I think that everybody should.

Tom , I got my shoulder scoped Tuesday AM , its going good no pain killers needed post opperation , my range of motion is about 90% its still a little uncomfortable reaching over my head quickly. I'll probably be out of any weight lifting for a couple weeks. Working on getting parts for a couple new builds to replace the one I had to sell earlier this year.
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  #24  
Unread 07-18-2008, 10:58 PM
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Quote:
Originally Posted by James Jones View Post
Tom , I got my shoulder scoped Tuesday AM , its going good no pain killers needed post opperation , my range of motion is about 90% its still a little uncomfortable reaching over my head quickly. I'll probably be out of any weight lifting for a couple weeks. Working on getting parts for a couple new builds to replace the one I had to sell earlier this year.
Curious....

rotator cuff tear? arthritic debridement? A-C separation? Tendon rupture?

Pulsed ultrasound is a good passive modality post operative for the first few weeks, then conversion to continuous ultrasound to maintain control of potential adhesive scar tissue and potential calcific deposition. Obviously ROM is prudent; flex/ex, abduct/adduct, internal/external rotation, both neutral anatomical position and "baby arm."
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  #25  
Unread 07-19-2008, 08:30 AM
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Hey Derek , I sent you a PM to keep from derailing the thread.
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  #26  
Unread 07-19-2008, 11:11 AM
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Quote:
Originally Posted by James Jones View Post
Hey Derek , I sent you a PM to keep from derailing the thread.

You have a reply.
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  #27  
Unread 08-30-2016, 01:08 PM
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Re: Just finished a Lothar Walther barrel

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Originally Posted by specweldtom View Post
Learned several things about the 17-4 PH Walther barrel. I used a hi-speed steel parting-off tool and chamber reamer, and carbide turning and threading tools. Overall, the barrel had a "crunchy" feel and sound with either type tool, and the finish was not as smooth as 416 stainless barrels. The reamer is a fixed pilot .30 x .378 Wby finisher (Clymer) that had only cut 3 chambers. 40 rpm with my normal feed rate actually tore small chunks off the shoulder face and made a rough looking neck and body wall also. Tryed different speeds and settled on 63 rpm. Neck and wall finish were acceptable but the shoulder face was still too rough. By feeding only .025" deep between cleanups and slowing the reamer feed way down (enough to risk rubbing and work hardening the surface), the shoulder face was acceptable and the body wall actually got very nice. I have a Hawkeye borescope that I use to check the chamber appearance as I go. I only had "black magic" threading dope, so couldn't try different cutting fluids. There probably is something better.

This barrel took approx twice as long to chamber as a 416 barrel. Just over 7 hrs, in two sessions. I like the physical properties of 17-4 for a barrel, but am not sure yet that they warrant the extra work. This barrel also had the Blackstar treatment, and the bore is measurably oversize. With a G.I. .30 cal bore gage, I got .3005"-.301" land diameter, with a slight steady taper tightening toward the muzzle, thank goodness. Dave Manson recommended a replaceable pilot reamer because the fixed pilot would probably be too loose in the Blackstar barrel. He was right, but I had a .0005" bore runout setup, and decided to try the reamer (in a floating holder) anyway. My theory is that in a good concentric setup, the reamer will naturally try to center itself, also that the long Wby freebore in the reamer might help hold center. Must have worked, because with the Starret last word I measured .0007" on the belt cut ,worst case, and .0006" on the wall about an inch in, as far as I could reach.

This rifle is my own, and I unscrewed a good Hart barrel to try the Walther. I don't know enough about these barrels to put one on for anyone else, and I figured that the .30 x .378 on a Mk V action would be a good test for it.

Bottom line, quite a bit tougher to work than a 416 barrel, but if a mullet like myself can do it, a real 'smith would have no trouble at all. Now, to see if it will shoot well. I'm hoping for sub 1/2 moa, because I've seen it with Hart and Shilen barreled .30 x .378's.

This is long winded, but might help someone else thinking about using a Walther stainless barrel, with or without the Blackstar treatment.

Good shooting, Tom
Tom,
I have this barrel in 30"attached to a Remington stainless action Blueprinted. It has shot 100 yard groups at .388 (5 rounds) and 200 yard at .402 (5 round)
The speed I'm getting with a 210 Accubond is 3308 fps. Amazing!
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  #28  
Unread 08-30-2016, 04:20 PM
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Re: Just finished a Lothar Walther barrel

Forty RPM is not too bad for the surface diameter, but the issue is never the RPM. It's the actual surface speed. Valenite make special inserts for 17ph-4 steel. The steel is tough, and will work harden quickly. 17ph-4 likes to be crowded when cutting. Light cuts will get you in trouble sooner than later. BUT if you hate this stuff, then try MAR-10 ( a pre-treat form of 17ph-4 re-arc melt). I've cut a lot of both, and never had a surface finish problem. The steel is odd to ream, and I've found .005/.0075" to be about right preside. I have reamed less than .0035" with little trouble. Single point thread can be a bitch! I tried all sorts of inserts, and suspect a ceramic might be the ticket.

You really will separate a good lathe from an also ran with 17ph-4. Really a heavy load on the spindle bearing pack. Tool loads are heavy enough to cause the cross slide to back off, so I recommend clamping the slide down. It's never going to cut well on a Bridgeport, but if you do; then learn how to change the bearings in the quill. Drilling and tapping isn't too bad, unless you get larger than .500". Forget milling pockets, and things like that. Yet a generic K&T knee mill does it effortlessly.

gary
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