Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Gunsmithing


Reply

My action truing jig.

 
LinkBack Thread Tools Display Modes
  #1  
Old 06-21-2010, 12:19 AM
Platinum Member
 
Join Date: Nov 2008
Location: SW Montana
Posts: 4,401
My action truing jig.

I finished up my action truing jig today, I'm kinda proud of it as it is my first cuts on a real lathe not a mini. I trued the outside and bored the inside true to it and faced it off. Then put it in the dividing head and drilled and tapped the holes.
I learned that you can't screw around dial in a good cut and let'er rip, carbide tooling is my friend, .050 cut like butter then a .020 smooth, I had a perfect finish till a piece of the ribbon slung around and then I had to give it a light polish!!
I don't think I'll see any flex in it, all I need is something to dial in the action with and brass tips in my bolts and I'm in business!!
Let me know if you have any suggestions!!



__________________
High Fence, Low Fence, Stuck in the Fence, if I can Tag it and Eat it, it's Hunting!

"Pain is weakness leaving your body"
Reply With Quote
  #2  
Old 06-21-2010, 07:26 AM
SPONSOR
 
Join Date: Mar 2004
Location: Danville, PA
Posts: 1,082
Re: My action truing jig.

Looks very nice. I built one that looks just like that about 8 years ago and still use it to this day. The only thing I did was add another row of holes towards the rear for short actions. From from front to rear holes, center to center mine are 5" for long actions. The another row of holes from front to rear, 4" center to center for short actions. Use a thick enough brass tip and make some extras. Every now and then I have one break off. I replace the brass tips about once a year also. I use GTR's bushings and mandrel for blueprinting actions, it's the only way to really true up a action correctly. Good luck !! Here's a photo of mine.


__________________
Home of the "EXTENDED IMPACT" DVD

www.mcrifles.com

Last edited by Kevin Cram; 06-21-2010 at 07:36 AM.
Reply With Quote
  #3  
Old 06-21-2010, 09:43 AM
Platinum Member
 
Join Date: Jun 2009
Posts: 1,654
Re: My action truing jig.

Good Job. Bigngreen

BB
__________________
"Molon Labe"
IN DIXIE WE DON"T CALL 911 !
Reply With Quote
  #4  
Old 06-21-2010, 10:19 PM
Platinum Member
 
Join Date: Nov 2008
Location: SW Montana
Posts: 4,401
Re: My action truing jig.

Thanks for the replies guys!! I'm going to have to get a mandrel to get things lined out, that's the next PTG order I'm thinking.
__________________
High Fence, Low Fence, Stuck in the Fence, if I can Tag it and Eat it, it's Hunting!

"Pain is weakness leaving your body"
Reply With Quote
  #5  
Old 06-21-2010, 11:50 PM
Platinum Member
 
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,060
Re: My action truing jig.

bigngreen,

Nice job! Very nice.

Now you're gonna be dangrus!

Between you and Kevin I may as well stick with a file and chisel.
Reply With Quote
  #6  
Old 06-22-2010, 01:48 PM
Silver Member
 
Join Date: Aug 2009
Location: Carlisle, PA
Posts: 478
Re: My action truing jig.

Looking good! Real good. While you have it in the chuck and centered, mark the chuck jaws so you can get it back real close when you need to put it back in the chuck. You might also use a large cone center in the tail stock to help align it with the headstock when you are installing it in the 4J.

I made my own mandrel and bushings.

I bought a piece of 1/2" precision ground shafting to use for a mandrel, and a 1/2" chucking reamer. Using the reamer to finish the ID and the compound set at a 2.5 degree angle to permit accurately setting very fine depths of cut I made my own set of bushings in .0002" sizes to use for aligning receivers in the fixture.

How the bushings are made is important. It is critical to have the ID and OD as close to perfectly concentric with each other as is possible. I chucked the raw material (12L14) in the 3J, center drilled and then drilled the rod 1/32 undersize, then used a boring bar to enlarge the ID within a thou undersize with the surface being perfectly concentric to the lathe spindle centerline. The drill will wander around, the single point cutting boring bar assures the hole is straight and true and centered on the lathe axis so that when the OD is turned it is perfectly concentric with the ID. Then with the lathe running as slow as it will go using lots of cutting oil I carefully reamed the hole to to exactly 0.500" which made it a perfect barely sliding fit on the precision ground shaft which measured 0.4995". After reaming and before turning the OD I checked it with the same .0001" test indicator I use for aligning barrels in the headstock. I only had one that showed any morement at all following this procedure - I cut it off and made another one which didn't show any movement. I checked the OD for concentricity with the same indicator after it was turned and polished.

The OD of the bushings in the set were turned to diameters spanning the useful range (I forget the exact dimensions) in increments of approximately 0.0002". It took me a while to make the 12 or 14 bushings but they work great. With the shafting between centers I can spin a bushing on it and see essentially no indicator movement which is what I was looking for.

Greg's mandrel and bushings are world class, hardened and precision ground to perfection. I just couldn't afford them, and since I work with Savages I don't need to ream the bolt bore and sleeve bolts, so I made my own mandrel and bushings.

I concurr with the suggestion to make a second set of holes for short actions. I did that on one of the two I made.



I put the original set of holes too far back so I ended up with three sets of holes on the chuck end. The shorter fixture is used with an internal collet like this:



Looks to me like you're rolling!

Fitch

Last edited by Fitch; 06-22-2010 at 01:51 PM.
Reply With Quote
  #7  
Old 06-22-2010, 04:18 PM
Platinum Member
 
Join Date: Nov 2008
Location: SW Montana
Posts: 4,401
Re: My action truing jig.

Fitch, that post was perfect timing!! I was looking at the reamer and bushings and I realized how much coin I was going to drop and I just about dropped

I'm setting up for Savages so I was also thinking there is a step that isn't neccesary unless I wanted a PTG bolt to go with it and then, I figure you just defeated the purpose of shooting a Savage over a custom action anyway.

The jig has a Savage short action in it, I spaced the holes so the bolts were right over the most meat in the action, I didn't have a long action on hand to check it out. I want to make another one that uses the split sleives like your short one for long actions. It's good practice for my general lathe opperating skills to make tools anyway.

Do you think you could post the O.D. of the bushings you made for your mandrel or PM them to me, I'll search out a mandrel right now.

By the way I made it out of a truck axle tube, I priced out some heavy walled tubing and they quoted me 23 bucks and inch, I sprinted out of there before I had to give them a cover charge to come in the store!!!
__________________
High Fence, Low Fence, Stuck in the Fence, if I can Tag it and Eat it, it's Hunting!

"Pain is weakness leaving your body"
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: My action truing jig.
Thread Thread Starter Forum Replies Last Post
Cost of rebarreling and truing avfromvt Long Range Hunting & Shooting 14 07-23-2011 11:36 PM
action truing fixture rscott5028 Gunsmithing 5 03-31-2011 10:09 PM
I anyone truing up case heads? tlk Reloading 8 07-17-2010 02:18 PM
truing action on factory rifle? cdn shooter Gunsmithing 2 04-24-2009 07:24 PM
Truing or squaring an action BrokenHorn General Discussion 8 03-08-2006 06:27 AM

Current Poll
Where in the US do you live?
West of the Mississippi River - 60.83%
899 Votes
East of the Mississippi River - 36.87%
545 Votes
On the Mississippi River on a houseboat - 2.30%
34 Votes
Total Votes: 1,478
You may not vote on this poll.

All times are GMT -5. The time now is 03:09 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC