For my education, what does trueing an action consist of?

[longwinters]

On my previous post, and lots of other things I have read, guys talk about "trueing an action"? Some have said once you have done this it never needs to be done again. Does that mean that it is not done at the factory on a new rifle? What does it consist of?

Long

 

[JD338]

Long,

Truing or blueprinting the action simply means that the action is squared up.
The bolt lugs are lapped so that the entire lug (both) engage 100 % with the receiver. The receiver is also squared up so that the barrel is in perfect alignment. This will minimize flexing of the action and or bolt/lugs, thus maximizing the accuracy potential. Typical cost to have this done is $180-200
and this is money well spent.
Hope this helps.

JD338

 

[old #7]

Longwinters,
Try this site for gunsmithing info.
I am a member and enjoy the information.
http://www.americangunsmith.com/

 

[Guy Miner]

Yep. On the money above, and yes, a quality truing job generally needs to be done only once. After that it's simply a matter of having subsequent barrels chambered, threaded and installed. Much less expensive than having the action trued...

By all means, if you're going to the expense of a custom barrel, have the action trued.

Normally this is not done at the factory, at least not as good as a custom smith can do it. If you get a whole custom action, like a Surgeon or a BAT, or a Nesika, then it will be true from the factory.

Regards, Guy

 

[Antelope_Sniper]

There are 3 componets of "blueprinting" an action:
Truing the action and squaring the action are the samething. The smith puts the action in the lathe and spins it, cutting a small amount off the end of the action where the threads are, making it perfectly "square" so the barrel will screw on straight. Of the three components of "blueprinting" in my opinion, this is the most importants.

Next come lapping the lugs. This consists of using small amounts of a very fine valve grinding compounds, to insure the lugs are perfectly flat and engage the receiver.

Last is squaring the bolt face. Very similar to squaring the action, but done with the bolt to ensure the face if perfectly flat with the rounds.

If all three operations are performed the action has been "blueprinted" This ensures that everything from the boltface, to the round, to barrel are perfectly straight each and every time, maximizing accuracy....

If you consider the mechanics behind these operations, you can see why they only need to be done once.

 

[old #7]

There are 3 componets of "blueprinting" an action:
Truing the action and squaring the action are the samething. The smith puts the action in the lathe and spins it, cutting a small amount off the end of the action where the threads are, making it perfectly "square" so the barrel will screw on straight. Of the three components of "blueprinting" in my opinion, this is the most importants.

Next come lapping the lugs. This consists of using small amounts of a very fine valve grinding compounds, to insure the lugs are perfectly flat and engage the receiver.

Last is squaring the bolt face. Very similar to squaring the action, but done with the bolt to ensure the face if perfectly flat with the rounds.

If all three operations are performed the action has been "blueprinted" This ensures that everything from the boltface, to the round, to barrel are perfectly straight each and every time, maximizing accuracy....

If you consider the mechanics behind these operations, you can see why they only need to be done once.

Very nice explanation A_S :!:

 

[Woodycreek]

Very nice explanation A_S

+1

 

[longwinters]

Thank you for the info.

Long

 

[YoteSmoker]

Great info! Also, for cost savings, keep in mind you can lap the lugs as a DIY project, if necessary. You can simply tell if this job is necessary by marking the lugs with a permanent marker and see where contact is made. A lot of times, in factory rifles, contact will be less on one side compared to the other and contact may be much less than should be.