Gunsmithing Basic question on truing...

[BigBrother]

Hey all, real simple question here on truing. I understand that it's basically the process of examining the dimensions of an action and its parts, and ensuring that they match, as closely as possible, the "true" dimensions of the original blueprints or schematics. So if a dimension is larger than necessary, there are obviously any number of ways to get it back down.

But what do you do if a dimension is too small?

 

[JJones75]

Re: Basic question on truing...

having dimentions to small is a good thing , removing metal is easy , putting it back is a bitch.

Take the bolt race ways , its the ID is say.699" then its easy to ream it to .700" and get a bolt that fits.

If you have a bolt race that .702" and your bolt is .695" then you either have to sleeve the bolt or replace it with an over sized one

Same thing with threads , if you pull the factory barrel and true the thread on the action removing say .005" then the factory barrel "should NOT" go back on as the fit will be very loose , the only option you have here is to either cut the old threads off and refit to new dimentions or rebarrel to new dimentions

 

[BigBrother]

Re: Basic question on truing...

Sorry, I should have defined it better- I basically meant any place you have to add material. In my example, I was imagining a length dimension that was too small, and hence needed material added.

Yeah, good to hear it's not straightforward, only because I couldn't figure out how you would easily do so!

 

[9H_Cracka]

Re: Basic question on truing...

Get more to the point and be specific - that is, a M700 Remmy action.

The answer is very simple - once the interior of the action is brought up true with the lug surfaces, which involves removing metal from the ID of the action and surface area of the lug, you order up a Kiff bolt without the handle attached in the diameter that gives you the bolt/receiver clearance you want.

Once the bolt is in hand, the trigger and bolt handle (primary extraction) are timed and the handle attached.

So yes, metal is removed, and needs to be added back in, to do it the right way. This is the right way.

 

[BigBrother]

Re: Basic question on truing...

No 9H, I have no action in mind.

I'm trying to learn how these things work, and wanted to understand how a gunsmith goes about matching a length of metal to a spec if the length at hand is shorter. That's it.

 

[Immorteq]

Re: Basic question on truing...

Blueprinting isn't about factory specs. It's about machining out the flaws of a mass produced product. Has nothing to do with factory schematics.

 

[BigBrother]

Re: Basic question on truing...

So why the term "blueprinting"?

 

[wnroscoe]

Re: Basic question on truing...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BigBrother</div><div class="ubbcode-body">So why the term "blueprinting"? </div></div>

It's a buzz word

 

[BlackOps Tech]

Re: Basic question on truing...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wnroscoe</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BigBrother</div><div class="ubbcode-body">So why the term "blueprinting"? </div></div>

It's a buzz word </div></div>

+1....It's one of the most over-used/mis-used words in the industry. Kinda like the words "Tactical" and "Sniper."

 

[RADcustom]

Re: Basic question on truing...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BigBrother</div><div class="ubbcode-body">No 9H, I have no action in mind.

I'm trying to learn how these things work, and wanted to understand how a gunsmith goes about matching a length of metal to a spec if the length at hand is shorter. That's it. </div></div>

You don't. You work with the specs/dimensions that are available.

 

[9H_Cracka]

Re: Basic question on truing...

I think it is a buzzword from the performance car hobby that has worked its way over here - "balanced and blueprinted" motors.

The interesting thing is, over in that world too you remove metal until you get things to straighten out then order the right sized parts to fit the new dimension...

Just like ordering a Kiff bolt once you got the inside of the action straight.

If you want to argue with the correct answers to something you don't understand, then don't ask the questions of people that do.

The funny part of Remmies is most everyone BUT remmy produces parts that are in tolerance with their M700 blueprint. That's where the problems come in. People like Glenn and Marty have to account for the fact that what they are trying to attach to rarely is done to its specified dimension.

 

[300sniper]

Re: Basic question on truing...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BigBrother</div><div class="ubbcode-body">So why the term "blueprinting"? </div></div>

in my opinion, the majority of smiths that say they are "blueprinting" an action are really "truing" it. very few people are actually making the action to an exact spec and in reality are just taking off what ever amount of material is required to make it square. there is one person on here that uses cnc to true actions and i have a feeling every one that comes out of the machine are within his designed spec, ie. blueprinted. i am planning on trying this one of these days and personally think it is a great way to go about it.

 

[Clark]

Re: Basic question on truing...

 

[BigBrother]

Re: Basic question on truing...

Thanks for the responses all. Makes sense, though Clark and 9H, I think you took it further than my original question. Clark, I actually had no interest in whether or not I should do this, I was merely asking a machining question out of curiosity to learn more.

And 9H, your pedantry seems to know no bounds. "If you want to argue with the correct answers to something you don't understand, then don't ask the questions of people that do." Go read back over this thread you arrogant ass. All I wanted to know was how a smith adds metal to a dimension if it's too short. I even corrected and asked about my terminology when I saw it was off. Nowhere did I "argue" with anyone about anything.

I've tried ending this idiocy with you before but you insist on dragging things back in the mud like a five year old. Let me paste for everyone here to see a PM I sent you, entitled "Burying the hatchet", ten friggin months ago:

<span style="font-weight: bold">"Hey 9H. I know we've both had our fun at each other's expense, but I wanted to extend an olive branch and bury the hatchet. We may have differing opinions and techniques, but at the end of the day we're both here for the same sport and the same pursuit. It's not getting us anywhere and it certainly isn't good for the forum. I wasn't approached by Lowlight or anything for this- I'm doing this of my own accord. Differing opinions or not, we can still be civil and friendly to one another.

Whatdya say?"</span>

Which you promptly deleted and didn't answer.

Seriously dude, from a guy several years younger than you: Grow the f up.

 

[9H_Cracka]

Re: Basic question on truing...

This advice coming from someone that wants to know if parkerizing an AR-15 trigger, that comes from the maker already parkerized, will increase its tactile feel...

Thanks but I'll pass.

 

[BigBrother]

Re: Basic question on truing...

The question was about texturizing, to which several people chimed in and agreed. It's also something triggers do come with, including Anschutz. Gee, I must have been really crazy.

You got some serious self confidence issues if you have to trawl my posts waiting for me to slip up so you can swoop in and correct me with your asshat tone. Did daddy not love you enough or something? Or did he love you too much?

Doesn't really matter. Enjoy your dominion over the realm of internet forums, champ.