Blueprinting Action

M

missloumudcat

Guest
I have been around a while, but have NEVER figured out just what this is. What is blueprinting of the action and how does it add worth to a rifle?

Thanks, Jim
 
Jim

missloumudcat said:
I have been around a while, but have NEVER figured out just what this is. What is blueprinting of the action and how does it add worth to a rifle?

Thanks, Jim
Click to expand...
,,,,,,,,,,,,,,,,,,,,,

A blueprinting is the same as trueing, in other words, all the receiver critical interior surfaces (bore, locking lug recesses and the thread) are cut square with the receiver face on the same set-up.

The bolt critical surfaces (bolt face/locking lugs/bolt body) are cut square to one other and the bolt body can have "accuracy humps" welded on or be sleeved or an oversized bolt fitted to get a closer fit. Again all the machining is preferably done on the same set-up.

The main advantage is, that on firing everything (the case/the bolt face/the locking recesseses/bolt body/the barrel) is in the line, closely fitted and square and that creates less "twitch and stress" on the action and adds more consistency from shot to shot.

Shoot better
Peter
 
Ditto the above posts..

...and I will add I think the term 'blueprinting" is a stupid term to use when accurate machining is what is being done with no reference whatever to any blueprint... The term should never have transferred from building car engines...

at least that is my opinion...:)
 
Excellent - thank you all. Yes, it is a very strange description for accurizing an action. As uaual, Benchrest folks come through - thanks.
 
The blueprint is what the gunsmith does after he has "trued" the action. Each action he has trued is logged into a book with all critical dimensions recorded, headspace, tenon length etc. No two are the same so each has it's own "blueprint"...at least that's how I see it. The term is used very loosely though.
 
Hal D. said:
The blueprint is what the gunsmith does after he has "trued" the action. Each action he has trued is logged into a book with all critical dimensions recorded, headspace, tenon length etc.
Click to expand...

Of all the 700 actions that have been "trued" I seriously doubt many have been logged and recorded... :)
 
Dennis Sorensen said:
Of all the 700 actions that have been "trued" I seriously doubt many have been logged and recorded... :)
Click to expand...

Do the engine builders have a blueprint when they build an engine? I also wondered about the term.
 
Last edited by a moderator:
The term "blueprint" originally referred to a copy of an original drawing made with a process that resulted in white lines and a blue background. It has come to mean several things that are not that, any drawing or even narrative that accurately describes how something is to be built, which gives a complete description including dimensions (if it is to be used to build an object) may be referred to as a blueprint, or just a plan on how a goal is to be accomplished, for example "blueprint for success".
 
Last edited:
Boyd Allen said:
The term "blueprint" originally referred to a copy of an original drawing made with a process that resulted in white lines and a blue background. It has come to mean several things that are not that, any drawing or even narrative that accurately describes how something is to be built, which gives a complete description including dimensions (if it is to be used to build an object) may be referred to as a blueprint, or just a plan on how a goal is to be accomplished, for example "blueprint for success".
Click to expand...


Yes, but. My question, or more correctly my sarcastic remark, was do the engine builders us a blueprint when they build a race motor/ I don't think so. I do know what a blueprint is and agree in this case it is a bad term. I wonder, does Butch use one when he does a motor repair?
 
Jkob said:
Yes, but. My question, or more correctly my sarcastic remark, was do the engine builders us a blueprint when they build a race motor/ I don't think so. I do know what a blueprint is and agree in this case it is a bad term.
Click to expand...

I would think there must be a blueprint on serious engine manufacturing... those $1000,000 Formula Race engines aren't just re machined larger old blocks and heads ... :D
 
Dennis Sorensen said:
Of all the 700 actions that have been "trued" I seriously doubt many have been logged and recorded... :)
Click to expand...

That may be true Dennis, but it only takes a second to do and makes it possible to set up the next barrel without the action in hand. It would be silly not to record the data. On a glue in, the data must be recorded as the action can't be fitted to the barrel as it sits in the lathe.
 
Blueprinting/Revese Taper

Now that "blueprinting" has been established how about this one, what the heck is a "Reverse Taper" concerning a barrel? :confused:

jinks
 
I just installed a reverse taper barrel on a .22 rimfire ... my first one...

The barrel starts out with a normal shank area ahead of the action and quickly tapers down in a very short distance as a very light weight barrel might do... and then the taper gets larger all the way to about a 1 inch muzzle...

I think the old terminology referred to these barrels as "swamped" barrels...
 
Butch,

Please post photos, or send to mcdaniel60@comcast.net

Dennis,

Sorry I lost my wireless connection and was not certain I connected, but I guess I did. I've often woundered about what you and Butch cleared up.

Thanks,
Jinks
 
Last edited by a moderator:
The term

The term "blueprinting an engine" comes from the good old days when a worn engine was brought back to factory specs. These specifications were taken off of a set of factory blue prints.

I am certain more than a few great engine builders have become great gunsmiths; thus the term has been carried over from the old days.

Note: It was difficult back then for the factory to build an engine to their own specifications. Remington carries out this tradition even today;-)=
 
And all that time I thought that it referred to the old engineering process of marking mating surfaces with blue grease to test the quality of fit.
 
You must log in or register to reply here.
Back
Top