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<blockquote data-quote="J E Custom" data-source="post: 1215005" data-attributes="member: 2736"><p>Just Thought I would add a question that I am ask all the time.</p><p></p><p>What Is Blue Printing ?</p><p></p><p>There are many different opinions on what blue printing is/should be and Maybe this will clear it up</p><p>to some degree.</p><p></p><p>First= A good inspection should be made so a plan for what needs to be done can be made (There is a definite order that should be followed for correcting any issues.</p><p></p><p>After the list of things are prioritized the work can proceed.</p><p></p><p>My list may be different than others and I may have missed something but here it is.</p><p></p><p>To simplify, I have not placed these things in any kind of order because the order may change based on the work required.</p><p></p><p>Bolt=</p><p>The bolt should be checked for any taper from one end to the other.</p><p>The diameter of the bolt should be measured and noted for later comparison to the action bore.</p><p>Locking lugs should be checked for square with the body of the bolt.</p><p>The bolt face also needs to be checked for square to the bolt body and flat. (Most are not)</p><p>The locking lugs should also be checked for surface contact % and finish.</p><p>If the surface contact is square but the finish is poor, Lapping can be done. (It should not be used to square the lugs).</p><p>The firing pin should be checked for fit to the firing pin hole in the bolt.</p><p>It should also be checked for protrusion.</p><p>The cocking piece should be checked for timing (Square to the trigger sear) for better function.</p><p>The firing pin should slip in and out of the bolt body without drag (Older firing springs tend to snake down the firing pin causing drag and reducing lock time)</p><p>Also the extractor should be checked for claw angle and engagement in the extractor groove of the brass.</p><p>The ejector plunger needs to be clean and free to move.</p><p>If everything is good or has been fixed a good cleaning and maybe polish or Jewelling is necessary.</p><p></p><p></p><p>Action=</p><p>The bore diameter should be checked against the bolt diameter for fit (I like .002 to .003 clearance)</p><p>The contact surfaces of the recoil lugs should be square to the bolt center line.</p><p>The action face should be checked for square to the bolt center line.(Most are not).</p><p>The Quality of the barrel to action threads should also be checked and chased or re threaded for fit and trueness.</p><p>Most factory action are not perfectly true on the outside or centered on the bolt center line but that doesn't matter because it is the action threads and bolt and action face that must be centered,(Some actions are shaped and it would be nearly impossible To true them on the outside(This is also the reason we push Bedding because it conforms to the shape of the action ).</p><p>While the action is set up for truing this is a good time to also check the scope base holes for center line correctness also.</p><p>Most good smiths also check the feed rails for fit and finish at this time.</p><p></p><p>I am sure I missed something, but I just wanted to explain what Blue printing involved and it's importance. If everything is as true as possible, And a quality barrel is chambered and installed correctly the rifle should function and shoot well.</p><p></p><p>In my opinion, It is the foundation for a good build.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1215005, member: 2736"] Just Thought I would add a question that I am ask all the time. What Is Blue Printing ? There are many different opinions on what blue printing is/should be and Maybe this will clear it up to some degree. First= A good inspection should be made so a plan for what needs to be done can be made (There is a definite order that should be followed for correcting any issues. After the list of things are prioritized the work can proceed. My list may be different than others and I may have missed something but here it is. To simplify, I have not placed these things in any kind of order because the order may change based on the work required. Bolt= The bolt should be checked for any taper from one end to the other. The diameter of the bolt should be measured and noted for later comparison to the action bore. Locking lugs should be checked for square with the body of the bolt. The bolt face also needs to be checked for square to the bolt body and flat. (Most are not) The locking lugs should also be checked for surface contact % and finish. If the surface contact is square but the finish is poor, Lapping can be done. (It should not be used to square the lugs). The firing pin should be checked for fit to the firing pin hole in the bolt. It should also be checked for protrusion. The cocking piece should be checked for timing (Square to the trigger sear) for better function. The firing pin should slip in and out of the bolt body without drag (Older firing springs tend to snake down the firing pin causing drag and reducing lock time) Also the extractor should be checked for claw angle and engagement in the extractor groove of the brass. The ejector plunger needs to be clean and free to move. If everything is good or has been fixed a good cleaning and maybe polish or Jewelling is necessary. Action= The bore diameter should be checked against the bolt diameter for fit (I like .002 to .003 clearance) The contact surfaces of the recoil lugs should be square to the bolt center line. The action face should be checked for square to the bolt center line.(Most are not). The Quality of the barrel to action threads should also be checked and chased or re threaded for fit and trueness. Most factory action are not perfectly true on the outside or centered on the bolt center line but that doesn't matter because it is the action threads and bolt and action face that must be centered,(Some actions are shaped and it would be nearly impossible To true them on the outside(This is also the reason we push Bedding because it conforms to the shape of the action ). While the action is set up for truing this is a good time to also check the scope base holes for center line correctness also. Most good smiths also check the feed rails for fit and finish at this time. I am sure I missed something, but I just wanted to explain what Blue printing involved and it's importance. If everything is as true as possible, And a quality barrel is chambered and installed correctly the rifle should function and shoot well. In my opinion, It is the foundation for a good build. J E CUSTOM [/QUOTE]
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