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Hunting
The Basics, Starting Out
a new rifle
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<blockquote data-quote="l and r guns" data-source="post: 54820" data-attributes="member: 2404"><p>action blueprinting,</p><p>the true and correct way to blueprint an action is to open the bolt raceway to a true and known consistant dimention. this is done with a custom made cutter mandral and bushings. my shop uses a .705 inch mandral to open the raceway. the reciever is then indicated in a fixture in the lathe to less than .0001 inch with the mandral and two dial indicators. at this point, the lug seats are recut. then the threads are cut singlepoint in the lathe while in the same fixture, because the factory used a tap and the threads are never perfectly straight. the last step in the reciever process is to recut the reciever face. once the reciever is done, you set up the bolt in the lathe and indicate it in. then you cut .o50 in deep and make 2 stainless steel sleeves to go on the bolt. they are put on and turned down to .0003 in smaller than the bolt raceway. while still in the lathe, you recut the back and front of the locking lugs. lastly you recut the bolt face. now you have a perfectly truely lined up action.</p></blockquote><p></p>
[QUOTE="l and r guns, post: 54820, member: 2404"] action blueprinting, the true and correct way to blueprint an action is to open the bolt raceway to a true and known consistant dimention. this is done with a custom made cutter mandral and bushings. my shop uses a .705 inch mandral to open the raceway. the reciever is then indicated in a fixture in the lathe to less than .0001 inch with the mandral and two dial indicators. at this point, the lug seats are recut. then the threads are cut singlepoint in the lathe while in the same fixture, because the factory used a tap and the threads are never perfectly straight. the last step in the reciever process is to recut the reciever face. once the reciever is done, you set up the bolt in the lathe and indicate it in. then you cut .o50 in deep and make 2 stainless steel sleeves to go on the bolt. they are put on and turned down to .0003 in smaller than the bolt raceway. while still in the lathe, you recut the back and front of the locking lugs. lastly you recut the bolt face. now you have a perfectly truely lined up action. [/QUOTE]
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