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Rifles, Reloading, Optics, Equipment
Gunsmithing
Accurizing a receiver
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<blockquote data-quote="Kevin Cram" data-source="post: 176877" data-attributes="member: 2215"><p>Under most circumstances you should not have to re-true an action if it was done properly the first time. I've had numerous actions come through that were suppose to have been trued. Before I re-barreled I set some up and checked to see how well of a job was done. On 80% or more the threads were never touched, the threads are one of the major things to b re-worked during a blueprint job, a tap can't straighten out the threads just clean the gunk out. Single point re-cutting (by someone who knows how) is the only way to true the threads concentric with the centerline of the action, and remove the taper. On 60% or more the receiver face and locking lugs were out of square to the centeline of the action by more than .003" ( I've had factory actions that were better than that without blueprinting). Then the bolt has got to be set up right for proper trueing as well. This is where alot really fail the trueing part. I use a custom ground mandrel by Greg Tannel and several bushings for the perfect fit in the actions through bore for proper axial alignment. The mandrel is double indicated in to within .0002" (usually a little closer) on a custom 8 leg spyder fixture I built, then the mandrel can be removed and all the operations for trueing the action can be done in the same set-up. </p><p> The bolt is held by a spud threaded into the rear of the bolt and the front is supported by the firing pin hole by specially made sized spuds also. The bolt body is indicated in parrallel along the length of the bolt as close as possible. (almost all bolts have a bannanna shape to them) The locking lugs are machined perfectly perpendiculat to the centerline of the bolt, then a steady rest is applied around a sacrificial collar attached to the lugs (making sure the bolt is not knocked out of alignment by checking with the indicators) so the tailstock can be removed for finishing the bolt face square. It takes a min. 6 hours to completely true an action correctly. I wish I could get $150 for the work some people do claiming they "trued" their action.</p></blockquote><p></p>
[QUOTE="Kevin Cram, post: 176877, member: 2215"] Under most circumstances you should not have to re-true an action if it was done properly the first time. I've had numerous actions come through that were suppose to have been trued. Before I re-barreled I set some up and checked to see how well of a job was done. On 80% or more the threads were never touched, the threads are one of the major things to b re-worked during a blueprint job, a tap can't straighten out the threads just clean the gunk out. Single point re-cutting (by someone who knows how) is the only way to true the threads concentric with the centerline of the action, and remove the taper. On 60% or more the receiver face and locking lugs were out of square to the centeline of the action by more than .003" ( I've had factory actions that were better than that without blueprinting). Then the bolt has got to be set up right for proper trueing as well. This is where alot really fail the trueing part. I use a custom ground mandrel by Greg Tannel and several bushings for the perfect fit in the actions through bore for proper axial alignment. The mandrel is double indicated in to within .0002" (usually a little closer) on a custom 8 leg spyder fixture I built, then the mandrel can be removed and all the operations for trueing the action can be done in the same set-up. The bolt is held by a spud threaded into the rear of the bolt and the front is supported by the firing pin hole by specially made sized spuds also. The bolt body is indicated in parrallel along the length of the bolt as close as possible. (almost all bolts have a bannanna shape to them) The locking lugs are machined perfectly perpendiculat to the centerline of the bolt, then a steady rest is applied around a sacrificial collar attached to the lugs (making sure the bolt is not knocked out of alignment by checking with the indicators) so the tailstock can be removed for finishing the bolt face square. It takes a min. 6 hours to completely true an action correctly. I wish I could get $150 for the work some people do claiming they "trued" their action. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Accurizing a receiver
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