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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Best Factory Action
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<blockquote data-quote="Trickymissfit" data-source="post: 960051" data-attributes="member: 25383"><p>A Savage short action will nearly always check out in the sub .0017" error range on a surface plate or a co-ordinate measuring device. (compound error). I've seen them just slightly over .0013" and never worse than .002". Check the others and compare. The typical custom action is machined very similarly to the way savage does, and with similar quality machinery. A very good CNC lathe will cut the basic action to about .0005" to .0008", but if you do this same work off a vertical machine center and use a tap like some do; then you only compound the error. That's why some actions have to be trued up much more than others do. You add the fixture and machine alignment into the equation. Of course you can also get the samething in a CNC lathe if the machine is not square. There are some CNC lathes out there that can cut an action the size of a 700 well under .0005", but the custom guys can't afford them (a million+ a pop). Over the top for the typical gun manufacturer as well. Plus they fragile, and need to be setup in a controlled environment. Cutting ports and things like that are not a serious issue, and can be done with live tooling or a second operation on a CNC machine center. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 960051, member: 25383"] A Savage short action will nearly always check out in the sub .0017" error range on a surface plate or a co-ordinate measuring device. (compound error). I've seen them just slightly over .0013" and never worse than .002". Check the others and compare. The typical custom action is machined very similarly to the way savage does, and with similar quality machinery. A very good CNC lathe will cut the basic action to about .0005" to .0008", but if you do this same work off a vertical machine center and use a tap like some do; then you only compound the error. That's why some actions have to be trued up much more than others do. You add the fixture and machine alignment into the equation. Of course you can also get the samething in a CNC lathe if the machine is not square. There are some CNC lathes out there that can cut an action the size of a 700 well under .0005", but the custom guys can't afford them (a million+ a pop). Over the top for the typical gun manufacturer as well. Plus they fragile, and need to be setup in a controlled environment. Cutting ports and things like that are not a serious issue, and can be done with live tooling or a second operation on a CNC machine center. gary [/QUOTE]
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