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Rifles, Reloading, Optics, Equipment
Gunsmithing
action truing fixture
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<blockquote data-quote="Hired Gun" data-source="post: 1311924" data-attributes="member: 1290"><p>Thanks for the compliment Gary. I'll have to get some current pictures of it as it is now. </p><p> </p><p>bigngreen, have you ever noticed distortion right ahead of the lug abutments and in the thread bore by holding pressure directly over the threads? Even holding it as light as we dare we noticed it with a dial indicator behind the threads ahead of the abutments and in the threads when taking the first couple cuts. At first we thought it was just poor machining from the factory with egg shaped threads or high and low spots but further experimentation found that they are not near as bad as they first appeared. To get around it we purposely hold our actions back about the back edge of the lug abutments or right over the bushing so if there was any distortion it doesn't show up in the threads. Now most everything cleans up 100% with just a few thousandths clean up. I'm certain it wouldn't hurt anything but being the nature of the internet and these forums we can't risk someone dissecting one of our builds and being able to find any room for improvement. </p><p> </p><p>A general observation not aimed at anyone. I often notice that a lot of the spiders, people are using bolts with large flat brass pads to hold actions and barrels. We found that even with flat pads as small as 3/8" those pads would try to bend the barrels, and actions to a lessor extent, to conform with the ends of the bolts. Like using a 4 jaw without a pivot wire or round pivot insert. Letting the jaws lay flat holds the surface of the barrel or action end flat to the jaws and then dial in the other end to center. On barrels held by large jaw flats or large contact pads dialing the muzzle end is just adding a curve to the barrel. No way to align the internal bore if that is your intent. To solve it we sharpened our brass contact points up to about an 1/8 round tip. The small tips allow us to hold tapered barrels without the bolt tip faces trying to bend the barrels. I hope that made sense.</p></blockquote><p></p>
[QUOTE="Hired Gun, post: 1311924, member: 1290"] Thanks for the compliment Gary. I'll have to get some current pictures of it as it is now. bigngreen, have you ever noticed distortion right ahead of the lug abutments and in the thread bore by holding pressure directly over the threads? Even holding it as light as we dare we noticed it with a dial indicator behind the threads ahead of the abutments and in the threads when taking the first couple cuts. At first we thought it was just poor machining from the factory with egg shaped threads or high and low spots but further experimentation found that they are not near as bad as they first appeared. To get around it we purposely hold our actions back about the back edge of the lug abutments or right over the bushing so if there was any distortion it doesn't show up in the threads. Now most everything cleans up 100% with just a few thousandths clean up. I'm certain it wouldn't hurt anything but being the nature of the internet and these forums we can't risk someone dissecting one of our builds and being able to find any room for improvement. A general observation not aimed at anyone. I often notice that a lot of the spiders, people are using bolts with large flat brass pads to hold actions and barrels. We found that even with flat pads as small as 3/8" those pads would try to bend the barrels, and actions to a lessor extent, to conform with the ends of the bolts. Like using a 4 jaw without a pivot wire or round pivot insert. Letting the jaws lay flat holds the surface of the barrel or action end flat to the jaws and then dial in the other end to center. On barrels held by large jaw flats or large contact pads dialing the muzzle end is just adding a curve to the barrel. No way to align the internal bore if that is your intent. To solve it we sharpened our brass contact points up to about an 1/8 round tip. The small tips allow us to hold tapered barrels without the bolt tip faces trying to bend the barrels. I hope that made sense. [/QUOTE]
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