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Rifles, Reloading, Optics, Equipment
Gunsmithing
??? Reamer Holder ????
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<blockquote data-quote="Fitch" data-source="post: 398818" data-attributes="member: 19372"><p>The one I looked at my buddies shop is basically two flat disks, one pushing on the other, coupled for torque reaction by two posts. The disk holding the reamer is restrained from turning by two shouldered bolts that screw into the push plate that is in the tail stock. It compensates for parallel misalignment much lke the one I made does. Also, just like mine, it doesn't compensate well for angular misalignment between the tail stock quill and the spindle axis. The parallel misalignment is allowed for by some slop in the slots for the bolts that transfer the torque. I think it's best installed with the bolts vertical because horizontal alignment is easier to atain than vertical on most lathes. If the tail stock is in perfect alignment vertically today, it won't be tomorrow after some wear takes place. </p><p> </p><p>I liked the design (and cost) of mine better for me, but the Manson and the Bald Eagle have worked well for folks chambering rifles all over the planet. The Bald Eagle retains the "feel" benefits I get with mine but I don't like the inherent instability of it's design. To see what I mean, lay a pencil on your desk. Take one finger and push straight on the eraser. Unless you make corrections with your finger, the pencil will get crooked and then turn clear around as your finger passes it by. The operating principle of the Manson and one like mine are like laying something shaped like the letter "T" down and pushing on it with two fingers an inch or two apart on the top of the "T". The "T" will stay in contact with the fingers and pointed in the right direction - it will self correct for disturbances that want to make it change direction because the finger on the side it tries to move to will push it back in the other direction. </p><p> </p><p>That said, I did chamber my first barrel (a .22-250) using a poor man's Bald Eagle pusher, I was pushing on the back of bolt stub machined round and screwed into the back of the reamer with a flat surface held in the tail stock while I restrained it from turning with a sawed off (so it could spin freely if it had to) end wrench, and the chamber came out just fine. So an inordinate fixation on perfection in the pusher doesn't seem to be warranted. As long as you align the bore with the lathe spindle axis and don't force the reamer to go someplace else by pushing on it with a dead center in the tail stock, it will pretty much do what it should.</p><p> </p><p>There are three reamer holders that make sense to me. The Bald Eagle, one like I made (the least expensive), and the Manson. I didn't like the concept behind the GreTan holder which, as I understand it, has no built in compensation for parallel misalignment so I didn't persue making one like it. It apparently works great if you have your tail stock perfectly aligned and it holds that alignment as the quill is extended. I don't, the quill on my lathe's tailstock doesn't, and can't be reasonably made to do so, so I don't use it or one like it.</p><p> </p><p></p><p> </p><p>Good idea! Good candidates for finding used barrels are benchrest shooters, especially those shooting barrel burner calibers like 6.5-284. I picked up a used A&B barrel chambered in 6mmBR for $40.00 to use for practice. I sawed off the chamber, rechambered it from 6mmBR to .243Win and put it on a Savage Model 10 that had an awful factory barrel with the idea that it would be a throw away barrel. </p><p>It shoots so well I've not been able to make myself take it off the rifle! It's my backup chuck gun for windy days or long fields when/where the .17Rem won't work so well.</p><p> </p><p>Last week I picked up a used Bartline 6mmPPC barrel for nothing that I'm going to rechamber for practice during shop season this winter. I'm thinking of making it into a 6x45 just for fun. </p><p> </p><p>You have a real thrill in store for you when you chamber your first barrel and it shoots bug holes. Gets the heart rate right up there it does. Combining lathes, shooting, and hunting, is about as much fun as one can have.</p><p> </p><p>Fitch</p></blockquote><p></p>
[QUOTE="Fitch, post: 398818, member: 19372"] The one I looked at my buddies shop is basically two flat disks, one pushing on the other, coupled for torque reaction by two posts. The disk holding the reamer is restrained from turning by two shouldered bolts that screw into the push plate that is in the tail stock. It compensates for parallel misalignment much lke the one I made does. Also, just like mine, it doesn't compensate well for angular misalignment between the tail stock quill and the spindle axis. The parallel misalignment is allowed for by some slop in the slots for the bolts that transfer the torque. I think it's best installed with the bolts vertical because horizontal alignment is easier to atain than vertical on most lathes. If the tail stock is in perfect alignment vertically today, it won't be tomorrow after some wear takes place. I liked the design (and cost) of mine better for me, but the Manson and the Bald Eagle have worked well for folks chambering rifles all over the planet. The Bald Eagle retains the "feel" benefits I get with mine but I don't like the inherent instability of it's design. To see what I mean, lay a pencil on your desk. Take one finger and push straight on the eraser. Unless you make corrections with your finger, the pencil will get crooked and then turn clear around as your finger passes it by. The operating principle of the Manson and one like mine are like laying something shaped like the letter "T" down and pushing on it with two fingers an inch or two apart on the top of the "T". The "T" will stay in contact with the fingers and pointed in the right direction - it will self correct for disturbances that want to make it change direction because the finger on the side it tries to move to will push it back in the other direction. That said, I did chamber my first barrel (a .22-250) using a poor man's Bald Eagle pusher, I was pushing on the back of bolt stub machined round and screwed into the back of the reamer with a flat surface held in the tail stock while I restrained it from turning with a sawed off (so it could spin freely if it had to) end wrench, and the chamber came out just fine. So an inordinate fixation on perfection in the pusher doesn't seem to be warranted. As long as you align the bore with the lathe spindle axis and don't force the reamer to go someplace else by pushing on it with a dead center in the tail stock, it will pretty much do what it should. There are three reamer holders that make sense to me. The Bald Eagle, one like I made (the least expensive), and the Manson. I didn't like the concept behind the GreTan holder which, as I understand it, has no built in compensation for parallel misalignment so I didn't persue making one like it. It apparently works great if you have your tail stock perfectly aligned and it holds that alignment as the quill is extended. I don't, the quill on my lathe's tailstock doesn't, and can't be reasonably made to do so, so I don't use it or one like it. Good idea! Good candidates for finding used barrels are benchrest shooters, especially those shooting barrel burner calibers like 6.5-284. I picked up a used A&B barrel chambered in 6mmBR for $40.00 to use for practice. I sawed off the chamber, rechambered it from 6mmBR to .243Win and put it on a Savage Model 10 that had an awful factory barrel with the idea that it would be a throw away barrel. It shoots so well I've not been able to make myself take it off the rifle! It's my backup chuck gun for windy days or long fields when/where the .17Rem won't work so well. Last week I picked up a used Bartline 6mmPPC barrel for nothing that I'm going to rechamber for practice during shop season this winter. I'm thinking of making it into a 6x45 just for fun. You have a real thrill in store for you when you chamber your first barrel and it shoots bug holes. Gets the heart rate right up there it does. Combining lathes, shooting, and hunting, is about as much fun as one can have. Fitch [/QUOTE]
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