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Bolt Bore Reaming
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<blockquote data-quote="Brent" data-source="post: 70130" data-attributes="member: 99"><p>Chris,</p><p></p><p>Many ways to get the job done, I agree. Options range from a few to seemingly endless. I've seen some very creative thinking over the last few years, amazing some of the things people come up with.</p><p></p><p>I've seen the tapered bushings/reamer setup Manson offers but never thought it would position the reamer mandrel dead center in the existing bolt bore because of the larger diameter end of the bushing's taper contacting on one side before the other like it would inserting it from the rear of the rear receiver ring or the rear of the front receiver ring. There it would contact on the tang further back on the bushing and lift the bushing from true axial alignment as it was inserted until it contacted the top of the rear ring and stopped. That would also tend to tip the bushing unless it was positioned on the mandrel before hand to keep that part from happening. In the worst case, the bushing could only cause the new bolt bore axis to deviate from the existing one by no more than .0025" at each end, so it wouldn't be enough of a problem that the bolt lugs bound up in the reaceways on the new axis. A larger than .705 OD reamer would surely be needed with this setup though. Isn't Manson's reamer .715? Is yours .715?</p><p></p><p>The one place I can see the tapered bushing working perfectly, and maintaining the original bolt bore axis is if it were placed in the front ring from the front side where it would contact the top and bottom abutment at the same moment.</p><p></p><p>I'd have one made but I don't understand how it could stay tightly fitted, as the reamer pushed it out it would begin to get slop around because of the taper. Those are the main reasons I went with the straight bushing/reamer setup GTR has made. </p><p></p><p>With the straight bushings I can find the bushing size that barely fits each end, then polish the bolt bore until the next .0005 larger bushing will just fit and pass through the bore with a little bit of effort, ie. no slop. When reamed the finish is super sweet and as close to the existing bolt bore axis as one could ever be.</p><p></p><p>One other way I've thought alot about would use tapered bushing, quite a bit more taper than the Manson bushings but these would be smaller in OD and slide into a collet with the same taper on the inside and straight on the outside, expanding it to fit perfectly, but straight on the outside so the reamer could push it through as it advances. </p><p></p><p>Is Gordy using the Manson setup too, GTR or something different?</p><p></p><p>Fun stuff! /ubbthreads/images/graemlins/smile.gif</p></blockquote><p></p>
[QUOTE="Brent, post: 70130, member: 99"] Chris, Many ways to get the job done, I agree. Options range from a few to seemingly endless. I've seen some very creative thinking over the last few years, amazing some of the things people come up with. I've seen the tapered bushings/reamer setup Manson offers but never thought it would position the reamer mandrel dead center in the existing bolt bore because of the larger diameter end of the bushing's taper contacting on one side before the other like it would inserting it from the rear of the rear receiver ring or the rear of the front receiver ring. There it would contact on the tang further back on the bushing and lift the bushing from true axial alignment as it was inserted until it contacted the top of the rear ring and stopped. That would also tend to tip the bushing unless it was positioned on the mandrel before hand to keep that part from happening. In the worst case, the bushing could only cause the new bolt bore axis to deviate from the existing one by no more than .0025" at each end, so it wouldn't be enough of a problem that the bolt lugs bound up in the reaceways on the new axis. A larger than .705 OD reamer would surely be needed with this setup though. Isn't Manson's reamer .715? Is yours .715? The one place I can see the tapered bushing working perfectly, and maintaining the original bolt bore axis is if it were placed in the front ring from the front side where it would contact the top and bottom abutment at the same moment. I'd have one made but I don't understand how it could stay tightly fitted, as the reamer pushed it out it would begin to get slop around because of the taper. Those are the main reasons I went with the straight bushing/reamer setup GTR has made. With the straight bushings I can find the bushing size that barely fits each end, then polish the bolt bore until the next .0005 larger bushing will just fit and pass through the bore with a little bit of effort, ie. no slop. When reamed the finish is super sweet and as close to the existing bolt bore axis as one could ever be. One other way I've thought alot about would use tapered bushing, quite a bit more taper than the Manson bushings but these would be smaller in OD and slide into a collet with the same taper on the inside and straight on the outside, expanding it to fit perfectly, but straight on the outside so the reamer could push it through as it advances. Is Gordy using the Manson setup too, GTR or something different? Fun stuff! [img]/ubbthreads/images/graemlins/smile.gif[/img] [/QUOTE]
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