Posted: 5/17/2010 5:57:09 PM EDT
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Would this work?
Running a line of barrels that have polygonal rifling and are chrome lined just slightly too small (say .219) and then Extrude-hone the bore to get a final diameter of .223? This should ensure a perfect bore diameter and it would also micro-hone and polish the bore. Has this been tried before? |
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The groove diameter for modern .22 centerfire barrels should be 0.224 inches or thereabouts, so any broaching operation you do needs to be done before the barrel is rifled.
[I re-read the comment about using polygonal rifling.] I think what you're really wanting to do is essentially hob the bore with an extremely hard, smooth, and round tool. Might work. However, I want a barrel with some choke. Right now that is added by hand lapping, which also smooths and circularizes the bore. I'll be interested to hear what others add. |
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Quoted:
I've used the Extrudehone process on parts and it is FAR from exact...no way to know how much you are removing nor get an even removal of material. Yeah and I concur, but there is a process that has a tolerance of ± .0001 for micro polishing. I just can't remember the name and Extrude-hone is the same process, just not as precise 
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