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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hand Lapping Barrels
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<blockquote data-quote="J E Custom" data-source="post: 1347056" data-attributes="member: 2736"><p>Lapping is not something that should be attempted by someone with little or no experience because of the many different scenario's the barrel presents and the requirements to do a expert job.</p><p></p><p>First, There is the evaluation of what's required by using a good bore scope. Next you would need to decide what size and how many Lapps</p><p>to make and what abrasive grits to use to lap the bore without destroying it. Then comes the actual technique of lapping to prevent oversizing the muzzle and throat. (Custom barrel that are lapped, are done so in the blank form so the ends can be removed far enough to get back to uniform diameters.) this is the reason that gunsmiths are required to take almost 1" off the muzzle of the new blank. The chamber end is not a problem because the chamber will remove that part of the enlarged bore.</p><p></p><p>If a barrel is already chambered and crowned the muzzle and the throat can suffer if not done correctly. If you have the tools to accurately measure the bore on both ends you can monitor the progress, if not you are guessing and have a good chance of ruining a good barrel.</p><p></p><p>By the way the bore is normally the tightest at the muzzle because the barrel maker measures the bore diameter before contouring and marks the muzzle end. Some even saw cut the muzzle to make the smith remove this oversized portion.</p><p></p><p>If you want to try it, By all means do but practice on a take off barrel </p><p>and measure the results.</p><p></p><p>PS: there is no magical number of strokes to a good lapping job, just the number it takes to reach a "Reasonable" condition/finish. with the grit and type used in the compound. I prefer 800 to 1500 and typically use two or three laps.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1347056, member: 2736"] Lapping is not something that should be attempted by someone with little or no experience because of the many different scenario's the barrel presents and the requirements to do a expert job. First, There is the evaluation of what's required by using a good bore scope. Next you would need to decide what size and how many Lapps to make and what abrasive grits to use to lap the bore without destroying it. Then comes the actual technique of lapping to prevent oversizing the muzzle and throat. (Custom barrel that are lapped, are done so in the blank form so the ends can be removed far enough to get back to uniform diameters.) this is the reason that gunsmiths are required to take almost 1" off the muzzle of the new blank. The chamber end is not a problem because the chamber will remove that part of the enlarged bore. If a barrel is already chambered and crowned the muzzle and the throat can suffer if not done correctly. If you have the tools to accurately measure the bore on both ends you can monitor the progress, if not you are guessing and have a good chance of ruining a good barrel. By the way the bore is normally the tightest at the muzzle because the barrel maker measures the bore diameter before contouring and marks the muzzle end. Some even saw cut the muzzle to make the smith remove this oversized portion. If you want to try it, By all means do but practice on a take off barrel and measure the results. PS: there is no magical number of strokes to a good lapping job, just the number it takes to reach a "Reasonable" condition/finish. with the grit and type used in the compound. I prefer 800 to 1500 and typically use two or three laps. J E CUSTOM [/QUOTE]
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