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Rifles, Reloading, Optics, Equipment
Gunsmithing
Re contouring a barrel blank
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<blockquote data-quote="J E Custom" data-source="post: 1447527" data-attributes="member: 2736"><p>I countour on a Lathe and dont want to sand or grind at all on the lathe because of the abraisave dust that gets on everthing. It will excelerate wearing of ways, lead screws and anyother moving parts. If I have to do any sanding or grinding, I cover the ways and lead screws with paper towels to keep the grit off my lathe and remove it very carefully</p><p>when done.</p><p></p><p>This requires specal tooling and spindle speeds to end up with a finished cut that needs no sanding or grinding. Mostly, I use carbide tools for ruffing and high speed tools for finishing. if everything is done right, the barrel will end up with a very nice finish and won't require any sanding or grinding.</p><p></p><p>The last contouring cut requires a .005 to .007 thousandths cut with a specially ground high speed tool. (Carbide doesn't like to take this light of a cut and will not do as nice of a finish) so the high speed tool is the best choice. I have not tried the shear grind on the finish tool yet, but If anyone has,comments would be welcome . The reason the manufactures sand/grind the finish on there barrels is because they use carbide tools to contour and take large cuts for speed, so the finished cut is less than desirable and has to be sanded. It is common to find flat spots where the sanding was not done correct on some custom barrels. You can feel or the dial indicator will show these places when rotated between centers even though the eye cannot see them.</p><p></p><p>Grinding tools has almost became a lost art with all of the pre-ground tools and CNC machines and I find it very satisfing when I grind a tool for a special use and it does realy well.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1447527, member: 2736"] I countour on a Lathe and dont want to sand or grind at all on the lathe because of the abraisave dust that gets on everthing. It will excelerate wearing of ways, lead screws and anyother moving parts. If I have to do any sanding or grinding, I cover the ways and lead screws with paper towels to keep the grit off my lathe and remove it very carefully when done. This requires specal tooling and spindle speeds to end up with a finished cut that needs no sanding or grinding. Mostly, I use carbide tools for ruffing and high speed tools for finishing. if everything is done right, the barrel will end up with a very nice finish and won't require any sanding or grinding. The last contouring cut requires a .005 to .007 thousandths cut with a specially ground high speed tool. (Carbide doesn't like to take this light of a cut and will not do as nice of a finish) so the high speed tool is the best choice. I have not tried the shear grind on the finish tool yet, but If anyone has,comments would be welcome . The reason the manufactures sand/grind the finish on there barrels is because they use carbide tools to contour and take large cuts for speed, so the finished cut is less than desirable and has to be sanded. It is common to find flat spots where the sanding was not done correct on some custom barrels. You can feel or the dial indicator will show these places when rotated between centers even though the eye cannot see them. Grinding tools has almost became a lost art with all of the pre-ground tools and CNC machines and I find it very satisfing when I grind a tool for a special use and it does realy well. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Re contouring a barrel blank
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