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Rifles, Reloading, Optics, Equipment
Gunsmithing
Shear grinding Lathe tools
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<blockquote data-quote="livetohunt" data-source="post: 1471730" data-attributes="member: 100535"><p>For me personally when I'm trying to get a good finish on stainless, a standard tool room large will have the rpms to turn at the speed I would want, but when turning chromoly, the toolroom lathe at work peaks at 1800 rpm and I will struggle to get a decent finish on chromoly. The other manual has the rpms I would want, but too short.</p><p></p><p>I really only use carbide bits when turning steel and I like to rough with a .03 rad insert. Ideally, your pass would be .06" off the diameter. At this point your maximizing the tool life of the insert because that is how they are Designed. So if I am turning something that I will want a very good finish and minimal deflection, I step down to a much smaller radius insert, such as a .008 or .004. As mentioned above, a larger tool radius puts more stress into the part. So a smaller tool radius for a finish cut works better. Leave yourself the correct amount of material to take as a Finish pass based on your finish tools radius.</p><p></p><p>Just my 2 cents. </p><p></p><p>I'm more of a mill guy so I'm far from an expert on turning. I will say I'm always jealous how good lathe finishes look vs. a milled finish!</p></blockquote><p></p>
[QUOTE="livetohunt, post: 1471730, member: 100535"] For me personally when I’m trying to get a good finish on stainless, a standard tool room large will have the rpms to turn at the speed I would want, but when turning chromoly, the toolroom lathe at work peaks at 1800 rpm and I will struggle to get a decent finish on chromoly. The other manual has the rpms I would want, but too short. I really only use carbide bits when turning steel and I like to rough with a .03 rad insert. Ideally, your pass would be .06” off the diameter. At this point your maximizing the tool life of the insert because that is how they are Designed. So if I am turning something that I will want a very good finish and minimal deflection, I step down to a much smaller radius insert, such as a .008 or .004. As mentioned above, a larger tool radius puts more stress into the part. So a smaller tool radius for a finish cut works better. Leave yourself the correct amount of material to take as a Finish pass based on your finish tools radius. Just my 2 cents. I’m more of a mill guy so I’m far from an expert on turning. I will say I’m always jealous how good lathe finishes look vs. a milled finish! [/QUOTE]
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