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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning.. fast vs slow, does it matter?
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<blockquote data-quote="Canadian Bushman" data-source="post: 992117" data-attributes="member: 41122"><p>The appropriate SFM to cut brass with HSS is pretty high ( aprx. 2-300 sfm / 2300-3400rpm for a .330 dia). Your limiting factor in this case it the heat generated by the brass spinning on the mandrel. </p><p></p><p>Brass heat soaks very well and will get hot in a hurry if spun too fast or not lubed properly. When the brass starts to get to hot it will swell causing increased friction on the mandrel and inconsistencies in neck thickness. </p><p></p><p>Your best bet is to size the brass just a few ten thousandths under the diameter of the mandrel, run at about 300-500 rpm, and use a generous amount of heavy oil or case lube. </p><p></p><p>I personally do this in a Bridgeport mill, with the case chucked in a collet, and i run every case twice.</p><p></p><p>If i could figure out how to post a video i would show my setup.</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 992117, member: 41122"] The appropriate SFM to cut brass with HSS is pretty high ( aprx. 2-300 sfm / 2300-3400rpm for a .330 dia). Your limiting factor in this case it the heat generated by the brass spinning on the mandrel. Brass heat soaks very well and will get hot in a hurry if spun too fast or not lubed properly. When the brass starts to get to hot it will swell causing increased friction on the mandrel and inconsistencies in neck thickness. Your best bet is to size the brass just a few ten thousandths under the diameter of the mandrel, run at about 300-500 rpm, and use a generous amount of heavy oil or case lube. I personally do this in a Bridgeport mill, with the case chucked in a collet, and i run every case twice. If i could figure out how to post a video i would show my setup. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning.. fast vs slow, does it matter?
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