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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How many cuts ??
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<blockquote data-quote="shortgrass" data-source="post: 1179849" data-attributes="member: 24284"><p>Most chambering reamers used outside of the 'factories' get "rubbed to death". The muzzle flush for gunsmith chambering changed a lot. I still don't turn at calculated SFM because of the small relative size & weight of the lathe. It's not a 'production machine', like a W&S #3 is. But with the flush, RPM is up around 200 depending on 'what chamber',,,, and let 'er eat just as fast as it wants to cut. Feeding by hand, it's easy to find that feed rate and not be 'pushing it'. Dark threading oil mixed with Tap Magic Pro-Tap w/EP Extra is my preferred coolant/lubricant. And, that's the key. Those higher RPMs can be turned because of the forced coolant/lubricant so the work and the tool don't heat-up. Flushes the cuttings, which if left in the flutes, would generate heat,,,, one of the main enemies of any cutting tool, be it a simple turning too, a twist drill or a chambering reamer. Larger production machines could turn for chambering faster and with 'peck cycles' reducing the time it'd take to finish a chamber. They must run those reamers, in the factories, pretty hard 'cause some of those production cut chambers look pretty rough!</p></blockquote><p></p>
[QUOTE="shortgrass, post: 1179849, member: 24284"] Most chambering reamers used outside of the 'factories' get "rubbed to death". The muzzle flush for gunsmith chambering changed a lot. I still don't turn at calculated SFM because of the small relative size & weight of the lathe. It's not a 'production machine', like a W&S #3 is. But with the flush, RPM is up around 200 depending on 'what chamber',,,, and let 'er eat just as fast as it wants to cut. Feeding by hand, it's easy to find that feed rate and not be 'pushing it'. Dark threading oil mixed with Tap Magic Pro-Tap w/EP Extra is my preferred coolant/lubricant. And, that's the key. Those higher RPMs can be turned because of the forced coolant/lubricant so the work and the tool don't heat-up. Flushes the cuttings, which if left in the flutes, would generate heat,,,, one of the main enemies of any cutting tool, be it a simple turning too, a twist drill or a chambering reamer. Larger production machines could turn for chambering faster and with 'peck cycles' reducing the time it'd take to finish a chamber. They must run those reamers, in the factories, pretty hard 'cause some of those production cut chambers look pretty rough! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How many cuts ??
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