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Rifles, Reloading, Optics, Equipment
Gunsmithing
GO824 Lathe FLUSH SYSTEMS
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<blockquote data-quote="shortgrass" data-source="post: 3042762" data-attributes="member: 24284"><p>SFM and feed rate are 2 different things. SFM is the speed which a cutter is used at, how has the tool or spindle is turned at. Feed rate is "chip load", how many thou of an inch per cutting edge of the tool. SFM can probably be explained better on YouTube or Wiki than I could. On a lathe, when cutting on the outside, the circumference of the bar. On the inside ( a hole) the diameter of the cutting tool. A person could be turning at the proper speed, but lightly feeding and that will dull the tool (rubbing and not cutting enough to properly utilize the capability of the cutting tool). With so many 'doing their own work' these days, I'd speculate that more reamers are dulled from not enough feed/speed than are dulled by the number of chambers they have cut. Rubbing creates friction,,, friction creates heat, heat is one of the destroyers of cutting tools. That is one reason why carbide has become so desirable, you don't have to learn how to grind a turning/threading tool, and it (carbide) can stand much more heat than HS tooling ever could.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 3042762, member: 24284"] SFM and feed rate are 2 different things. SFM is the speed which a cutter is used at, how has the tool or spindle is turned at. Feed rate is "chip load", how many thou of an inch per cutting edge of the tool. SFM can probably be explained better on YouTube or Wiki than I could. On a lathe, when cutting on the outside, the circumference of the bar. On the inside ( a hole) the diameter of the cutting tool. A person could be turning at the proper speed, but lightly feeding and that will dull the tool (rubbing and not cutting enough to properly utilize the capability of the cutting tool). With so many 'doing their own work' these days, I'd speculate that more reamers are dulled from not enough feed/speed than are dulled by the number of chambers they have cut. Rubbing creates friction,,, friction creates heat, heat is one of the destroyers of cutting tools. That is one reason why carbide has become so desirable, you don't have to learn how to grind a turning/threading tool, and it (carbide) can stand much more heat than HS tooling ever could. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
GO824 Lathe FLUSH SYSTEMS
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