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Rifles, Reloading, Optics, Equipment
Gunsmithing
Back Spindle Spider
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<blockquote data-quote="Trickymissfit" data-source="post: 833465" data-attributes="member: 25383"><p>4150 pretreat steel will nitride harden very well, if you decide to make one that won't show signs of use. 8620 can be carburized and hardened. Machines very well, and is very common. The free machine steel used in screw machines also works very well, and I've done a lot of government jobs with it. Plus it's easy to come by. Some of it uses lead in it, and some of it has a high sulfur content to aid machining. Nice thing about 4150 is that you can also buy it in shapes. Such as tubes and hexes & squares. Most of all the big players now sell it in a finished and ground O.D. that will usually be about .002" under the advertised O.D. (1.998" = 2"). It machines well, and is semi hardened out of the box. (28-32RC)</p><p> </p><p>I've seen a couple guys rig up a small chuck on the back side of the lathe spindle. This is easier than you think to do. Another setup I've seen once or twice used the standard Hardingh Brothers lathe collets in a head similar to what they use on surface grinders</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 833465, member: 25383"] 4150 pretreat steel will nitride harden very well, if you decide to make one that won't show signs of use. 8620 can be carburized and hardened. Machines very well, and is very common. The free machine steel used in screw machines also works very well, and I've done a lot of government jobs with it. Plus it's easy to come by. Some of it uses lead in it, and some of it has a high sulfur content to aid machining. Nice thing about 4150 is that you can also buy it in shapes. Such as tubes and hexes & squares. Most of all the big players now sell it in a finished and ground O.D. that will usually be about .002" under the advertised O.D. (1.998" = 2"). It machines well, and is semi hardened out of the box. (28-32RC) I've seen a couple guys rig up a small chuck on the back side of the lathe spindle. This is easier than you think to do. Another setup I've seen once or twice used the standard Hardingh Brothers lathe collets in a head similar to what they use on surface grinders gary [/QUOTE]
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Back Spindle Spider
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