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Rifles, Reloading, Optics, Equipment
Gunsmithing
Reamer resharp and reshape - different from maker
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<blockquote data-quote="shortgrass" data-source="post: 1115239" data-attributes="member: 24284"><p>Even tool makers have a 'tolerance' they work within. Sharpening the body and shoulder of a chambering reamer is easy to visuallze, necks & throats are a bit more. The forward end of the neck portion of the reamer has an angle similar to that of a chucking ( a reamer for a straight hole) reamer. That's the part that does the most 'neck' work and the part that is sharpened. Some but not all chamber necks have slight taper, so grinding can be done there, too (slightly bigger at the back than at the front). On those that are straight, and are a SAAMI speced tool very little can be done beyond removing a half thousanth from the OD one time. It depends on the reamer and the allowable SAAMI spec of the chamber it cuts. By sharpening that angle at the end of the neck it makes it possible to sharpen the throat so the neck has been moved back the appropiate amount. Sharpening the shoulder makes the neck longer. The length of the neck is shortened by sharpening. Make sense? The tool maker is dealing with tiny areas and even smaller tolerances. Chambering reamers are usually used at reduced speeds and feeds compared to 'straight hole' production tooling, so not much needs to be removed to 'freshen' them.</p></blockquote><p></p>
[QUOTE="shortgrass, post: 1115239, member: 24284"] Even tool makers have a 'tolerance' they work within. Sharpening the body and shoulder of a chambering reamer is easy to visuallze, necks & throats are a bit more. The forward end of the neck portion of the reamer has an angle similar to that of a chucking ( a reamer for a straight hole) reamer. That's the part that does the most 'neck' work and the part that is sharpened. Some but not all chamber necks have slight taper, so grinding can be done there, too (slightly bigger at the back than at the front). On those that are straight, and are a SAAMI speced tool very little can be done beyond removing a half thousanth from the OD one time. It depends on the reamer and the allowable SAAMI spec of the chamber it cuts. By sharpening that angle at the end of the neck it makes it possible to sharpen the throat so the neck has been moved back the appropiate amount. Sharpening the shoulder makes the neck longer. The length of the neck is shortened by sharpening. Make sense? The tool maker is dealing with tiny areas and even smaller tolerances. Chambering reamers are usually used at reduced speeds and feeds compared to 'straight hole' production tooling, so not much needs to be removed to 'freshen' them. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Reamer resharp and reshape - different from maker
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