homebrew .357 wrote:just to make sure I`M on the right track there`s reamers have a relief cut close up to the sharp cutting edge , how close to the edge , I`M at ( 0.034" ) back from it, is this ok or a bit more.
There's two schools of thought in reamers. One of them, chucking reamers, the periphery of the reamer is circular ground (like yours right now) with a narrow land. The land is intended to guide the reamer, which cuts
on the end only.
The second school of thought is a reamer that's intended to cut on the sides (like a hand reamer). Such a reamer must have almost no land, so the flute can cut on the periphery. The greater the land size, the tougher it's going to be to get the reamer to cut. Typically, such a reamer is ground with a primary and secondary relief, with the primary relief creating a sharp edge at the front (the flute). This relief will appear to you as being a land, but it is not. The grind provides for a modest amount of relief, so the reamer makes contact ONLY at the cutting edge. Such a reamer will cut with the least amount of effort.
So then, to produce a reamer that will perform well, what you'd best do is to sharpen the reamer on a finger, after heat treat. That would correct any errors in form that might result from heat treat, as heating and cooling metals tends to relax pent up stress, resulting in at least minor movement.
This grinding operation would require a cutter grinder, one that has the capability of turning the table and suspending the reamer between centers, so it can follow the finger properly. That would apply to all forms that are not a straight cylinder, such as a cartridge case. That's the ideal setup. If you don't have access to such a setup, I think you'd be best served by making a test reamer and experimenting to see how close you can get to the cutting edge, to see if you can find a width of circular grind that will perform to your satisfaction. Mind you, I'm not suggesting that you can't achieve your goal without grinding--just that grinding will correct minor issues that may spell the difference between a reamer that performs as expected, or one that yields a poor result.
Hope you guy`s are keeping warm over there,
here the sun is shining,
great, Cheers, Homebrew.357.
Heh! Warm is a relative term! We, here on the left coast of the US, are not having it too bad, but the right coast and Midwest are being slammed pretty hard right now. Record low temps and considerable snow. Our thoughts are with those folks.
Harold
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,this is going to be a long build, I have the plans for the Sharps Quigley 45-70-110 ,may have to buy in some parts. 
,afew more pic`s ,Homebrew.357.
