Hi There

You don't need a cutter grinder, you can do it on a bench grinder..

Turn a bit of round bar to the correct diameter of the radius you require.

Hand grind a tool to the aproximate radius.

Put the round bar in the bench drill.

Put some grinding paste on it, something like they used on car valves in the olden days.

Use this to lap the tool to the correct radius.

This was how we did it in the olden days.

regards David

Ah thats better the radius expressed as a length not an angle I can see what you mean now and your methods.

Easiest way would be to put a bit of 1/4" silver steel in the lathe, face off and then set your topslide to cut an angle of say 10deg. turn say 1/4" length of the bar to this taper until the end is 0.220 and getting smaller as it gets nearer the chuck. Now part off the end 1/8" thick.

This will give you a disc 0.220" dia with clearance all round, solder to your MS shank and you now have a round tipped tool with the correct radius on teh end that looks like a lolly pop.

Now use this tool to turn your taper reamers and it will give the correct flare at the end, trying to make just a straight taper reamer and then another for the bell will not give the smoothest transition.

J

EDIT

turn the silversteel like this and part off the end, click to see it bigger

Imagine my tip is that disc soldered to your shank, turn the taper & belmouth as one then use to make the reamer

Edited By JasonB on 29/04/2012 12:20:14