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I knew there had to be an M&M in there somewhere...Kevin
I don't have a store bought reamer in .047" (1.2mm), which is the size needed for the crankshaft bore, so I made upa little shop reamer using hardened pivot wire. These are usually called "D" reamers, or D-bits. Normally,for a larger size it would be made up from drill rod, the end machined to make the cutting edge, then hardened.For this one I made it in a kind of half lozenge shape using an india stone to grind away the basic shape.
Dean,Is this "pivot wire" the same as the "piano wire" that I'd find in a local hobby shop?Alan
Do you use any kind of magnifying devices when you are doing this type of stuff?