The shank of the reamer is indicated by the letter O. It is provided with a taper of 30 degrees at the end. Upon this shank is a lock nut A which may be turned by means of a spanner wrench.

Back taper: The back taper is a slight decrease in diameter, from front to back in the flute length of reamers. Body: The body is: 1) The fluted full diameter portion of a reamer, inclusive of the ...

This is the kind of cheap tapered reamer tool I have used, which cuts in soft metals without problems. Black Beard Projects. Wood Tapered Pins Jig Made From Aluminum Muffin and Razor Blade.