Happy New Year ! 'Can't argue about getting the results you wanted . . . BUT - I'd suggest that you grind the leading edge 'lips' of the reamer to 45 degrees , & relieve them as you would a drill bit - * Just as a 'store bought' reamer is made . . . The lead angle will produce a positive cutting action , whereas the cutting edges on the flutes will produce more of a 'scraping' action ! The cutting forces on the 'lips' is much less than the force of the scraping by the flutes , & should produce a much smoother bore . You'll find that with the 45 degree 'lead' angle , that it will be very easily touched up when it begins to dull ; & will generally just take a little honing to get a keen edge - & should last a very long time ! Good job for simplicity's sake !
Happy New Year ! 'Can't argue about getting the results you wanted . . . BUT - I'd suggest that you grind the leading edge 'lips' of the reamer to 45 degrees , & relieve them as you would a drill bit - * Just as a 'store bought' reamer is made . . . The lead angle will produce a positive cutting action , whereas the cutting edges on the flutes will produce more of a 'scraping' action ! The cutting forces on the 'lips' is much less than the force of the scraping by the flutes , & should produce a much smoother bore .
You'll find that with the 45 degree 'lead' angle , that it will be very easily touched up when it begins to dull ; & will generally just take a little honing to get a keen edge - & should last a very long time !
Good job for simplicity's sake !
Ditto on the cutting tip, same method for a semi circular (1/2 milled) or a taper (1/2 milled ) reamer.