The hardest part of making the cherry is setting the teeth, fine file work. To make the ball cherry itself is actually quite easy and precise to whatever diameter you want. First decide what size you desire. Upset a piece of round tool steel and on the anvil and start shaping it into the shape of a ball off the edge of the anvil. You will need to reheat several times and probably upset the piece a few more times to forge as close to possible the size you want, but do leave it oversized some. With practice you can forge and very close to a round ball. After the ball is forged carefully draw out the shaft being careful right next to the head and round the shaft and then finish the rest of the shank as you desire. To cut the cherry to the exact size you want take another piece of tool steel 3/8"x1" is enough. Come from one edge a half inch and drill a hole and then ream exactly to desired size. On the underneath side of the hole file or countersink the hole to within about.040" from the top. Then from the center line of the hole on the top side cut the width for the diameter of the shaft you want and file the underside of that as well and then harden the steel. Take your newly forged and annealed cherry and chuck it into and handrill/brace whatever you prefer and with downward pressure while spinning the piece run it down thru the plate you made which in essence is a stationary mill. This will cut a perfectly round ball to whatever diameter you make it and will mill the shaft at the same time keeping everything perfectly centered. Then the work comes with needle file and setting in the teeth then harden.
Mark brier
Nice job describing the process. THanks
Bill Large had a lot of these "cherries" he and others made and as long as
all the cutting edges point in the same direction it will work fine.
I have made oval shaped rotary files to shape the interior of a pan on a
flintlock and made no effort to index them,only made sure all the cutting
surfaces were right hand rotation.In other word,a "cherry" by another
name which is a rotary file.
Bob Roller