I made a simple boring bar. There's a cross hole reamed to 3/16", a #10-32 setscrew in the center and a short bit made fron a broken end mill. I set the tool to cut the 5/16" radius. (3/8" bar diameter+1/8" tool sticking out of bar, for a circular sweep of 5/8")
I did a test piece in aluminum, feeding in then down, progressively.
Final cut.
Radius gage fits perfectly.
Nick,
ReplyDeleteI am getting ready to try something like this. Is the cutter a piece of steel that you ground and then heat treated?
Rick Kernell
He wrote that his tool bit was made from a broken 3/16” diameter end mill. Sharpen as necessary on a bench grinder.
Delete