Here is the latest project for the shop. I have a good single bit fly cutter with an r8 shank that works great
in my mini mill. It was built using Rossbotics plans:http://www.homemadetools.net/forum/f...585#post124734
I wanted to make one a bit larger and with two bits to see if it would provide an even smoother cut.
Well this is the result and it provides a glass smooth finish, at least by touch. You can still see tool marks but you
can not feel them. This may be my best fly cutter for a smooth finish.
It is 2.5" in diameter with a 5/8" shank. The shank is drill rod and the fit is interference by about .002".
I wanted to make sure it would not turn on the shank so I added two set screw cotters. The cotters
are 1/4-20 and secured with blue loctite. As Tom Lipton says, "nothing built too strong ever broke".
The cutter disc was placed on the shank prior to final finishing on the lathe. Lathe bits are 1/4" and are a slip fit in the grooves.
10-32 allen cap screws secure the bits. The cutter disc is .750" thick and made from a chunk of hot rolled steel. Having a square 5C collet block really helped to get all of the milling and drilling lined up.
I think it should out last me!