04-12-2014, 10:45 PM
Finished up the screw for Darren by milling the 6mm wide x 20.25mm long keyway and putting in the 5mm hole called for on his print.
The keyway was a good exercise for me with the conversational Prototrak control on my Alliant milling machine. Because I don't have a 6mm end mill, I used a 4-flute solid carbide 13/64" (0,2031") end mill I had kicking around and used cutter diameter compensation to make it cut 6mm (.2362") wide. It took a couple of passes to get right, largely due to not having a reliable method of gauging the width. In the end I used the 6mm shank of a 1/8" solid carbide drill I have as my gauge, making that a very snug fit. I presume that a 6mm key will be on the small size, so it should fit with a tap in.
The keyway was a good exercise for me with the conversational Prototrak control on my Alliant milling machine. Because I don't have a 6mm end mill, I used a 4-flute solid carbide 13/64" (0,2031") end mill I had kicking around and used cutter diameter compensation to make it cut 6mm (.2362") wide. It took a couple of passes to get right, largely due to not having a reliable method of gauging the width. In the end I used the 6mm shank of a 1/8" solid carbide drill I have as my gauge, making that a very snug fit. I presume that a 6mm key will be on the small size, so it should fit with a tap in.