I found a source for .04" thick O1 tool steel to make my next batch of blades from. I can harvest about 21 sets of blades from a 6" x 10" long piece of stock. After water jet cutting I will heat treat and temper the steel to a Rockwell hardness in the upper 50's. An order has been place.


At the same time I made the rearward blades a bit larger going from 1 1/8" wide to 1 3/16" and added some venting. The leading blade went from 1" wide to 7/8" .