CASCADE — Agriculture and industrial arts teachers from across Montana spent part of their summer learning how to make knives — sharpening their professional skills in the process. Tilleman is the OPI Agriculture and Natural Resources Education Specialist and a former ag teacher at Cascade. George Franko, another former vocational ag teacher at Cascade, led the two-day class. For Franko, who makes knives as a hobby, what the teachers learn goes beyond the grinders and drill presses. It's the skill of training in steel, of grinding steel and laying it out," Franko said.