I've just got a carbide disc type cutter I'm using with my home grown articulated rig. I've only hollowed two forms with it and I'm getting tearout and chattering. i'm presenting it basically right at the center line and in a horizontal or nearly horizontal orientation. I'm working dry mesquite. the blade seems quite dull already but it seems to me carbide should have stayed sharp longer. What are your thoughts on this? Can I sharpen this thing? I'm assuming I can just lay it flat on a diamond sharpener and move it around with a fingertip?