Picked up a new tenon saw from ebay (on the smallish side)--will use it for hardwood tenons/dovetails/ripping. I have always sharpened my tenon/dovetail saws for a rip cut--and with a 8* rake angle from 90* (so 82 and 102 degree's). However, as I need to sharpen this saw, I am going to experiment and put the rake angle at 90* ( no rake angle at all). For thoses who have done this--wht are you're thoughts on having a straight 90 degree cutting tooth?