Join Date: Sep 2005
Location: Sydney Australia
Re: Why not 2 curved Edges on a Trem knife?
Well, that's a pretty easy one to answer - if both knife edges were curved, the post spacing would have to be incredibly exact, and incredibly consistent from guitar to guitar, otherwise the trem wouldn't sit correctly on the studs - one curved knife edge effectively locks the lateral position of the bridge and stops it from moving sideways, while the straight knife edge allows for a little bit of inconsistency and error in the positioning of the posts.
I don't know if the curved edge is more durable or not (as both knife edges ina perfect world would kiss the post on exactly one atom....), however i would imagine it is harder, hence more costly to machine a good curved knife edge than a straight one.