Why V-Bit Geometry Drives Depth and Width Together
A V-bit cuts a groove whose width and depth are locked together by the bit's included angle, so once you fix the angle, choosing either the depth or the width automatically determines the other. A narrower included angle like 30 or 60 degrees produces a deep, narrow groove for a given width, while a wide angle like 90 or 120 degrees produces a shallow, broad groove, which matters for sign lettering, V-carving, and chamfer work where the visual proportions depend on this relationship.
Watch the Flat-Bottom Limit on Real Bits
Real V-bits aren't infinitely sharp points, they have a small flat tip or a finite minimum diameter, and once a cut goes deep enough that the groove width would be narrower than that tip, the bit stops carving a clean V and starts cutting a flat-bottomed channel instead. Checking the max depth before flat against your design depth avoids design or carving lettering that looks subtly wrong because the deepest points went flat instead of pointed.
Matching Bit Angle to the Job
Sign makers and V-carvers often keep a 60-degree bit on hand for fine detail and a 90-degree bit for faster, shallower clearing, since the angle is really a tradeoff between carving depth, surface finish, and how much material the bit has to remove per pass.