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Originally Posted by katana
are there common blade edge angles ....do they vary even with weapons that have similar profiles ?
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They vary even over the same weapon. Just measured a knife/sword. Flat grind, distal taper, reverse profile taper (i.e, the blade gets thinner and wider towards the tip). Edge angle is 22 degrees where the edge starts near the hilt, and drops down to under 4 degrees near the tip. (There are many small chips near the tip.)
The same effect, though not so extreme, occurs with convex ground weapons/tools with the same kind of taper (or just distal taper, or just reverse profile taper). E.g., various goloks.
Often enough, the blade section itself changes along the blade. Many fighting swords end in very thin (and still wide) tips, usually convex ground, which can have very low edge angles. E.g., the broad-bladed Turkish kilij, some tulwars, parang nabur, lots of European military sabres, oxtail dao, some jian.