Here are my results.
For a given weapon, you will have a max damage, based on several things that contribute.
I will call max damage, max_dmg.
The damage bonus a weapon gets, I will call dmg_bonus.
The base damage of a weapon, I will call base_weap_dmg.
Here is a list of weapon damage bonuses:
http://lucy.allakhazam.com/dmgbonus.html
For critical hits, weapons in primary (difference for offhand, it gets no damage bonus component).
Min_Crit_dmg = 1.7 * base_weap_dmg + 8 + dmg_bonus
Max_Crit_dmg = (max_dmg - dmg_bonus) * 1.7 + 8 + damage_bonus
For crippling blows (no dmg_bonus for offhand):
Min_Crippling_blow_dmg = 2.9 * base_weap_dmg + 13 + dmg_bonus
Max_Crippling_blow_dmg = (Max_Crit_dmg - dmg_bonus) * 1.7 + dmg_bonus
Whew ....
H