There is obviously some confusion in this thread due to the same name applied to a wood planner and a metal planner. They are designed very differently and thus operate very differently.
It would be very inappropriate to use a planner gage to attempt to set the cutting blades of a wood planner or a jointer. As previously pointed out their blades are quite hard in order to maintain a sharp cutting edge. The planner gage is also quite hard, but not as hard as a planner blade. In any case both the cutting blade and the planner gage would be damaged using this method.
There are various tools to use in setting these blades, but nothing will beat a test indicator on a surface gage. All of the other methods employ feel to some extent and thus some error, which is eliminated by using the indicator & surface gage.
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