Is it correcr to measure the gap between top of the pinion tooth and bottom of the gear OR the gap between the top of the gear tooth and bottom of pinion?
ROOT CLEARANCE.—The designed root
clearance with gear and pinion operating on their
designed centers can be obtained from the
manufacturer's drawing or blueprint. The actual
clearance can be found by taking leads or by
inserting a long feeler gage or a wedge gage. This
clearance should check with the designed
clearances. When the root clearance is con-
siderably different at the two ends, the pinion and
gear shaft are not parallel. Some tolerance is per-
mitted, provided that there is still sufficient
backlash and that the teeth are not meshed so
closely that lubrication is adversely affected.
My first thought is that unless you are checking the gears on a checking stand you are going to be hard pressed to differentiate or even care. You are probably going to be cheek to metal with the gear in question while you try to manipulate a set of feeler gauges with one hand.
You are more than likely going to be concerned with the alignment end for end than you are which element you are dealing with. Unless of course this is an exercise.
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root clearance
Re: root clearance
