Abstract
Runout measurements are widely used because their results can be easily obtained. However, the meaning of information obtained from data of runout measurement is not always clear.Purpose of the present paper is to make clear the meaning of runout. From analytical and experimental results, the following conclusions are derived.(1) Runout is calculated using accumulated pitch errors on a right and the adjacent left tooth flank in a gear, namely fromfrn= (FLn-FRn) /tan ψ, ψ=π/2Z-inv α0+tan α-2x tan α0/Zwhere FLn and FRn are accumulated pitch errors on both flanks, Z is the number of teeth, α0 is standard pressure angle, α is pressure angle at the measuring point and x is coefficient of profile shift.(2) Runout measurement is effective for determining the eccentricity and the errors resulting from the worm cyclic error in the gear generating machine.(3) To obtain the worm cyclic error with high magnification, it is desirable to use a feeler diameter (dB) estimated from the following equation, dB=dg· {tan (π/2J+α0) - (π/2J-π/2Z+tanα0+2xtanα0/Z)} where dg is base circle diameter and J is number of waves in worm cyclic error.
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