What is the difference between total runout and runout?


Updated: 2nd October 2019

Total runout is a composite tolerance, that is applied to an entire surface, that restrains geometric variation (so this means it controls variation in straightness circularity, coaxiality, tapers, angularity and profile). To put it another way, runout control the location of a circular feature relative to its axis.

Furthermore, what is total indicator runout?

Total indicated runout (which before the days of the double arrow GD&T symbol was specified on drawings by writing "T.I.R.") is measured by setting up a part so that it rotates about a particular axis, then a dial indicator is used to measure a surface of interest as the part is rotated.

What is runout of a shaft?

On rotating machinery, runout is defined as the degree to which a shaft or coupling deviates from true circular rotation. Every shaft or coupling has a center or rotation, or centerline. If runout is severe, it can cause many problems with equipment, such as: Excess vibration.

What is the symbol for runout?

GD&T Runout Definition. In GD&T, runout tolerance is used to control the location of a circular part feature relative to its axis. This is different than circularity, which controls overall roundness.
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