what is runout? how it is measure? which is the refrence?
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Answer Posted / muhammad suhan
Circular / Radial Run-out:
Circular run-out or simply run-out is an error in the form
of mechanical components like cylindrical surfaces, shafts,
rotors etc. By definition, run-out refers to error of
roundness or form measured along a specified sectional plane
from the axis.
Mostly, this feature is measured using dial indicator while
the part or component is being clamped in the headstock of
lathe machine (for example). When measured using dial
indicator, two extreme values are obtained for a specified
sectional plane. Mathematically, the difference of these
extreme values is circular run-out.
Axial / Total Run-out:
When circular or radial run-out is measured along the axis
of rotation or simply axis of the part or component, then it
is called Axial or total run-out. To measure this, selection
of planes is necessary. For long components, it is advisable
to separate sectional planes equidistant almost 100 mm.
Mathematically, axial run-out is calculated as follows: -
first measure circular run-out along each sectional planes,
then look for extreme values i.e. maximum and minimum values
among all circular run-out readings so obtained using dial
indicator. The difference of extreme values along the axis
is called axial or total run-out.
suppose, there are 4 sectional planes selected for a shaft.
Readings of circular run-out obtained using dial indicators are:
Section Plane -1: Max:1.5, Min: 0.8
Section Plane -2: Max:1.6, Min: 0.7
Section Plane -3: Max:1.3, Min: 0.9
Section Plane -4: Max:1.45, Min:0.11
Maximum value among above values: 1.6
Minimum value among above values: 0.7
Axial Run-out= 1.6-0.7=0.9
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