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A

SEMINARON

TOLERANCES OFRUNOUT

By,

Robinson.P

2nd Sem, M.Tech P.D.M

N.I.E , Mysore.

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Tolerances of

Runout

Circular Runout

(ASME Y14.5M-1994, 6.7.1.2.1)

Total Runout(ASME Y14.5M-1994 ,6.7.1.2.2)

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Datum feature

Datum axis (establishedfrom datum feature

Angled surfacesconstructed arounda datum axis

External surfaces

constructed arounda datum axis

Internal surfacesconstructed around adatum axis

Surfaces constructedperpendicular to a

datum axis

Features Applicableto Runout Tolerancing

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CIRCULAR RUNOUT

At any measuring position, each

circular element of thesesurfaces must be within thespecified run out tolerance when

the part is rotated 360 degrees

about the datum axis.

Controls circularity and

concentricity of the part surface.

Controls circular elements withinthe part surface limits.

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0+ -

Full IndicatorMovement

Maximum Minimum

Total

Tolerance

MaximumReading

MinimumReading

Full PartRotation

Measuring position #1(circular element #1)

Circular Runout

When measuring circular runout, the indicator must be reset to zero at each measuring positionalong the feature surface. Each individual circular element of the surface is independentlyallowed the full specified tolerance. In this example, circular runout can be used to detect 2-dimensional wobble (orientation) and waviness (form), but not 3-dimensional characteristicssuch as surface profile (overall form) or surface wobble (overall orientation).

Measuring position #2(circular element #2)

Circular runout can only be applied on an

RFS basis and cannot be modified toMMC or LMC.

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o360 PartRotation

50 +/- 2o o

As Shownon Drawing

Means This:

Datum axis A

Single circularelement

Circular Runout(Angled Surface to Datum Axis)

0.75 A

A

50 +/-0.25

0+-

NOTE: Circular run out in this example only

controls the 2-dimensional circular elements(circularity and coaxiality) of the angled featuresurface not the entire angled feature surface

Full IndicatorMovement( )

The tolerance zone for any individual circularelement is equal to the total allowable movement

of a dial indicator fixed in a position normal to thetrue geometric shape of the feature surface whenthe part is rotated 360 degrees about the datumaxis. The tolerance limit is applied independentlyto each individual measuring position along thefeature surface.

Allowable indicatorreading = 0.75 max.

When measuring circularrunout, the indicator must

be reset when repositionedalong the feature surface.

Collet or Chuck

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As Shownon Drawing

50 +/-0.25

0.75 A

Circular Runout(Surface Perpendicular to Datum Axis)

o360 PartRotation

0+-

Datum axis A

Single circularelement

NOTE: Circular runout in this example willonly control variation in the 2-dimensionalcircular elements of the planar surface (wobbleand waviness) not the entire feature surface

The tolerance zone for any individual circularelement is equal to the total allowable movement

of a dial indicator fixed in a position normal to thetrue geometric shape of the feature surface whenthe part is rotated 360 degrees about the datumaxis. The tolerance limit is applied independentlyto each individual measuring position along thefeature surface.

Means This:


When measuring circular runout, the indicator mustbe reset when repositioned along the feature surface.

A

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0+ -


Single circular element

o360 PartRotation

Means This:

As Shownon Drawing

50 +/-0.25

0.75 A

Datum axis A

When measuring circular runout,the indicator must be reset whenrepositioned along the featuresurface.

Circular Runout(Surface Coaxial to Datum Axis)

The tolerance zone for any individual circular element is equalto the total allowable movement of a dial indicator fixed in aposition normal to the true geometric shape of the feature

surface when the part is rotated 360 degrees about the datumaxis. The tolerance limit is applied independently to eachindividual measuring position along the feature surface.

NOTE: Circular runout in this example will

only control variation in the 2-dimensionalcircular elements of the surface (circularity andcoaxiality) not the entire feature surface

A

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0+ -



o360 PartRotation

Means This:

As Shownon Drawing

0.75 A-B

Datum axis A-B

When measuring circular runout,the indicator must be reset whenrepositioned along the featuresurface.

Circular Runout(Surface Coaxial to Datum Axis)

The tolerance zone for any individual circular element is equalto the total allowable movement of a dial indicator fixed in aposition normal to the true geometric shape of the feature

surface when the part is rotated 360 degrees about the datumaxis. The tolerance limit is applied independently to eachindividual measuring position along the feature surface.

NOTE: Circular runout in this example will

only control variation in the 2-dimensionalcircular elements of the surface (circularity andcoaxiality) not the entire feature surface

Machine

center

Machinecenter

BA

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As Shownon Drawing

50 +/-0.25

Circular Runout(Surface Related to Datum Surface and Axis)

o360 PartRotation

0+ -

Datum axis B


The tolerance zone for any individual circular element isequal to the total allowable movement of a dial indicator fixedin a position normal to the true geometric shape of the

feature surface when the part is located against the datumsurface and rotated 360 degrees about the datum axis. Thetolerance limit is applied independently to each individualmeasuring position along the feature surface.

Means This:

A


When measuring circular runout,

the indicator must be reset whenrepositioned along the featuresurface.

Collet or Chuck

Stop collar

0.75 A B

Datum plane A

B

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TOTAL RUNOUT

Entire surface must lie within thespecified tolerance zone when the

part is rotated 360 degrees.

Used to control cumulativevariations of circularity,straightness, coaxiality, angularity,

taper, and profile of a surface.

Provides composite control of allsurface elements.

The complete surface is measured,and not single points, as in circularrun out.

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0+

Full IndicatorMovement

Total

Tolerance

MaximumReading

MinimumReading

Full PartRotation

-

0+ -

Total Runout

Maximum Minimum

When measuring total runout, the indicator is moved in a straight line along the feature surfacewhile the part is rotated about the datum axis. It is also acceptable to measure total runout byevaluating an appropriate number of individual circular elements along the surface while the paris rotated about the datum axis. Because the tolerance value is applied to the entire surface, theindicator must not be reset to zero when moved to each measuring position. In this example,total runout can be used to measure surface profile (overall form) and surface wobble (overallorientation).

IndicatorPath

Total runout can only be applied on an

RFS basis and cannot be modified toMMC or LMC.

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Full PartRotation

50 +/- 2o o

As Shownon Drawing

A

50 +/-0.25

0.75 A

Means This:

Datum axis A

0+-

The tolerance zone for the entire angled surface isequal to the total allowable movement of a dialindicator positioned normal to the true geometric

shape of the feature surface when the part isrotated about the datum axis and the indicator ismoved along the entire length of the featuresurface.0 +-

NOTE: Unlike circular runout, the use of total runout

will provide 3-dimensional composite control of thecumulative variations of circularity, coaxiality,angularity, taper and profile of the angled surface

Total Runout(Angled Surface to Datum Axis)

Collet or Chuck

When measuring total runout, theindicator must not be reset whenrepositioned along the featuresurface.

(applies to the entire feature surface)Allowable indicator reading = 0.75 max.

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0+-

Total Runout(Surface Perpendicular to Datum Axis)

As Shownon Drawing

A

50 +/-0.25

0.75 A

35

10

0+-

Datum axis AFull PartRotation

35

10

Means This:

NOTE: The use of total runout in this examplewill provide composite control of the cumulative

variations of perpendicularity (wobble) andflatness (concavity or convexity) of the featuresurface.

The tolerance zone for the portion of the feature surfaceindicated is equal to the total allowable movement of a dial

indicator positioned normal to the true geometric shape of thefeature surface when the part is rotated about the datum axisand the indicator is moved along the portion of the featuresurface within the area described by the basic dimensions.

When measuring total runout, the indicatormust not be reset when repositioned along thefeature surface.

(applies to portion of feature surface indicated)Allowable indicator reading = 0.75 max.

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Circular runout and total runout fall under the category of runouttolerances.

Circular runout is the total indicator movement of a dial gage that probesthe runout of features when rotated about the datum axis. It is expressedat individual sections.

Total runout involves total indicators reading measurement of runout whenthe dial is moved along the axis of the feature while probing.

Runout tolerance

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