Cylinder / Plane RunOut




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Command Activation

  Tolerances→RunOut→Cylinder / Plane  
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Not all GeoTol functions are accessed through the GeoTol wizard. Some special cases are separate functions such as the RunOut between and Plane and Cylinder. The Cylinder / Plane RunOut routine is designed to calculate the RunOut deviation of a Cylinder that is perpendicular to a plane at a given radial distance. This calculation would be similar to placing a test indicator on the end of a cylinder whose lateral position is fixed. The indicator would be placed in a fixed position identified as the radial distance. The part would be turned slowly and the Total Indicator Reading (TIR) would be recorded, see figure 1.

figure 1, RunOut with Indicator Setup

Setup for a RunOut

The first requirement to making this routine successful is to measure a cylinder and plane with sufficient data points. Under these conditions the cylinder and plane should be measured with at least 30 points, more if necessary to locate a representation of the variances within the surface.

When performing the RunOut test manually, as shown in the example above, you are actually capturing millions of data points while rotating the part. The indicator will show a displacement from the highest to the lowest reading. This spread will represent the RunOut.

A CMM, which builds features using discrete numbers of data points will often never locate the total spread. The features are created using a best-fit algorithm. The result will contain a small uncertainty between the reported feature and the actual work piece. Therefore the higher the number of data points used, the greater the chance you will return a RunOut that resembles the manual method.

Determining the RunOut Value

Once you have completed measuring the Cylinder and Plane, activate the RunOut routine, through the main drop down menus [Tolerances→RunOut→Cylinder/Plane]. The RunOut tool will appear.

Cylinder/Plane RunOut Tool Feature Selection Tool

Step 1 Select Cylinder

Press the <Choose Cyl> button and the Feature Selector will appear with a filter activated to show only Cylinders in your inspection report, see figure Feature Selection Tool. Highlight the cylinder required for the RunOut routine and press <Ok>.

Step 2 Select Plane

Press the <Choose Plane> button and the Feature Selector will appear with a filter activated to show only Planes. Highlight the plane required for the RunOut routine and press <Ok>.

Step 3 Set the Radial Test Length

In this step, enter the radial distance from the axis of the cylinder you would like the RunOut to be calculated at. This can be explained as the location you would set the test indicator at.

Step 4 Allowable Tolerance Zone

This RunOut tolerance value is the total allowable deviation of the actual TIR value. If the calculated deviation exceeds this amount, it is considered out-of-tolerance.


The Calculate button updates the Actual: data field and is an optional step before building the inspection step.

<Auto PE>

The <Auto PE> button is a push-on, Push-off button. When locked in the down state, as shown in example on the previous page, Geomet will automatically attach a Print Exception flag on the result when it attaches the inspection step, see Print Exceptions for additional information.


To record the results in the inspection report, press the <Ok> button. An entry will be made, see figure below.

RunOut Reported Results

Adjusting the Tolerance Limit

Adjust Tolerance

You can at any time adjust the maximum allowable tolerance limit. To start, highlight the feature in the inspection report area and right-click to activate the feature sub-menu. Choose Edit Tolerance from the list and the Tolerance Dialog will appear, see figure. After making any necessary changes, press the <Ok> button and the reported results will be updated.

Tolerance, Cylinder, Plane, Out-of-Tolerance Flash Message