### Available Measurement Strategy Properties

This topic describes the properties available in the dialog box that appears when you select a strategy on the Measurement Strategies tab. For more information on selecting a measurement strategy, see Working with Measurement Strategies.

Properties for Adaptive Scanning Measurement Strategies

When you select an Adaptive Scanning strategy, use the properties on the Adaptive Scanning Setup tab in the Probe Toolbox dialog box to supply all known information about the feature's tolerance requirements and the surface type, and PC-DMIS does the rest.

Sample Probe Toolbox – Adaptive Scanning Setup tab

Feature parameters such as diameter and center are specified through the upper portion of the Auto Feature dialog box. For more information about these parameters, see Inserting Auto Features.

Complete the properties that are available for the measurement strategy you selected. Many of these properties are common to one or more strategies. The Adaptive Scanning Setup tab can include the properties in the following table.

Properties | Description
Size check box | Select this check box if the purpose of the measurement is size tolerance.
Location check box | Select this check box if the purpose of the measurement is location tolerance.
Form check box | Select this check box if the purpose of the measurement is form tolerance.
Tolerance box | This value defines the permissible limit or the limit of variation in size, location, and form.
Surface Type list | Select Polished, Machined, Ground, or Cast.

Use the Advanced tab to override the calculated settings and any automatically configured parameters.

Sample Probe Toolbox – Advanced tab

Complete the properties that are available for the strategy you selected. Many of these properties are common to one or more strategies. The Advanced tab can include the properties in the following table.

Properties | Description
Override check box | This value overrides any automatically configured parameters. Marking this check box enables the Point Density box, Scan Speed box, Acceleration box, and Offset Force box, allowing you to change the scanning characteristics for this measurement.
Point Density box | This value defines the number of readings to take per unit of measurement during the scan.
Scan Speed box | This value defines the scan speed. Depending on the state of the Display absolute speeds check box in the Part/Machine tab of the Setup Options dialog box, this will either be an absolute speed (mm/sec) or a percentage of the machine's total speed capability.
Acceleration box | This value specifies the acceleration to use during a scan. The value is specified in mm/sec/sec.
Offset Force box | This value specifies what level of force to maintain during a scan. The value is specified in newtons.
Scan Type list | This value specifies the type of scan that you want to execute on the controller:

- Defined – Execute defined path scan on a B3C, B4, or FDC controller.

- CIR – Execute the CIR type of scan on a B4 controller.

Direction list | Select Clockwise or Counterclockwise.
Start box | This value specifies the start angle, in decimal degrees.
End Angle box | This value specifies the end angle, in decimal degrees.
Outlier list | For a best fit (BF) or best fit recompensate (BFRE) circle, you can choose to remove outliers based on the distance from the best fit feature. This allows the removal of anomalies that arise in the measurement process. PC-DMIS first fits a circle to the data, then determines which points are outliers based on the standard deviation multiple. It then does the following:

- Recalculates the best fit circle with those outliers removed

- Checks for outliers again

- Recalculates the best fit circle

- Continues repeating this process until no more outliers exist or until PC-DMIS cannot compute the circle (PC-DMIS cannot compute the circle if there are fewer than three data points)

Filter list | This value indicates the filter type for the scan. Some filtering options are specific to certain strategies.

- None – No filter type is applied to the scan data set.

- Gaussian – A Gaussian filter is applied to the scan data set, smoothing the data.

Wavelength box | Oscillations in data smaller than this value will be smoothed when applying the linear Gaussian filter. This applies to lines and planes. Important: The wavelength value must be entered in millimeters.
UPR box | Undulations per revolution. The default is 50. UPR applies only to cylinders and circles. This item will be hidden if you select None in the Filter list.
Pre-Probe Cylinder check box | Takes touch points to locate the cylinder prior to scanning.
Threaded Hole check box | When you select this check box, it turns on a filter on B3 controllers to increase accuracy when scanning threads.
Use Gage Scan Filter check box | This property corrects measured scan data by comparing it to similar scan data from a gage. For more information, see Gage Scan Filter.

The following properties are available on the Control Elements tab. This tab applies only to the Adaptive Circle Scan Strategy.

Sample Probe Toolbox – Control Element tab

Properties | Description
Control Element list | This property defines whether the circle scan will be done on a cylindrical or spherical shape.
Sphere Center boxes | This property appears when you choose Spherical in the Control Element list. For this property, the vectors of the derived scan are not in the plane of the circle, but are normal to the sphere surface. One use for this scan type is the ISO 10360-4 tests. The X, Y, and Z boxes are the part coordinates.

Properties for Cylinder Centering Thread Scan Strategy

The following properties are available for the Cylinder Centering Thread Scan Strategy:

Sample Probe Toolbox – Cylinder Centering Thread Scan Strategy

Properties | Description
Point Density box | This value defines the number of readings to take per unit of measurement during the scan.
Scan Speed box | This value defines the scan speed. Depending on the state of the Display absolute speeds check box in the Part/Machine tab of the Setup Options dialog box, this will either be an absolute speed (mm/sec) or a percentage of the machine's total speed capability.
Find Nadir check box | This value takes two hits at slightly different points on the thread to determine the best place to start the scan. It picks the point that is deepest into the thread.
Filtering area | The properties in the Filtering area filter data from the scan. Filter Type list:

- None – No filter type is applied to the scan data set.

- Gaussian – A Gaussian cylindrical filter is applied to the scan data set.

- Cylinder – A cylindrical filter is applied to the scan data set.

UPR box: Undulations per revolution. The default is 50. UPR only applies to cylinders and circles. This item will be hidden if you select None in the Filter Type list.