Current Help System: PC-DMIS CMM (View Core Help)

### Available Measurement Strategy Properties

This topic describes additional properties available in the dialog box that appears when you click the Properties button for a strategy. Many of these properties are common to one or more strategies. These are listed in the second column.

Properties | Strategies Using this Property | Description
Point Density |

- Circle Analog

- Plane Circle

- Cylinder Concentric Circle

- Cylinder Spiral

- Cylinder Axis

This defines number of readings to take per unit of measurement during the scan.

PC-DMIS uses the same unit of measurement used in your part program.

Scan Speed |

- Circle Analog

- Plane Circle

- Cylinder Concentric Circle

- Cylinder Spiral

- Cylinder Axis

This 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.

Number of Lines |

- Cylinder Axis

This defines the number of lines to scan.

Number of Levels |

- Cylinder Concentric Circle

This defines the number of circles to scan.

Defined Path |

- Circle Analog

- Cylinder Concentric Circle

If you select this check box, PC-DMIS sends a distinct set of points defining the feature measurement path to the controller. If you don't select this check box, PC-DMIS will send the feature specific parameters to the controller.

If Pitch in the Contact Path Properties tab is not zero then PC-DMIS will use Defined Path automatically. It will mark the check box and will remain grayed out until Pitch is set to zero.

Override Global Scan Speed |

- Circle Analog

- Plane Circle

- Cylinder Concentric Circle

- Cylinder Spiral

- Cylinder Axis

Marking this check box enables the Scan Speed box, allowing you to change the global scan speed for this measurement.

Ensure that the PC-DMIS Settings Editor has VHSS enabled.

Filtering |

- Circle Analog

- Plane Circle

- Cylinder Concentric Circle

- Cylinder Spiral

- Cylinder Axis

The Filtering area filters data from the scan. Some filtering options are specific to certain strategies.

Outlier Elimination:

- None – No outliers are removed.

- 3 Sigma - Outliers beyond three standard deviations are removed.

Filter Type:

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

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

- Cylinder – This filter is applied to the scan data set. It creates a cylinder from the spiral scan and adjusting the data. It best fits a cylinder and then smoothes each point similar to the Gaussian filter. This is only available in the Cylinder Spiral Scan Strategy.

UPR: Undulations / Revolutions. Polar filter with typical values of 15, 50, 150 and 500. The default is 50. UPR only applies to cylinders and circles.

This will be hidden if you select None for Filter Type.

Cutoff Wavelength: This value determines the wavelength of the oscillations in the data below which the amplitudes of the oscillations will be reduced when applying a linear Gaussian filter. This applies to lines and planes.

This also applies to the threaded and Cylinder Axis scans because they use lines to construct the cylinder.

Important: The Cutoff Wavelength value must be entered in millimeters.

This will be hidden if you select None for Filter Type.

Outlier Tolerance: This box defines the tolerance value used to eliminate outliers.

Pre-Probe Cylinder |

- Cylinder Threaded Axis

This check box causes the probe to measure a standard Auto Circle on the cylinder before the actual cylinder measurement to check if the location of the center is off. This only matters if the threaded hole is millimeters off and will adjust for that.

Crop Overlapping Points |

- Circle Analog

- Cylinder Concentric Circle

If you scan over 360 degrees and this check box is marked, the software will crop all the points to 360 degrees.

This is useful when your speed is too fast for the CMM to catch up and it drifts past the stopping point and take extra points. This crops all the scanned data to 360 degrees. If the scanned circle is less than 360 degrees then no cropping occurs.

This is marked by default.