Motion Map Testing

The motion map test is designed to look for warnings or potential errors in the motion path saved with the inspection report. This feature can be set active to test the motion map before every run, or disable to be used only on demand. By default, Geomet activates the Motion Map Test.

figure 1, Enable Motion Map Test

To set the Motion Map Test to scan all part inspection programs automatically at the start of inspection runs, choose from the main drop down menus [System→Tests→Use Motion Map Test on Run].

When it is active, a check mark is shown next to the command in the drop down menu, see figure 1. When the test is disabled, or not checked, the test will not run at the start of a part program run.

 

To manually test the motion map, select from the drop down menu [System→Test→Test Motion Map]. Geomet will scan all features that contain motion entries and look for errors.

The Motion Map Test will look for the following conditions:

Missing IP or SO in first position

It is important that there is a reference point which precedes the Measurement Point (MP). The IP or SO before the MP will define the direction of approach and distance to MP that it should transition into the Probe Speed setting. When the preceding IP/SO is missing, Geomet will default into the Measurement Point Mode, and move towards the targeted MP at the slower probe speed.

Distance between Stand Off and Measuring Point

Under normal conditions, the distance between the SO-MP and MP-SO is controlled by the Standoff Distance value defined under DCC Settings. When teaching the motion path, it is customary to capture an Interim Point (IP) before you capture the Measurement Point. When this is done, Geomet will build an approach vector starting at the IP and ending at the MP. A Standoff Point is calculated along that approach vector using the length defined in DCC Settings or the distance between the IP and MP which ever is less.

Should the distance between the SO-MP-SO point sequence be to small, the touch probe may act erratic by not coming off the part after the measurement point. The appearance of this condition is that the CMM will capture the Measurement Point, then stop and not proceed further. The controller will stop at the SO position and see that the probe has not reset. All motion stops as a safety. The motion map test looks for a minimum of 0.005" (0.127mm).

Motion Attribute Records

The last test performed by the Motion Map Test will look for proper speeds and distances within each attribute record inserted into the motion map. An attribute record contains new values for Traverse Speed, Probing Speed, StandOff and Over Travel Distances.   These minimum values are:
 

When the Motion Map test is performed on demand, a text document appears reporting the results of the test, see figure 2. The window that appears can be resized using the standard Windows drag method. Should any condition be found that requires operator review, the feature number and brief description is provided. The operator should use the Motion Edit Tool to locate and correct any discrepancies.

figure 2, Motion Map Test Results with Errors

figure 3, Motion Map Test Results no Errors

When the Geomet system has been enabled to perform the test at every run, the report will only show when a discrepancy has been detected.