Gripe no 000

Summary

Description

You will need to create at least TWO points files.  One file will contain the surface inspection points.  The other file(s) will contain the points used for positioning.

1.  Decide how to create an alignment

For example:  the five positions below have been selected for a free form fit

2.  Record the size of the probe being used for the measurements.

For example, a 2mm ball probe has been used for this example

3.  Probe these points on the part with the CMM and save them to a file.   This file is the 'positioning' file.  Take a note of the approximate i,j,k or surface normal vectors for each point. 

For example:  these points were taken on the CMM and saved to file. 

POINT 251.715,175.327,-248.279
POINT 365.246,188.045,-261.851
POINT 399.733,225.691,-257.726
POINT 393.143,240.207,-248.365
POINT 273.757,278.793,-248.28

Point 1 was:  Z+ in CMM coordinates
Point 2 was:  X+ in CMM coordinates
Point 3 was:  Y- in CMM coordinates
Point 4 was:  Z+ in CMM coordinates
Point 5 was:  Z+ in CMM coordinates

4.  Probe the points required for the surface inspection and save them to another file.  This is the 'inspection' file.  Take a note of the approximate i,j,k or surface normal vector for the first point.

For example:  this is the start of a point file.

Point 1 was:  Z+ in CMM coordinates

5.  Modify the 'positioning' file so that it takes the following format.

0 X Y Z I J K probedia
1 X Y Z I J K
2 X Y Z I J K
3 X Y Z I J K

For example:  the point file from step 3 has been modified as follows.

6.  Save this modified 'positioning' point file with a .log extension

7.  Modify the 'inspection' file so that it takes the following format

X Y Z I J K probedia
X Y Z
X Y Z

For example:  the point file from step 4 has been modified as follows:

8.  Save this modified 'inspection' file with a .asc extension.

9.  Open a PowerINSPECT session with the relevant CAD file.

10.  Create a new PowerINSPECT 'probe change' to match the actual probe.   Select it.  DO NOT CALIBRATE THIS PROBE IN PowerINSPECT.

11.  Create in PowerINSPECT the features used for alignment.  This should correspond to the data measured in step 3.

In this example we create a 'Free Form Fit' alignment accordng to the positions decided in step 1.

12.  'Measure' these features in PowerINSPECT using the log file.

Access the log file with Measures- Simulation, or by 'right clicking' on the connection flash and choosing Simulation

Choose the 'positioning' log file created in step 6.

Start measuring, and senc each point to PowerINSPECT by selecting the line and pressing 'Send'.

Complete the alignment as usual.

13.  Create an 'Inspection Group' for 'Points on the Fly.'  Use 'Import Points from File.'

and select the 'inspection' file created in step 8.

This will add confetti to the screen in the normal way.

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14.  You may need to experiment with Measures- Parameters- 'Probe Point Options' to set appropriate Proximity Criteria.  If you have to increase the Proximity Criteria you will have to take the points again.

15.  Create a Best Fit in the normal way.