As I understand it, the lower matrix is the fundamental matrix that establishes the location and orientation of the mount point. The individual probe angle offsets are related to this matrix, which is in turn related to the machine home position.
You should only need to do it if the machine has been crashed or significantly altered in some way. Definitely not something that needs to be done every time you calibrate. I believe the tech will do it at each annual machine calibration and, if nothing is wrong, you shouldn't need to do it again.
It is part of the whole calibration system so if something is not working in the calibration process it doesn't hurt to run it again. It will instruct you to use the most rigid stylus that you have. We use the 100mm puck, which is the shortest our probe can use, with a 5mm x 21mm ruby stylus. You can see the current values for the lower matrix in the settings editor. I always go in there and copy them out to a text file so I can compare the new numbers.
I do the procedure like this:
1) Calibrate A0B0 on the master stylus that I am going to use. Answer "Yes" to has the sphere moved.
2) run the lower matrix (all you have to do is check the box for it in the measure dialoge and click measure). If you have multiple angles defined for the stylus you must only have your A0B0 angle selected or it will give you an error. Answer "No" to has the sphere moved.
3) Follow the prompts
4) When it displays the new data check it against the old numbers to verify that nothing is crazy different. The numbers will be different but shouldn't be wildly different.
5) Requalify my master tip answering "Yes" to has the sphere moved.
6) Qualify my other tips as usual answering "No" to has the sphere moved.
As I understand it, the lower matrix is the fundamental matrix that establishes the location and orientation of the mount point. The individual probe angle offsets are related to this matrix, which is in turn related to the machine home position.
You should only need to do it if the machine has been crashed or significantly altered in some way. Definitely not something that needs to be done every time you calibrate. I believe the tech will do it at each annual machine calibration and, if nothing is wrong, you shouldn't need to do it again.
It is part of the whole calibration system so if something is not working in the calibration process it doesn't hurt to run it again. It will instruct you to use the most rigid stylus that you have. We use the 100mm puck, which is the shortest our probe can use, with a 5mm x 21mm ruby stylus. You can see the current values for the lower matrix in the settings editor. I always go in there and copy them out to a text file so I can compare the new numbers.
I do the procedure like this:
1) Calibrate A0B0 on the master stylus that I am going to use. Answer "Yes" to has the sphere moved.
2) run the lower matrix (all you have to do is check the box for it in the measure dialoge and click measure). If you have multiple angles defined for the stylus you must only have your A0B0 angle selected or it will give you an error. Answer "No" to has the sphere moved.
3) Follow the prompts
4) When it displays the new data check it against the old numbers to verify that nothing is crazy different. The numbers will be different but shouldn't be wildly different.
5) Requalify my master tip answering "Yes" to has the sphere moved.
6) Qualify my other tips as usual answering "No" to has the sphere moved.
