M
Hey gang,
I've had a customer ask me a question that I really don't know how to answer. We were asked to look at building a test instrument to detect part placement using a commercially available vision system. In theory it's a simple enough task; you fix the camera on the end of a robot arm so you can articulate it to different areas of the piece under inspection, go to the inspection points, line up on a few key features of the assembly, then look for the edges of the part to see if they fall within the "box" of acceptable position.
However, the question arose about how to perform a gage R&R on the inspection system. My first thoughts were, it's a nonsensical question because there aren't any "units" the system is measuring. What's it off by 4 pixels? What's the unit for a pixel? However, the question isn't a "trick" and it was asked in all seriousness. Honestly, the device would be a piece of gaging equipment determining quality of a finished good. How would a metrology lab "calibrate" it? I don't know.
How should I think about this? I didn't anticipate attempting to use the camera as an optical CMM device trying to measure quantitative data about how far out the part may be if it isn't in the correct position, but even if it's just a go/no-go gage what's the acceptance criteria?
Anyone have any thoughts on what concept I'm overlooking?
Michael
--
Michael R. Batchelor
www.ind-info.com
GUERRILLA MAINTENANCE [TM] PLC Training
5 Day Hands on PLC Boot Camp for Allen Bradley
PLC-5, SLC-500, and ControlLogix
If you aren't satisfied, don't pay for it. Guaranteed. Period.
[email protected]
Industrial Informatics, Inc.
1013 Bankton Cir., Suite C
Charleston, SC 29406
843-329-0342 x111 Voice
843-412-2692 Cell
843-329-0343 FAX
I've had a customer ask me a question that I really don't know how to answer. We were asked to look at building a test instrument to detect part placement using a commercially available vision system. In theory it's a simple enough task; you fix the camera on the end of a robot arm so you can articulate it to different areas of the piece under inspection, go to the inspection points, line up on a few key features of the assembly, then look for the edges of the part to see if they fall within the "box" of acceptable position.
However, the question arose about how to perform a gage R&R on the inspection system. My first thoughts were, it's a nonsensical question because there aren't any "units" the system is measuring. What's it off by 4 pixels? What's the unit for a pixel? However, the question isn't a "trick" and it was asked in all seriousness. Honestly, the device would be a piece of gaging equipment determining quality of a finished good. How would a metrology lab "calibrate" it? I don't know.
How should I think about this? I didn't anticipate attempting to use the camera as an optical CMM device trying to measure quantitative data about how far out the part may be if it isn't in the correct position, but even if it's just a go/no-go gage what's the acceptance criteria?
Anyone have any thoughts on what concept I'm overlooking?
Michael
--
Michael R. Batchelor
www.ind-info.com
GUERRILLA MAINTENANCE [TM] PLC Training
5 Day Hands on PLC Boot Camp for Allen Bradley
PLC-5, SLC-500, and ControlLogix
If you aren't satisfied, don't pay for it. Guaranteed. Period.
[email protected]
Industrial Informatics, Inc.
1013 Bankton Cir., Suite C
Charleston, SC 29406
843-329-0342 x111 Voice
843-412-2692 Cell
843-329-0343 FAX