Detecting doube stacked parts

[jonesy29847]

I currently have an application where I am unloading 4 columns of part from a rack and loading them to a transfer system where they are indexed one at a time into a press. The parts are roll formed and there have been reports where two parts, from the same column, are picked up by the robot. I am investigating methods of detecting them and am considering the use of a pixel counter or a very lo cost vision system, such as a Cognex Checker. Fortunately the is aboub 1mm separation of the part so detecting should be pretty simple. Does anyone have experience with these sort os systems, I would like caveats and ay other helpful information that you may have.

 

[TWControls]

This guy uses the Cognex cameras all the time. I think he can set them up in his sleep

http://www.mrplc.com/kb/index.php?page=index_v2&id=20&c=37

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TW Controls -

http://www.twcontrols.com