I don't think you will get 0.5mm resolution from those optical sensors. They would be good to get a rough idea but of you want that sort of resolution you will need something more accurate.
To stop the motors moving too far you could make your code hold position if the plate moves beyond a certain point. Taking this further you could maybe wait for the plate to suddenly move out then stop (at the width of the board) before moving the motor. This would save a lot of unnecessary motor movement. Are the boards parallel? If not you will have to track them as they move through the machine. Les On 13/05/2014 18:54, Viesturs Lācis wrote: > I am looking at something like 0,2-0,5 mm positioning accuracy. I like the > sensor idea, because that would keep the head from moving to start point > after each board, it would move just by the difference of board widths > instead. > Are there any other possible sensors that could do the trick? That > particular is out of stock, but it seemed that it had pretty good slope in > 100-350 mm range on the graph of outputs volts vs sensing distance. > > Viesturs > ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
