Le 2014-05-03 04:50, Jon Elson a écrit : > There is a pic from the "HD5000" webcam in the Wiki at > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Adding_Digital_Zoom_To_Camview-Emc > that is not very impressive, you might be able to get it within .1mm > but that's about it.
I would like to clarify an important fact: the picture from the wiki is taken with a workpiece / camera distance of 100mm. At this distance, I achieved better than 0.05 mm accuracy, but with uncomfortable conditions. I agree, 0.1mm is the practical performance figure at this distance with this setup. Better resolution can be reach when going down to 25 mm distance as demonstrated here http://blog.f1oat.org/2014/05/03/hd5000-edge-finder-test-at-25-mm-distance/ However, I confirm HD5000 is limited because it does not have a microscope lens system. I use digital zoom with all well know drawbacks. My experience is that the main problem with this kind of camera setup (camera mounted on X/Y axis, not on Z) is the vertical alignment for proper operation with any height of the workpiece. That may be the major limitation to the overall accuracy of the system. See all my HD5000 topics here http://blog.f1oat.org/tag/hd5000/ Frederic. ------------------------------------------------------------------------------ "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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
