I recently got some Avago AEDR8300K encoder sensors. These have two detectors in a small SMT package for quadrature in one device. http://www.avagotech.com/pages/en/motion_control_encoder_products/incremental_encoders/reflective_encoders/aedr-8300-1k0/My plan was to laser-print a target onto adhesive vinyl and use that as the target, but unfortunately it seems that these sensors require a very shiny target (specular reflectance > 60) with not-shiny parts. White paper is "not there" to these sensors. Polished aluminium is very much "there" but so is polished aluminium with black marks on. After some experimentation I found that polished aluminium with an etched pattern works very well, though. So I CNC-marked a polished encoder ring and etched it in FeCl. This looks like it is going to work very well indeed, and was a lot less trouble than milling (and more suited to the dimensions of the part)http://youtu.be/c1zCG-uPaoM
I will see how the pen-drawn version works out, but the idea ought to work fairly well (and at much finer pitch) with photo-resist methods. -- atp The idea that there is no such thing as objective truth is, quite simply, wrong. ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
