On Thursday, January 05, 2012 08:01:43 AM Mark Wendt did opine: > On 01/05/2012 05:05 AM, andy pugh wrote: > > 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/incr > > emental_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. > > Love the "clamp" mod on your cutting head! <VBSEG> > > Mark
Chuckle. BTDT, but needed something just a hair more substantial for milling mortis and tennon joints with my micromill on steroids: <http://http://coyoteden.dyndns-free.com:85/gene/emc/17.html> The 4 bolts on the right are tapped into holes drilled in the front face of the Z sled casting, and once the HF die grinder was fitted, it looks like this: <http://http://coyoteden.dyndns-free.com:85/gene/emc/18.html> Which almost hides the mill from that angle, and also shows the white ash jig that holds the stick the tenon will be carved on. I used it that way, but it really needs another skyhook & screen door spring to hold up the additional weight, the off-center loading on the sleds ways tends to make the sled want to move in 2 thou increments unless I drown it with Vactra. Also faintly visible to the left is my custom made boring bar mounted on the 7x10 that carved the saddles in the clamp around the die grinder, after the ridges on the die grinder nose housing were laid back flat with a 14" mill bastard file. That boring bar is actually a groove cut in the end of a piece of 5/8" cold roll, with a Glanz brand 1/4" indexable boring bar driven into the groove with a 3 pounder, and superglued to be sure. Unforch, the saddle on that 7x10 is about tapped out, literally as I had to replace the compound slider when I stripped out the threads in the top of it while boring a previous project, the coupling housing & motor mount for my A/B/C axis rotary table. I was boring a nearly 2" diameter hole well over 3" deep. The 7x10 complained, a lot! The end result of that is at: <http://http://coyoteden.dyndns-free.com:85/gene/emc/4.html> I think they would call that shade tree engineering, but the mortis's & tenons it cut fit better than any I had cut by hand before. Don't like the fit? Tweak the code! Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Work continues in this area. -- DEC's SPR-Answering-Automaton ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
