On Fri, 2010-03-05 at 10:23 -0500, Dave wrote: > Like you guys, I'm interested in using some of these inexpensive > encoders. Compared to industrial units, they are a fraction of the price. > > The casing and wiring is obviously not "industrial" Nema 12 etc, in > nature - no oilproof military connector on the side of the encoder and > no bearings... > > So how do you guys get around these issues? Fashion some type of > cover over the back of the motors and run the cable through a grommet?
Maybe this? http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=APC1069-ND > How could you use one of these encoders for a spindle encoder? Make up > a two bearing support system with a stub shaft that the encoder can hang > off of? > > I haven't heard much about US Digital's cheap encoders. What about > Renco encoders? Is the consensus that those are ok? > > Dave I think the cheap way to use U. S. Digital encoders is to make your own from their hubs and sensors, which I did for my lathe: http://www.wallacecompany.com/cnc_lathe/HNC/00011-1a.jpg http://www.wallacecompany.com/cnc_lathe/HNC/00001-1a.jpg http://www.wallacecompany.com/cnc_lathe/HNC/00004-1a.jpg For the axes encoders I made round Delrin covers with an o-ring seal. Then used pressed in brass inserts through the cover for screw terminals. I should install shaft seals, but I haven't gotten round2it. My plan for the AEAT's may be similar. The sensor boards have two tiny plastic pins that are staked to fasten the board. A hot soldering iron tip could soften the staking, and the board pushed out. http://www.wallacecompany.com/machine_shop/EMC2/absolute_encoder/dcp_6877-1a.jpg A shaft, bearings and housing would need to be designed with magnetic fields in mind. Using a screw terminal block on an o-ring sealed circuit board might be a way to go. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=A98336-ND or add a few more terminals and place a differential driver chip on the inside of the board. An SSI hal component is in the works too, unless someone has one already? -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
