I think MPG's are too expensive, so I am trying to see if I could make one. What I have so far is at the top of the page here: http://www.wallacecompany.com/machine_shop/Shizuoka/
Thanks to jmk, swp and tom on IRC, I was able to come up with the pyVCP files to jury rig something that seems to work: http://www.wallacecompany.com/machine_shop/Shizuoka/emc2/configs/ST-N_current/ As a 100 pulse per revolution encoder, what I have so far works well. One problem is that in the .01" per pulse scale selected, the axis does what is is told to do, which is move .01" at maximum velocity. If you spin the mpg at moderate speeds, the .01" commands stack up, so you get smooth movement. At slow mpg rates each, you get a fast stop - start which can shake the whole machine. Has anyone else had this problem? As for cost the sensors where around $4.00 for the pair. Everything else was in my "stuff" collection. Of course, I have a way to go before having a formal mpg. It probably would be cheaper to just buy an mpg, but if I can get a decent design worked out, and I make enough for all of my machines, then it might be worth while. I am planning on having the mpg and two buttons mounted in a pendant. One button to toggle the three scale values, another to toggle through the enable for each axis and none. The settings will be displayed in AXIS (pyVCP). An e-stop would be nice too. This requires five pair of of wires so a CAT-5 cable wouldn't quite make it. The radial lines on the encoder disk are for detenting, that I won't be using. A second disk with 100 notches on the circumference will be added. A .250" OD ball bearing and sprung lever will be the detent. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your production scanning environment may not be a perfect world - but thanks to Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 Series Scanner you'll get full speed at 300 dpi even with all image processing features enabled. http://p.sf.net/sfu/kodak-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
