On Wed, 2009-04-01 at 18:43 -0700, Dave Engvall wrote: > <snip is all and start over> > > Am back from the beach and have tried things again. > > Finally found a fundamental mistake. 1525BR amps expect a > differential input; so battery boxes give the expected result. > However, the dacs are ground referenced. After I finally caught on I > wired the 1525 inputs with gnd to gnd and + dac to -amp input. > Now things move. > > The only problem is that both axes move in the wrong direction. So: > how do I cleanly reverse the movement without having to > fool with the encoders? > > BTW-the X axis that has absolutely awful response like 200 ms to max > velocity tuned to about 0.001 at 60 ips and 0.00004" at 10 ipm. > We'll see what we can get out of the Y axis. ;-) > > So the m5i20 does really run right out of the box. The same cannot > be said of my aging brain. > > Dave
I'm glad your making progress. It has been a while since I have had to think about this, but I believe you can change the direction of an axis by changing the .ini file OUTPUT_SCALE = 1 for the axis, to OUTPUT_SCALE = -1. If you have encoders, the .hal encoder settings may need to be adjusted too. Also I would have connected your amp inputs DAC signal ground to - input and DAC signal to + input, but I haven't studied your particular setup. --------------- Kirk http://www.wallacecompany.com/machine_shop/ ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
