Tom Easterday wrote: > Thanks Jeff and Stephen. We were thinking of using it for home. So, if the > index pulse is going to be different each time, then how do physical limit > switches work any better? It is a digital input, no? > Right - it will work just as well as a switch, but probably with better precision (assuming that the switch you use for the first home contact has a trip range that's significantly smaller than the distance moved with one revolution of the screw).
You can choose the second home velocity based on the speed you can see the index and the accuracy you want. For example, assuming that you want to home to within 0-3 counts of the index, you can move at 4 counts per servo cycle (ie, 4000 counts/second) for the index-finding move. That will guarantee that the servo cycle is never more than 3 counts away from the actual edge. You still need to use an edge component to stretch the pulse, as Jeff suggested. - Steve ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
