On Nov 12, 2009, at 4:55 AM, John Thornton wrote: >> If I am using a servo with 512 PPR, is a step 1/512 of a revolution? > > If your servo drives take step and direction signals then they are > just like steppers to the > software. If it takes 512 steps to go one revolution and it takes > two revolutions to move one > inch then your scale is 1024 = the number of steps to move one inch > (or mm).
Thanks for confirming that John. >> I >> guess I do not know how step/microsteps apply to servos... > > It would not apply to servos only to drives that take step and > direction signals. Steps and > micro steps and gear ratios and pulleys all add up to one thing "how > many pulses does it > take to go one unit". > > If you have servo drives that take PWM or 0-10v signals and feed > back position info to EMC > via an encoder then that is a whole different beast. Got it. I thought I read somewhere that servos are treated like a step motor from EMC. My encoders send the signal back to the Gecko 320's. So I assume that the Gecko "knows" the position of the servo and EMC instructs it where to move. This is just speculation on my part, so I could be wrong. >> Is it possible with EMC to command the servo to move 1 revolution >> (or >> a specific number of steps) instead of specifying a distance? > > If you set your scale correctly I assume you could... dunno why you > would want to I was thinking it would allow me to set the scale. I could tell it to do 512 steps and measure, or 25,600 steps and measure the distance the belt moves.. Thanks again, Jeshua Lacock Founder/Programmer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
