On Apr 9, 2012, at 4:41 PM, Andy Pugh wrote: > On 9 Apr 2012, at 13:09, Jeshua Lacock <jes...@3dtopo.com> wrote: > >> All I know is I only have enough pulse bandwidth to run my servos quite >> slow. I thought this was based on how fast my computer can send pulses to >> the Geckos. > > If the drive is set to 10000 pulses per inch and you are using software step > generation then a typical base-thread rate of 30,000nS should let you move at > 3 inches per second. Using hardware pulse generation you should be able to > increase this, as long as the drive system can cope.
Yes, the drive system should cope with much faster. Of course, I will need to test it to see what speed makes it fault. > I suspect the confusion comes from the subject line referring to counting > rather than pulse generation. Honestly, I really do not understand exactly how the system even works. I just knew that the axis that is geared down the most takes the most bandwidth to run (the 'Pulse rate at max speed' figure reported on the Stepconf Wizard). So I had assumed that it was based on the encoder resolution. Since the encoders are connected to the Gecko - I honestly don't know what the limitation is other than I assume that it is an issue with how fast the system can issue pulses to the Gecko. In other words, if issuing pulses to the Gecko was not a bottleneck, how fast can the Geckos count the encoder lines - as fast as needed? > The Mesa 5i25 looks like a parallel port card and (in the G540 configuration) > you wire it like a parallel port card. It isn't a huge problem to make a > custom DB25 cable to adapt the pinouts if required. > > (In other configurations it can be nothing like a parallel port, and you can > hook 384 lines of IO to it, or directly connect 16 30A servo drives) Sounds good. I guess I am still confused. For a open-loop servos with LinuxCNC closing the loop setup, I guess I would connect the encoders straight to the pins of the 5i22? Would they still need to be split the encoder signals and go to both the 5i22 pins and the Geckos? Peter/Mesa if you are reading this: I really want to order a card from you - last week. ;) Can you please provide me a very quick and crude wiring diagram? My email I sent to sales on Friday has gone unanswered and I am really interested in being your customer. Please give me a hand if you can. Best, Jeshua Lacock Founder/Engineer 3DTOPO Incorporated <http://3DTOPO.com> Phone: 208.462.4171 ------------------------------------------------------------------------------ Better than sec? Nothing is better than sec when it comes to monitoring Big Data applications. Try Boundary one-second resolution app monitoring today. Free. http://p.sf.net/sfu/Boundary-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
