This might be a silly question but if you only want to move it one step then does the step line stay high? When does it go low? After all the next step might be in 30 minutes so should it go low in 15 minutes? That's quite the lookahead. Enquiring minds wish to know. ;-) John
> -----Original Message----- > From: Peter Wallace [mailto:p...@mesanet.com] > Sent: October 25, 2023 8:35 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Mesa Step Pulses? > > On Wed, 25 Oct 2023, Todd Zuercher wrote: > > > Date: Wed, 25 Oct 2023 15:15:36 +0000 > > From: Todd Zuercher <to...@pgrahamdunn.com> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> > > To: "Enhanced Machine Controller (EMC)" <emc- > us...@lists.sourceforge.net> > > Subject: Re: [Emc-users] Mesa Step Pulses? > > > > Peter, > > > > Thanks, But is it even going to be worth the effort? Since I'm sure the > > regular minimum pulse length signal is still going to at least work albeit > > with some possible theoretical performance limitations. I may not even > > require step rates beyond where this is a non-issue? > > Well since you can certainly get near square waves at the maximum speed > with the current setup, it doesnt seem that much is gained by always having > square wave step signals, since the minimum timings are always met. > > That said, there is an advantage of square wave outputs in simplifying > setup (since the step length and step space settings are unnecessary) > > > > > I've asked the drive manufacturer. See if they get back to me. > > > > Todd Zuercher > > P. Graham Dunn Inc. > > 630 Henry Street > > Dalton, Ohio 44618 > > Phone: (330)828-2105ext. 2031 > > > > -----Original Message----- > > From: Peter Wallace <p...@mesanet.com> > > Sent: Wednesday, October 25, 2023 10:36 AM > > To: Enhanced Machine Controller (EMC) <emc- > us...@lists.sourceforge.net> > > Subject: Re: [Emc-users] Mesa Step Pulses? > > > > [EXTERNAL EMAIL] Be sure links are safe. > > > > On Wed, 25 Oct 2023, Todd Zuercher wrote: > > > >> Date: Wed, 25 Oct 2023 12:22:40 +0000 > >> From: Todd Zuercher <to...@pgrahamdunn.com> > >> Reply-To: "Enhanced Machine Controller (EMC)" > >> <emc-users@lists.sourceforge.net> > >> To: "Enhanced Machine Controller (EMC)" > >> <emc-users@lists.sourceforge.net> > >> Subject: [Emc-users] Mesa Step Pulses? > >> > >> Hello, > >> > >> It is my understanding that the step pulses generated by Mesa cards > >> are always the minimum pulse length set by for example > >> hm2_5i25.0.stepgen.00.steplen, only the space between the pulses is > >> varied by the step rate, is that correct? > >> > >> I was reading the manual for the new drive I was planning to use in my > >> next build and see that the drive calls a preference of a 50% duty > >> cycle for step pulse inputs. I am guessing that it may have something > >> to do with how the drive's pulse filtering system works, such that for > >> maximum noise filtering and step reliability having the pulse length > >> be approximately equal to the step spacing gives the best results. > >> > >> So my questions are; Would it be possible to make a Mesa card output > >> a 50% duty cycle step pattern instead of the current default pattern? > >> And would doing this even be worth the effort? > > > > Its possible with a minor firmware change and LinuxCNC driver change to > enable the mode. > > > >> > >> Todd Zuercher > >> P. Graham Dunn > >> > Inc.<https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2F > >> > http://www.pgrahamdunn.com/%2Findex.php&data=05%7C01%7Ctoddz%4 > 0pgrahamdunn.com > >> > %7Ce5da628e16d4477d2d4008dbd567e82f%7C5758544c573f47cebee96c3e08 > 06fb43 > >> > %7C0%7C0%7C638338414483169698%7CUnknown%7CTWFpbGZsb3d8eyJWIj > oiMC4wLjAw > >> > MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C% > 7C&sda > >> > ta=Zwbdv69ESSXKwXR%2FvXYbyijq1wOtyar%2FYeCMJAr6fgg%3D&reserved > =0> > >> 630 Henry Street > >> Dalton, Ohio 44618 > >> Phone: (330)828-2105ext. 2031 > >> > >> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://list/ > >> s.sourceforge.net%2Flists%2Flistinfo%2Femc- > users&data=05%7C01%7Ctoddz% > >> > 40pgrahamdunn.com%7Ce5da628e16d4477d2d4008dbd567e82f%7C5758544c > 573f47c > >> > ebee96c3e0806fb43%7C0%7C0%7C638338414483169698%7CUnknown%7CT > WFpbGZsb3d > >> > 8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% > 3D%7C > >> > 3000%7C%7C%7C&sdata=f1ssQLGo0gn0%2B2tjHAUXLZOjfsSHNrJWTjJDkkDR > uAA%3D&r > >> eserved=0 > >> > > > > Peter Wallace > > Mesa Electronics > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Peter Wallace > Mesa Electronics > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
