Peter, Ah! That now makes sense. Thanks. Now to figure out how to install a driver for the ASUS USB AC-56 WiFi connection. Everything out there refers to Ubuntu and recompiling stuff. But some of it is also very old. No plug and play with it like in WIN-7 and up.
Or find a low profile PCI Ethernet card John > -----Original Message----- > From: Peter C. Wallace [mailto:p...@mesanet.com] > Sent: August-21-19 8:21 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] MESA 7i92H Saga > > On Wed, 21 Aug 2019, John Dammeyer wrote: > > > Date: Wed, 21 Aug 2019 19:01:35 -0700 > > From: John Dammeyer <jo...@autoartisans.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 7i92H Saga > > > >>>>>> originally created by pncconfig. Should not > > >>> setp hm2_7i92.0.stepgen.00.control-type 1 > > >>> be control-type 0? > > >>> > > >> > > >> No, needs to be 1 > > > > > > So what does it need to be for the spindle then? > > > > Also 1 since you are setting the steprate from the spindle speed > > > > > > > > The tutorial suggests stepgen is type 0 for step/dir and "ctrl_type" type > > > v > > > for velocity. > > > > > > I haven't found the details on "control-type" in a document yet. > > > > > > > > > hm2_7i92.0.stepgen.05.control-type > > > Perhaps I overlooked it somewhere? > > > > man hostmot2, stepgen section > > > Yes but... to quote > http://linuxcnc.org/docs/html/man/man9/hostmot2.9.html#stepgen > > "(bit input) controltype > Switches between position control mode (0) and velocity > control mode (1). Defaults to position control (0)." > > > >Why then do the XYZA axis have control_type set to 1 when the above > snippet > >clearly says position control mode is 0? > > The stepgens are used in velocity mode (1) the position is controlled via the > PID component > > You can run the stepgens in position mode but this has two disadvantages > > 1. The built in position mode controller is not as robust as the PID loop with > regard to host jitter > 2. When the stepgens are used in velocity mode the hal boilerplate for > encoder feedback is already there (just a net change of the position > feedback) > > > > > > >Is this then an error in the manual or just poorly explained? Does LinuxCNC, > >when used to run a milling machine, use velocity control to move the motor > and > >somehow also track the position? > > The hostmot2 manual applies only to the low level hardware and driver, the > hal > configuration that pncconf creates does the position control with hal and the > PID component and hence uses the stepgen in velocity mode. > > LinuxCNCs motion component hands position waypoints (and also velocities > and > accelerations) to the hal layer at the servo thread rate. How these are > converted to signals that feed the motor drives is up to the machine specific > hal configuration. > > > > >When I wrote my Electronic Lead Screw software that had to track the > spindle > >speed the velocity of the Z axis carriage motor was critical and the position > >was really only used to decide when to finish accelerating and when to > >decelerate. Since the CNC G-Code specifies feed rate and in the case of > >multiple axis the feed rate along the path I can see that this might well be > >the way it's done. But with the manual stating 0 (position mode) is the > default and > >that G-Code tends to change positions but often leave the feed rate > constant > >it's a bit confusing. > > > >John _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
