The problem is that I have two surplus Lenovo PCs that are more than adequate for LinuxCNC. One for a spare. But they have only two slots which are low profile to boot. If I want to go drop $100 (Cdn) I can get newer Lenovos that have 4 full height slots and faster processors. But they don't come with hard drives since they are government surplus.
But for this initial project the goal was to have a WIN-XP (might have to be WIN-7 since the built in network interface is too new for WIN-XP) and MACH3 and then write up a nice step by step guide on how to move from MACH3 to LinuxCNC while keeping the one or two parallel port cables that go to the sy stem BoB. I know lots of people running MACH3 that at the moment are quite happy. I know only one person running Linux. And one of the WIN-XP/MACH3 people detests Microsoft and Windows and only recently bought a WIN-10 laptop so he could access Fusion-360. But MACH3 with the wizards and graphical interface for setup is just so much easier. Even with an USB or Ethernet Smooth Stepper. But I'm determined to not quit (I've come close). John > If its not supported it may be chiefly a matter of adding the non-open > source > driver package > > Might be easier to find a supported WIFI adapter (I'm using some $8.00 > edimax > thing here thats trouble free and has built in support) > > > > > 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 > > > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > > _______________________________________________ > 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
