Since the next machine I build will be a servo powered gantry this is a very interesting discussion for me. I'm curious, Jon, if you were able to discern how Thermwood managed the homing problem. If you haven't, perhaps you could find some Thermwood owners here who may be able to shed some light: http://www.woodweb.com/cgi-bin/forums/cnc.pl +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ "Anyone who believes exponential growth can go on forever in a finite world is either a madman or an economist." -Kenneth Boulding, economist “How unfortunate that the Earth’s first intelligent social animal is a tribal carnivore” -E.O. Wilson, sociobiologist
>________________________________ > From: Jon Elson <el...@pico-systems.com> >To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> >Sent: Thursday, May 23, 2013 12:08 AM >Subject: Re: [Emc-users] gantry revisited > > >Gregg Eshelman wrote: >> --- On Wed, 5/22/13, Jon Elson <el...@pico-systems.com> wrote: >> >> >>> So, the issue of homing a dual-motor >>> gantry comes up, again. >>> >>> This one is a stiff structure, and the customer says if the >>> motors get >>> seriously out of synch, it will bend the slide rails. >>> >> >> The simplest way to do it is a cross drive shaft linking both sides and >> slave two axes together. >This is a 5 x 10 foot Thermwood router, so the motors are TEN FEET apart. >All the mechanicals are complete, this is only a controller retrofit. >The motors are pretty small (650 Oz-In continuous servos) so it really >needs both >motors. It worked for years with the Thermwood controller. I think the >motors are on little gearboxes with rack and pinion drive, and the shaft >may well be impossible to set up without completely redesigning the machine. > >Jon > >------------------------------------------------------------------------------ >Try New Relic Now & We'll Send You this Cool Shirt >New Relic is the only SaaS-based application performance monitoring service >that delivers powerful full stack analytics. Optimize and monitor your >browser, app, & servers with just a few lines of code. Try New Relic >and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
