You can get a variable frequency pulse train out of a hostmot2 stepgen by switching it to velocity mode. Look at the control-type and velocity-cmd pins.
http://www.linuxcnc.org/docs/devel/html/man/man9/hostmot2.9.html -- Sebastian Kuzminsky never be discouraged just let your nerdy flourish -----Original Message----- From: "Rudy du Preez" <r...@asmsa.co.za> Subj: Re: [Emc-users] Hostmot2 spindle velocity control Date: Thu 2010 Mar 25 3:07 Size: 1K To: <emc-users@lists.sourceforge.net> I have now converted three machines to EMC2 using parallel port for the two small machines (a lathe and a mill) and 5i20+7i37 cards for the bigger milling machine. The next two (lathes) are a bit more complicated in that they have servo motors with encoders driving the spindles. Whereas the stepgen component has velocity-command output, the hostmot2.stepgen component seems to lack this kind of output (it seems to have position-command only). Is it possible to generate a variable frequency pulse stream through hostmot2 to control the speed of the servo spindle motor? The one servo drive needs pulse/direction inputs and has 1000 ppr encoder output. Encoder gearing can be set. The other drive needs a +-10V analogue signal for velocity control and also has similar encoder output. For the latter I have a 7i33 that could be used. I am sure there is a way, and it is probably written up somewhere, but I have not been able to find it. Rudy __________ Information from ESET Smart Security, version of virus signature database 4972 (20100324) __________ The message was checked by ESET Smart Security. http://www.eset.com ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
