Just contemplating retrofits of old Fanuc machines, but also these small routers I was just trouble shooting last week. Sure I know these could just be ran with the amps in current mode, but... I just wondered what if there were an easy way to get velocity control for cheap. It may not be worth the effort, and these routers I'm working with now seem to do fine with current command inputs as their original configuration. What I don't know is how much of a limitation Linuxcnc's servo thread sampling rate might be, or how fast the existing control samples the encoder positions. The encoder resolutions are not terribly high on these (nor were they 30+ years ago on the Fanucs)
Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: Jon Elson <el...@pico-systems.com> Sent: Monday, December 07, 2020 12:23 PM To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] Mesa Tacho Generator? On 12/07/2020 08:47 AM, Todd Zuercher wrote: > Is it possible to set up a firmware for a Mesa FPGA that could read the > encoder velocity from an encoder input and output that velocity as an analog > command directly to an analog output (hopefully at faster than the servo > thread rate) in order to bypass having to do that connection in Hal? Can the > analog outputs of any of Mesa's daughter cards be updated faster than the > Servo-thread rate? > > You can also get dedicated quadrature to tach converters (although they are kind of expensive) that could have as much bandwidth as you want. I've been thinking about making this one of my products for quite some time. TOO BAD they discontinued the L290 chip, which did it all. Jon _______________________________________________ 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
