On 03/14/2016 03:55 PM, Gene Heskett wrote: > On Monday 14 March 2016 18:08:48 andy pugh wrote: > >> On 14 March 2016 at 21:58, Gene Heskett <ghesk...@wdtv.com> wrote: >>>> Have you tried reversing without the relay? I don't have any >>>> braking relays and my spindles all stop adequately quickly. >>> >>> The only relay present on the control board is apparently the >>> external reverse signal. There is a page in the parameter menu that >>> can switch that around some. >> >> Can I re-phrase the question with the word I meant to type? >> >> Have you tried reversing without the _resistor_ > > That is what I was trying to describe Andy, and I can reverse it from 6k > rpms fwd to 6k rpms in reverse and back in 1 second total each way. No > hits, no runs, and NO errors. I'll try it in even less time tomorrow. > Once, from 100 rpms. it was so violent it uncrewed the collet nut! > > Cheers, Gene Heskett >
I didn't realize my dynamic braking wasn't working until I tried using CSS (constant surface speed, G96, http://linuxcnc.org/docs/2.7/html/gcode/g-code.html#gcode:g96-g97 ) with my lathe. If your lathe can do CSS, you might want to include this in your testing. My lathe was over-volting on a rapid move from 0 radius (CSS set to 2500 RPM max.) to a 1 inch radius (a few hundred RPM) during a facing routine. It seems that my VFD doesn't honor its deceleration ramp register settings because the CSS deceleration is a bunch of speed commands (, at the servo rate?, ) from LinuxCNC rather than a single command to a new RPM which G97 RPM mode would use. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
