The ratio is 40:1. If I make the pulses per rev very high the system becomes stable but the calibration is out off course. This supports your idea I think if I understand you correctly.
------ Original Message ------ From: "andy pugh" <bodge...@gmail.com> To: "Marius Liebenberg" <mar...@mastercut.co.za>; "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: 2016-10-25 14:01:06 Subject: Re: [Emc-users] Problem with servo setup >On 25 October 2016 at 07:16, Marius Liebenberg <mar...@mastercut.co.za> >wrote: > >> The 4th axis used to be a stepper and that worked well but we changed >>the >> stepper for a servo to get more speed through a reduction planetary >>gearbox. >> I attached the HAl and INI files. > >What is the ratio of the gearbox? > >I think I would expect much smaller gains for a rotary than for a >linear with the same servo. >Simplistically, one full revolution out-of-position for the linear >axis might be 2mm, but one full motor-rev out-of-position for the >rotary is 36 degrees with a 10:1 gearbox. > >That is about a 20x difference, and I would anticipate a 20:1 ratio in >PID gains to match. > >-- >atp >"A motorcycle is a bicycle with a pandemonium attachment and is >designed for the especial use of mechanical geniuses, daredevils and >lunatics." >— George Fitch, Atlanta Constitution Newspaper, 1916 ------------------------------------------------------------------------------ The Command Line: Reinvented for Modern Developers Did the resurgence of CLI tooling catch you by surprise? Reconnect with the command line and become more productive. Learn the new .NET and ASP.NET CLI. Get your free copy! http://sdm.link/telerik _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
