----- Original Message ----- From: "John Kasunich" <[EMAIL PROTECTED]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Saturday, July 28, 2007 11:50 AM Subject: Re: [Emc-users] More on Spindle Control
> If its acceptably stable running open loop, why not run it open loop? > No PID loop to tune. Hi John, thanks for the reply. My lathe has 2 knobs for spindle gear select and each knob has 3 positions. Center position of one knob is neutral so all together I have 6 spindle speeds. I would prefer not to mount switches on the knobs on the operator side of the headstock or inside the oil mess inside the headstock. I would be open to something like a thumbwheel or something on the screen or in the program (hal-manual-spindle-gear-select :-) The bottom line of what I want is to be able to change speeds with the S command and the drive not kick out when decelerating. I just thought since the spindle encoder feedback is already there, it would be nice just to have the spindle acelerate or decelerate at a set rate to the desired speed and then hold at that speed. Is there some difficulty with running the spindle closed loop that I'm not aware of? If I use spindle position =>ddt => lowpass X 60 for RPM, is using latch-index going to mess up my RPM readings with spindle position is reset? To sum it up, for open loop I need hal configuration and a way to select the gear ratio, for closed loop I just need hal configuration. Or at least that's what I'm thinking.... Thanks again! Roger Neal ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
