On Sat, Sep 26, 2009 at 08:36:13AM +0100, Andy I wrote: > Hi Everyone, > Is this mail getting through??
Yes. > > I have an X2 mill with a spindle controller which converts pulses to > voltage output. I'm planning to use pwmgen in PDM mode to generate the > pulses. Is there a way to ramp up the pulse density (frequency) to > allow a soft spindle start? One way is to use a 'limit2' block between motion.spindle-speed-cmd and whatever is making the pulses. limit2.#.maxv limits the rate at which the output signal changes to track the input. For example, if you set it to 60, and the input is revolutions per second, then it will take 1 second to ramp up from 0RPM to 60RPM or down from 60RPM to 0RPM. At the same time, you'll probably want to start using the spindle-at-speed input so that emc waits for the spindle to reach the commanded speed before cutting. This involves a 'near2' block with its output going to motion.spindle-at-speed, one input coming from the motion.spindle-speed-cmd, and the other coming from the current spindle speed. If you have spindle feedback, then you'd use that. Otherwise, you'd use the limit2 output as a proxy for current spindle speed (since it's changing slow enough that the spindle can track it accurately) Jeff ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
