On 09/28/2011 01:56 PM, andy pugh wrote: > On 28 September 2011 21:14, Karl Cunningham<ka...@keckec.com> wrote: >> I'm writing a user-space program to manage spindle speed on a machine >> with a VFD for the motor, and drive ratios set by belt and gear changes. > > This doesn't answer your question, but are you aware that there are > realtime modules available to do the same thing? > (except they don't initiate the gear change, like you seem to be suggesting)
I want it to prompt the operator at the right moment to change belt/gear in response to a Snnn command, but just limit motor speed and not bother him if he's only adjusting the override. >> From available HAL signals I would like to determine whether a spindle >> speed change is due to the speed override slider in axis, or due to a >> gcode Snnn speed change. I don't want to initiate a belt or gear change >> if it is from override. > > I take it checking that testing if the over-ride value is other than > 100% isn't the answer? I want to ignore override changes, so far as gear changes are concerned. I'll have to limit motor speed to reasonable values, but that's no problem. >> The only way I've come up with is to monitor the ratio of >> motion.spindle-speed-out to halui.spindle-override.value. The ratio >> doesn't seem to change when the override is changed, but does with >> programmed speed changes. > > Yes, as speed = Svalue * over-ride, dividing by the over-ride leaves > you with just the S-value. > >> Should this be evaluated over more than one program cycle to accommodate >> differences in timing between the two signals. > > I would be tempted to compare with an "old value" which is only > updated if the difference is more than a certain amount. That's exactly what I plan to do, but still thought the values might get out of sync for a program cycle or two while the override is being changed. I'll probably have to do some testing. Thanks. Karl ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2dcopy1 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
