[Emc-users] Determine if a spindle speed change is from override?
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. 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. 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. Should this be evaluated over more than one program cycle to accommodate differences in timing between the two signals. Does anyone know a better way to do this? Thanks. Karl Cunningham -- 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
Re: [Emc-users] Determine if a spindle speed change is from override?
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) 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? 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. -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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
Re: [Emc-users] Determine if a spindle speed change is from override?
On 09/28/2011 01:56 PM, andy pugh wrote: On 28 September 2011 21:14, Karl Cunninghamka...@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
