On 04/12/2016 10:40 AM, Jim Craig wrote: > I am helping a buddy build a plasma cutter. The z axis assembly we are > using includes a probe switch so that when the torch tip moves up a > slight amount relative to the normal torch position it will trip the > switch saying the torch is on the metal to be cut.
So you probe down until the switch on the Z assembly touches the work, and you use that Z level as your "top of material"? That sounds good. > It is simple enough to use this switch as a probe switch and we will do > so. However I would like to use it as a z-axis limit switch when a probe > move is not being conducted. > > Is there any reason I cannot use the motion.motion-type pin to disable > the switch as a limit switch during a probe move? It is stated in the > man page that it is a debugging pin. Interesting idea. So you would use something like this (.hal pseudo-code): Z-switch-in => motion.probe-input ((motion.motion-type != Probing) && Z-switch-in) => axis.Z.neg-lim-sw-in I can't think of a reason why that wouldn't work. It will mean the -Z soft limit is wrong since it is statically set to the largest possible value in the ini file, while the actual hard limit moves up and down as you load materials with different thickness on the machine. I wonder if you can set ini.Z.min_limit to the probed Z value as part of your "find the top of material" subroutine. I'm not sure how that would all behave, but i'd love to hear your results! > Is there a better way to do this? Not that I can think of. -- Sebastian Kuzminsky ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
