Greetings all; It looks like if I want to control a relay to run a vacuum to suck up the wood dust, and I only want it to run when commanded, I will have to use a charge_pump to get around the 5i25 that sets everything high when linuxcnc is shut down.
Looking at its man page, it says base-thread, but all I have available is a 1 millisecond servo-thread. I assume then that this thing will toggle its output at 500 Hz when used in this manner? That leaves me with a capacitor on pin 16 of this Mach3 BoB to a pair of 1n914's with the + output driving a TIP-31 which in turn will energize the control relay. So I'll need to mylar caps, one to transfer the square wave at whatever source currant this BoB can muster up, to a 2nd cap that will need to store enough charge to keep the transistor turned on fairly hard as long as the pump is running. but turn it off, albeit slowly a few milliseconds after the pump shuts off. Is there a rule of thumb to apply to find the optimum capacitances for thus usage? In the meantime I'll go play at getting it hooked up in .hal. However, this is a good time to ask about the disparity between hals ability to control the flood independently of the mist, which I am useing for something else, and the M7-8-9 gcode commands. the halui facilities can control these without any interaction, but the gcode M# version shuts both off when the M9 is issued. I believe I can sequence this in the code so that only one is enabled at a time, but if I should get sloppy, it could put my jigs location bar in the field of the cutting tool and get it all chewed up. Comments, workarounds for this? Thanks. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
