On Saturday 12 December 2020 21:12:08 Matthew Herd wrote: > Thanks all for the answers on this. > > Andy, I’ll give your and Jon’s solutions some thought and try one of > them. Thank you! > > Gene, it’s a Bridgeport BOSS 5, which is a factory CNC knee mill > heavily based on the standard Series 1. The head is virtually > identical to a manual Series 1 machine except for the motor and quill > arrangement. So all Bridgeports will reverse spindle speed on > backgear. I understand the ratio is approximately 8.3:1, but I > haven’t been able to verify that. > > Jon, I have two USC boards on the same parallel port. I think there > is a bit of a clarity issue in the documentation here: > http://www.linuxcnc.org/docs/html/drivers/pico-ppmc.html > <http://www.linuxcnc.org/docs/html/drivers/pico-ppmc.html>. The > loadrt command references parallel port addresses. Then the > extradac=0xnn explanation indicates that a second board on the same > parallel port should be referenced as 0x02. Then later, the pins > enumerate as ppmc.<port>…. with <port> being the parallel port, not > the board ID on the bus. I understood port to refer to the ID on the > bus, so I assumed the second board would be ppmc.02…. instead of > ppmc.00… with the channel or pin number enumerating consecutively. > Which raises the question of how the inputs and outputs will be > enumerated for the second board. Will the second board inputs > enumerate as ppmc.00.din.16.in through ppmc.din.31.in and the outputs > as ppmc.00.dout.08.out through ppmc.00.dout.15.out? I haven’t yet > installed the second USC so I haven’t been able to test both on the > same parallel port bus. > > Secondly, I had a few questions about your -1/+1 multiplication for > the spindle speed. I just want to confirm that if I command an M3 > S-1000 (assuming a plain configuration as shown in my current config), > the spindle will run in reverse without any other input. > > > On Dec 12, 2020, at 11:53 AM, Jon Elson <el...@pico-systems.com> > > wrote: > > > > On 12/12/2020 08:12 AM, Matthew Herd wrote: > >> Hi All, > >> > >> I’m sure there’s a simple answer for my question, but I haven’t > >> been able to figure it out. Currently the configuration for the > >> spindle forward and reverse outputs is as follows: > >> > >> # connect spindle fwd/rev to I/O controller > >> net SpindleFwd <= ppmc.2.dout.00.out > >> net SpindleFwd => spindle.0.forward > >> net SpindleRev <= ppmc.2.dout.01.out > >> net SpindleRev => spindle.0.reverse > > > > ppmc.2 ??? You have THREE parallel ports with ppmc devices > > connected? Generally, you set the I/O port address in the line that > > loads the ppmc driver in the univ<xxx>_load.hal file, and it comes > > out as ppmc.0.xxxxx > > > >> I would like to selectively reverse direction depending on whether > >> a backgear input switch is triggered. I see there is a gearchange > >> component but I’m not clear on how to utilize it. > > > > No, don't use gearchange. Use mux2 to select either -1.0 or +1.0 to > > a signal depending on the backgear selector. Then, feed that to > > mult2 and multiply that by the spindle speed command > > (motion.spindle-speed-out) to feed the spindle-speed signal. If you > > already have a mult2 in there with some value to scale the speed of > > the spindle, then just use the mux2 to select between a positive and > > a negative of that value. > > > > I think this is the simplest way to do it, rather than reversing the > > way TWO different outputs work. > > It might, never tested it as the std reverse is to issue an M4, usuall on the same line as the S1500.
> > Jon 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
