I now have two working relays with LCNC control via the BOB! Both rated at 10a 28vdc MAX. As I mentioned in another thread, I do indeed want to be able to switch polarity of the spindle (low or zero rpm) to achieve CCW rotation. I also want to be able to turn the spindle on/off. Whether it's with these relays or more beefy ones as needed. A 3rd relay may be used to power the coolant or Air blast -- not sure. With two BOB's and parallel ports I have plenty of outputs / inputs available.
Just getting LNCC and my hardware to achieve this small success was a breakthrough for me :) On Fri, May 15, 2020 at 9:33 AM Gene Heskett <ghesk...@shentel.net> wrote: > On Friday 15 May 2020 09:05:22 andy pugh wrote: > > > On Fri, 15 May 2020 at 13:56, Gene Heskett <ghesk...@shentel.net> > wrote: > > > If the pix posted yesterday is the external relay in question here, > > > its a 10 amp rated contacts relay, and coil current to activate that > > > is going to be well beyond the bobs ability to deliver the needed > > > currant. > > > > I think that there are extra components on the relay board to account > > for that. > > There may be, but w/o its schematic we are both guessing. > > > > why not use > > > pin 14 of bob-0 which WILL have the boosted current > > > > Maybe he is using that for spindle on-off? > > in which case the OP, Dan, still has another identical relay on the 2nd > bob. He probably needs to use one for on/braking and the other for > reverse. This isn't quite conventional, but its a far cry from magic. > I've been there and done that with only one bob and didn't use that bobs > relay. But even a 2 stage braking relay setup was unable to match what > I've now done with no relays and one of Jons modified pwm-servo drivers. > > hal is NOT hard coded, so use its programmability as needed. Dan still > has not disclosed (to get my attention at least) what he will be using > as a controller, and I am trying to offer enough help such that the > smoke stays in the parts and the mirror is still in one piece. So I'm > trying to cover all the bases because I have also BTDT. Success is > relative of course, which is why I changed it, nominally alongside > making that lathes tapered gibs, what, 3 years ago. Both upgrades were > very worthwhile improvements. > > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
