The problem is the air wrench turns freely unlike the electric impact wrenches. So if it even just drops on the wrong point it then stays there and tracks the spindle turning. Been there. Tried that. John
> -----Original Message----- > From: Gene Heskett [mailto:ghesk...@shentel.net] > Sent: November-22-21 7:06 AM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Spindle positioning. > > On Monday 22 November 2021 07:01:27 Roland Jollivet wrote: > > > You probably don't need more than 1 bar on the lifting air cylinder, > > up or down. No need to force it down. > > So let it down, then if you can give the spindle a 1RPM burst to let > > the nut slip over. > > And have a switch on driver Z to know if it's down over the nut. > > > > You could also stop the spindle and descend the driver as the spindle > > reaches it's last 5RPM? before stopping. > > With my spindle, it would be stopped before it dropped a mm BUT rig a > lever to push the lock pin AND have the motor running at gear change > speeds. The wrench would fall, pressing on the lock pin, put half a bar > down pressure one second after initiating the move, the spindle would > match the nut and the socket falls over it. At that point it all turns > until the lock pin falls into the hole which would close the engaged > switch telling linuxcnc to stop the spindle, the wrench is in position > to initiate the unlock. bring in the carousel, do the unlock, terminate > the unlock on the second pulse from the magnet. The tool should drop > into the waiting carousel pocket it came out of. Raise the head for > clearance to turn the carousel, turn it to the selected tool, drop the > head onto that tool and drive the air motor in the oposite direction > long enough to get a good grip on the tool. raise the head, get the > carousel out of the way and lift the air motor and socket back off the > nut, releasing the lock pin. Give it a second to hit the upper stop, and > let linuxcnc restart full spindle control. No spindle to nut > positioning needed. M6 t# is done. Most of it is sequenced by classic > ladder code. restart the spindle in creep speed fwd to release the pin > and nut at the end of the lockup. Tally switch the upper stop to let > linuxcnc know its safe to TLO measure this tool, spin up the spindle and > get back to work. Whats not to like? > > > Roland > > > > On Mon, 22 Nov 2021 at 10:03, John Dammeyer <jo...@autoartisans.com> > wrote: > > > > From: dave engvall [mailto:dengv...@charter.net] > > > > > > > > On 11/21/21 9:24 PM, John Dammeyer wrote: > > > > > Is there a way to tell the spindle to turn until it finds the > > > > > index > > > > > > and stop so it's always stopping at the exact same spot? Like > > > > > > > decelerate to 0.5 rev per second (30 RPM) or slower and stop when > > > > the > > > > > > index happens? With either an M5 or the button on the > > > > > > > user interface? > > > > > > > > If I were? doing that? today I would use 3 sensors. IOW a guard > > > > sensor either side of index, rotate quickly to detection of guard > > > > slow way down and search for the central sensor. How you know > > > > which is the shortest path is left as an exercise for the > > > > "student". ;-) Or maybe one simply defaults to searching in one > > > > direction. > > > > > > > > If you don't need orientation then a stepper motor and a gear > > > > would seem to be as simplistic as one can get. > > > > > > > > Dave > > > > > > One still has to line up the socket to the hex head of the drawbar. > > > And since it can be at any position relative to the spindle the > > > sensing has to happen against the hex head. Rotate spindle until > > > hex head is at a known position. Then rotate socket from and > > > indexed position until it matches the socket and then send it down. > > > This could all happen in under 100mS and be almost transparent to an > > > end user. > > > > > > There are times where I wish I had BMT-30 cone type tooling or just > > > only TTS. > > > John > > > > > > > > > > > > > > > _______________________________________________ > > > 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 > > > 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, 1940) > 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
