Can you backdrive the impact wrench? Keep it engaged? On Mon, Nov 22, 2021 at 11:45 AM John Dammeyer <jo...@autoartisans.com> wrote:
> Thanks Roland, > What I've found is that once the socket has reached that midpoint between > flats it sticks there. Rounding off the edges of the inside didn't fix it > but did help. I can even shut off the air so I can pull it down slowly > against the return spring pressure and turn the spindle carefully by hand > and I can still make it stick in that one area. > > The problem with turning the spindle is that the socket spins freely in > the wrench so even the slightest bit of friction once it touches the nut > causes it to turn with the spindle. I tried 1RPM all the way up to 30RPM > and it didn't matter. The rounding of the nut and socket means 50% of the > time it works perfectly and the other 50% sticks. > > Also if my set screw is too loose then on the way up the socket pulls > out. And the set screw loosens after about 10 cylces. Hardened metal > against hardened metal doesn't work well. A softer screw didn't work much > better. Way to much rattle on the socket/driver connection. > > I never thought I'd have this much trouble... > John > > > > -----Original Message----- > > From: Roland Jollivet [mailto:roland.jolli...@gmail.com] > > Sent: November-22-21 4:01 AM > > To: Enhanced Machine Controller (EMC) > > Subject: [Emc-users] Spindle positioning. > > > > 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. > > > > 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 > > > > _______________________________________________ > 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
