Hi Gregg . The locking of the steps is fine in case of safety. The X-Y axis have always to complete the stitch lenght movement, otherwhise you obtain a non costant stitch lenght.
Hi Michal Thanks for the infos. A couple of questions more. How do you "synchronize" the needle movement with the X-Y axis movements ? How much is the distance between the fabric and the top needle position ? Alex On Thu, Aug 28, 2014 at 2:37 AM, Gregg Eshelman <g_ala...@yahoo.com> wrote: > On 8/27/2014 11:44 AM, alex chiosso wrote: > > Hi Philipp . > > You point to the right direction. > > I need a full control over the needle movement because I have to start > the > > X-Y movement before the needle is at top position . > > Easy enough to do. Find a place in the machine on the needle drive shaft > to place a disk and optical sensor. Have the disk block the sensor for > all of the rotation where the needle will be into the fabric and > unblocked from the time it pulls out to just before it goes back in. > > Might even be able to use a strip of aluminum tape partway around the > edge of the handwheel (if the machine has one) and a reflection sensor. > If the wheel has a polished rim, blacken or rough up part of the edge to > change reflectance. Attaching a more robust sensor and disk there could > work, but anything external like that in an industrial environment would > require a cover or guard. > > So sensor blocked = lock out all XY movement, unblocked = allow XY > movement. Should be able to connect that sensor to a command to > pause/unpause the step streams to the motor drivers. > > > --- > This email is free from viruses and malware because avast! Antivirus > protection is active. > http://www.avast.com > > > > ------------------------------------------------------------------------------ > Slashdot TV. > Video for Nerds. Stuff that matters. > http://tv.slashdot.org/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that matters. http://tv.slashdot.org/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
