Hi Michal. You are using 5i25 + 7i77 + 7i76 from Mesa . Well done !
On Wed, Aug 27, 2014 at 8:42 PM, alex chiosso <achio...@gmail.com> wrote: > Hi Michal . > Your application is really impressive !!! > Are you using open o closed loop , stepper or servo motors ? > For the program did you develop or use a sort of CAD/CAM to design the > pattern ? > How do you synchronized the needle movement with the X-Y axis ? > As I understood the needle movement is used as a "spindle" , isn't it ? > Or it's an axis ? > What kind of electronic are you using to control the motor drives ? > Thank you for any detail you can share. > > Regards > > Alex > > > On Wed, Aug 27, 2014 at 8:23 PM, Michał Geszkiewicz <mic...@wp.pl> wrote: > >> Hi Alex, >> >> I've done few retrofits of simillar machines, video below. >> Originally spindle speed was fully synced with xy velocity but was >> disabled due to mechanical problems (it won't saw on lower speeds). >> http://www.youtube.com/watch?v=aopjsU7Q5V8 >> >> regards, >> Michael >> >> W dniu 27.08.2014 19:44, alex chiosso pisze: >> > 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 . >> > This is mainly related to the speed needed for the sewing cycle . >> > As early the enable for X-Y movement is triggered as fast the machine >> can >> > work. >> > The worst case is if the X-Y movement is not at target position before >> the >> > needle is starting to touch the fabric. >> > So in the current application I made , the position controller that >> manage >> > the needle (Z axis), raise a digital output starting from a position >> > related to the position of the needle outside the fabric when the >> stitch is >> > made till the needle position close to the next stitch entering point. >> > If the X-Y axis are still moving when the needle is close to touch the >> > fabric , the machine stops. >> > So the limit is also the maximum stitch length related to the needle >> speed. >> > And also the needle make a number of rotations as the number of stitches >> > that have to be made. >> > The needle finish is cycle always on top position (same position that >> > starts the cycle). >> > I hop I'm clear enough. >> > The best solution should be to have the X-Y axis geared in electronic >> cam >> > (with adjustable ratio for the stitch length) with the needle (Z axis) >> to >> > be close as possible as the mechanical traditional machine. >> > In this case there is no problem with the working speed (stitches per >> > minute). >> > >> > >> > >> > On Wed, Aug 27, 2014 at 7:14 PM, Philipp Burch <p...@hb9etc.ch> wrote: >> > >> >> Hi Alex! >> >> >> >> Sounds like an interesting thing to do :) >> >> Do you need full control over the needle (i.e. coordinated moves), or >> do >> >> you want to let the needle be driven by a single motor in continuous >> >> motion and synchronize the X/Y movements to it? In the latter case, you >> >> would only need position feedback from the needle, which could be as >> >> simple as a single switch telling you when the needle is up and the X/Y >> >> can move. >> >> With LinuxCNC, you could then hook that switch signal to the adaptive >> >> feed input, so that the position is freezed whenever a stitch is being >> >> made. If you then connect the velocity command for the needle motor to >> >> the spindle control, you could really write a program just like for a >> >> mill (except no Z of course). So you'd use G0 to rapid to the starting >> >> point of the sew, then set the desired spindle speed using S, start the >> >> "spindle" and program your path using G1/2/3. The combination of >> >> spindle/needle speed and feed rate would give you the stitch length. >> >> >> >> Oh, and I'd go for motors with position feedback if possible. Open-loop >> >> driven steppers may seem easier to handle as usually no loop tuning is >> >> required, but then you need to test veeery carefully how fast you can >> go >> >> without losing steps. Especially if you want to move really fast and >> >> have a variable load. >> >> >> >> Just a few thoughts. >> >> >> >> Regards, >> >> Philipp >> >> >> >> On 27.08.2014 18:55, alex chiosso wrote: >> >>> Bari , thank you for your reply. >> >>> How is working a sewing machine for me it is clear (I really did the >> >>> application I described). >> >>> I read into a Brother industrial sewing machine user/maintenance >> manual >> >> and >> >>> their electronic control manage encoders >> >>> for the motors. >> >>> >> >>> >> >>> On Wed, Aug 27, 2014 at 6:42 PM, Bari <bari00...@gmail.com> wrote: >> >>> >> >>>> Alex, >> >>>> >> >>>> We started using Linuxcnc to control all sorts automation in the lab. >> >>>> >> >>>> Breaking down the steps to stitch: >> >>>> >> >>>> Move X,Y to start of the stitch (with Z at max height) >> >>>> >> >>>> Move Z down to min. (needle to lowest point) >> >>>> >> >>>> Raise needle >> >>>> >> >>>> Start Loop (spin looper motor) >> >>>> >> >>>> Finish Loop >> >>>> >> >>>> Needle to max height >> >>>> >> >>>> Move X and/or Y >> >>>> >> >>>> >> >>>> https://www.youtube.com/watch?v=BAvQBLHMrw4 >> >>>> >> >>>> On 08/27/2014 10:58 AM, alex chiosso wrote: >> >>>>> Hi Bari. >> >>>>> Nice to know you. >> >>>>> Have you experience with this particular application ? >> >>>>> So for you closed loop positioning it's not needed ? >> >>>>> >> >>>>> >> >>>>> On Wed, Aug 27, 2014 at 5:52 PM, Bari <bari00...@gmail.com> wrote: >> >>>>> >> >>>>>> Alex, >> >>>>>> >> >>>>>> I'd use Linuxcnc to build it. >> >>>>>> >> >>>>>> You can use steppers to control the needle motor and looper in open >> >>>>>> loop. Your G-code could be written to just stop X and Y when the >> >> needle >> >>>>>> is below the surface of the fabric. >> >>>>>> >> >>>>>> On 08/27/2014 10:21 AM, alex chiosso wrote: >> >>>>>>> The application can appear "trivial" but it is not especially >> because >> >>>> of >> >>>>>>> needle speed and sycronization between the needle position and the >> >> X-Y >> >>>>>>> movement. >> >>>>>>> During the sewing the X-Y can move only when the needle it's >> outside >> >>>> the >> >>>>>>> label otherwise the needle can be broken and the clothe/label can >> be >> >>>>>>> damaged . >> >>>>>>> That's why the position feedback is needed. >> >>>>>>> Additionally the command for some actuators sycronized to the >> sewing >> >>>>>> cycle >> >>>>>>> + sensors, pushbuttons, button lamps management. >> >>>>>>> I would like to discuss with you what do you think about the >> >> conversion >> >>>>>> to >> >>>>>>> LCNC. >> >>>>>>> >> >>>>>> >> >>>>>> >> >> >> ------------------------------------------------------------------------------ >> >>>>>> 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 >> >>>> >> >>>> >> >>>> >> >> >> ------------------------------------------------------------------------------ >> >>>> 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 >> >>> >> >> >> >> >> >> >> ------------------------------------------------------------------------------ >> >> 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 >> > >> > >> >> >> >> ------------------------------------------------------------------------------ >> 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
