Hi, Old drivers was left and they are step/dir servos, encoders were wired up to 7i77 so it was closed loop step/dir servo. Company is using specific cam for quilting designs, don't know name (name was somehing like WINPROG, WINPRO, PROGWIN). Needle has one parameter in hal - speed nothing more. gui from requested needle rpm and width of sewing and max machine velocity calculate RPM needed to achieve sew length at max machine velocity. then that velocity is scaled down in hal according to xy velocity. So let say machine max vel = 6000 mm/min = 100mm/s req needle RPM is 3000 = 50 rps sew width is 3mm
if you run machine at 6000mm/min with rpm 3000 then it will sew 2 mm. so to make 3mm you must slow down req RPM to 2000 regards Michael W dniu 27.08.2014 20:42, alex chiosso pisze: > 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. 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