Bernina Sewing Machines - Page 8 - Recent Questions, Troubleshooting & Support

What is your top tension set at?

Generally, service manuals are not available to the public. Only Bernina technicians have access to them unless they are sold privately. ...

it's very possible that the machine is slightly out of time & needs to be service at a sewing machine shopis the fabric & thread & needle compatable with each other?did you use every thread guide when threading the machine?is the bobbin in correctly?is the bobbin warped?

Mono thread can develop a memory and curl itself around things. I hate the stuff.

Are you sure you have the bobbin the right way round in the holder....when you look at the bobbin and tug the thread, the bobbin should move clockwise.
Pull out the foot pedal and use bsr2 with the start/stop button.
Bring bobbin thread to top of work before starting to sew. This may help knotting problem

How long since it's had a thorough oiling and cleaning? Wheel on right side that controls the needle up and down is very tight... Could also be the carbon brushes.

Check that you have got the thread correctly routed on the bobbin case and that there is noticeable 'drag' on the thread when you pull the thread out of the bobbin, in its case. If there's little or no drag, it is likely that the bobbin tension needs increasing. I'm assuming you've set the top tension to thered line. A good check is to load two colours of the same thread type top-and-bottom - when sewing on wide zig-zag, the top thread colour should be the only one seen on the top of the material and the bottom colour should be mostly seen on the bottom ... it's OK to have just a spot of the top colour showing on the underside on wide zig-zag/satin stitch.

Are you absolutley sure you're not getting a problem with stitch formation on, for example, wide zig-zag. Check again, using a different colour top and bottom and make sure that the stitch is being formed properly with only the top colour on top and bottom colour on the bottom. It sounds as though the bottom loop is not being picked-up by the hook properly. Make sure you've thoroughly cleaned-out any fluff under the stitch-plate and remove the hook/shuttle and give the hook race a good clean and give it a single drop of oil, even if you've got the lightweight part-plastic hook/shuttle fitted.

There are two tension adjustments, which should be done with a proper set of weight gauges - top and bottom thread tension should be carefully balanced to get the best stitch formation. It is best that you assume the top tension is correct and adjust the bobbin tension to match. Load the bobbin with thread of one colour and put a spool of the same thread but a different colour on the top. Thread-up the machine, load the bobbin and sew-off a satin-stitch on max width zig-zag. In this configuration, there should be a very small 'bead' of the top thread showing along each side of the satin-stitch on the underside of the material. If there's excessive top showing, the bobbin tension is too high and if none, the bobbin tension is too low. To adjust the tension, remove the bobbin case and you will see a spring around the edge with two screws through it. One of the screws holds the spring in place and the other adjusts the tension - this is furthest from the edge of the spring and is in a small 'cup' in the spring itself. To reduce tension, turn the screw VERY SLIGHTLY anticlockwise and to increase it turn it clockwise. Make very slight adjustments and re-check sewing-off the satin-stitch every time until you get the required thin line of top showing down each side of the stitch on the underside. Ideally this should be done with Mettler Metrosene thread, but as we're just balancing against the top tension, it shouldn't matter too much provided you use a good thread top and bottom.

have you tried changing the needle? have you tried adjusting the top tension?

try adjusting the top thread tensionalso rethread the top & bobbin,, to make sure the thread is not caught anywherealso try changing the needle

12 wt thread generally will not work well in the bobbin... "Aurifil 12wt Thread Aurifil 12 wt thread is ideal for hand quilting, big stitch hand quilting and machine quilting. 12 weight thread creates a more defined and often primitive look. It's great for designs that use a longer stitch length if using a machine. When machine quilting with 12 wt thread, use 40 wt in the bobbin, increase your stitch length, lower your tension, use Topstitch size 90 needles and stitch slowly."

Do you use stabilizer when you are satin stitching? I had a teacher who also hooped the fabric with a spring-loaded embroidery hoop (turned upside-down under the presser foot so the fabric is flat against the needle plate) that would keep the fabric taut. It is not uncommon for bobbin thread to rise to the top when doing embroidery, satin stitch, etc., especially if you are using lighter-weight thread than usual. You would normally loosen the upper tension so the upper thread will sink into the fabric. However, if loosened upper tension is not doing enough, you may need to adjust bobbin tension when doing embroidery, applique... You might try tightening the bobbin tension just a smidgen to get the bobbin thread to stay below the fabric. Be sure to mark the bobbin case before making any adjustments so you can return it to the original setting when finished with the satin stitch. (If you do a lot of satin stitch or applique, etc., you may want to invest in a separate bobbin case that is set up only for doing that kind of work--saves having to alter the bobbin tension frequently.) Sewing Perfect Satin Stitch Wildly Wonderful Wearables Patterns Notions... https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=0ahUKEwiRr76k0sbLAhXBKGMKHei6AfIQFggqMAI&url=http%3A%2F%2Fmachinequilting.mqumag.com%2Fwp-content%2Fuploads%2F2014%2F12%2FSatin-Stitch-Techniques-Part-1.pdf&usg=AFQjCNFXYKp2C-RJEAAUMWwApqZlU895uQ&cad=rja

Mi Bernina 700 D no toma el hilo de la aguja izquierda, ¿Qu? debo hacer?
Gracias.

https://www.youtube.com/watch?v=LmEtmnkDIS8 First, make sure the bobbin-winding spindle (located on top of your machine) has been pushed back to the left for sewing. If it is not in the correct position, the needle will not go down and pick-up your bobbin thread. ... Make sure the presser foot is up when seating the thread through the upper tension https://www.singer.com/frequently-asked-questions.

It may be time to send it in for adjustment, There are several videos on youtube that you can watch that show in general how to set the timing on a sewing machine.

there is some video how to uses of machine: https://www.youtube.com/watch?v=1uIs-mazyrc https://www.youtube.com/watch?v=Wg9ehzOO6rw https://www.youtube.com/watch?v=sqxWyIxtp5A https://www.pinterest.com/pin/11892386485911846/

https://www.youtube.com/watch?v=vkN9WKfSFnM

https://www.youtube.com/watch?v=d-lim8xTjt8

Hi,
There is a spring loaded catch on the needle bar assembly. It is designed to keep the needle bar from going up and down on command for basting. That way it can take fewer stitches while basting. Anyway, over time, with lint build up, use and not enough oiling, the needle bar clamp release can stick. It is located in the machine cover and hard to get at. It is located right at the point where the needle bar clamp (middle of needle bar) is. It looks pointed on top and about 3/8" tall and SHOULD be able to move front to back (as you are sitting at the machine. If you want to fix it your self, lay the machine on it's back to see up into the needle bar area, you can also see through the threading slot as well.to oil it with SEWING MACHINE oil (read not 3 n1 oil) and try to work it front to back until it breaks free and play with it until it springs back every time you push it. I hope this helps.
Kent