Bernina Virtuosa 150 Top thread is monofilament, bottom is regular thread.....I've adjusted to all sorts of tensions and cannot get it to work! Trying to machine applique using hem stitch and the top thread creates a nest underneath the fabric and the bobbin thread isn't catching....please help! I've rethreaded, and tried just about everything I can think of.
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I would suggest that you don't use this thread, it is too fine for the tension device on a domestic sewing machine, and they just don't like it. Too strong, too fine. Its best used in industrial blind hemming machines, if you look at RTW trouser hems you'll often see monofilament utilised here.
Put the thread spool on the vertical spool holder with a sponge pad underneath. Wind the thread off the spool and through the small wire thread guide next to the spool holder. Take the thread across the top of the sewing arm to the tension unit just next to the gap in the case through which the thread is normally threaded - the tension unit looks like the top of a shiny screw without the slots in it. Wind the thread in a clockwise direction around the tension unit once and pull the thread with a bit of tension until it slips into the sprung gap around the underside of the shiny part. Slip the end of the thread through one of the holes in the bobbin and, preferably, wind a few turns on, then push the bobbin onto the bobbin winder shaft at the right-hand end of the top of the machine. Turn the bobbin clockwise by hand a few more times to make sure the thread is 'locked' onto the bobbin and then just push the lever adjacent to the bobbin winder to the left. To wind the bobbin, you then press the foot controller and either stop when you've got enough thread on the bobbin or let it stop automatically when full. Make sure you dont go so fast that the spool rattles-around on the spool holder otherwise this could spoil the way the bobbin gets filled.
When you are threading the machine make sure that the presser foot is up, The tension disks are open when the presser foot is up, If you thread the machine when the presser foot is down the tension disks are closed, and the thread will not go through properly causing a nest of thread of bobbin thread to bunch.