I recently had my machine cleaned and the top thread is coming out "grungy"...oily...i'm afraid it was oiled? I have taken the whole machine apart and recleaned it myself...it is a VERY fine silvery substance on the thread so i can't so with white thread at ALL...PLEASE HELP!!
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Re: Bernina Virtuosa 150 Quilters Edition
I would start out by putting some cleaner (409) on a q-tip and run it everywhere the thread touches. Guides, tension discs, the under side of the needle plate gets missed alot. Around the hook casing. Then I would just keep sewing on scraps, I know this wastes thread but eventually it will clean itself. A very close zigzag satin stitch would work best.
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Did you mention this specifically to the repairer? Could be a number of things ..... needle, timing, needle clearance to the hook, burred hook...... all of which should have ben checked when it was serviced. Was there a sample (sewn out by the repairer) with the machine when you picked it up? ie to 'prove' it was working correctly.
Check that the thread is tight around the bobbin. Make sure that the bobbin is in the right way around - the bobbin thread should double back on itself coming out of the bobbin holder. The bobbin tension adjustment is the small screw in the plate on the bobbin case that the thread passes under as it comes off the bobbin and goes out.
There is nothing up top to oil on this machine. Don't oil anything up there. Its ok to take the side cover for the needle bar off and oil any two metal parts that move togeather. But just a drop. More can cause you bigger issues when it collects more dirt etc. In my experience when these machines don't get serviced regularily I find squeeking from belt tensioners and hook drive areas. These need to be taken apart and cleaned and oiled or greased. By a Certified Bernina Technician.
Is this the top thread or your bobbin thread? The technician should have pulled out the tension disk assembly and cleaned it, not just spray more lubricant/cleaner on it. Is this a Bernina certified shop?! Take it back and get him to do it again right, it sounds like carbon/dirt build up in the disks. Have him pull the assembly apart and make sure it's not something else wrong with the disks themselves like oxidization etc.
If it's your bobbin thread.. your bobbin case is just dirty and the spring needs to be cleaned.
The thread doesn't really touch any other parts of the machine, hopefully your technician isn't using grease as this just causes more headaches for attracting more lint and then dirt.
It looks right but its not. Try looking on the internet for threading instructions. The bobbin winds in two directions, I have never saw a Bernina but I have 2 new machines and the thread goes in and then threads back to the left. Its hard to describe. But if the bobbin isn't right it will not pick up the thread. Write to Bernina for instructions. There are websites that have the directions for free.