Question about Bernina Sewing Machines
I've been told many times (and it still doesn't always sink in), the first thing to do is change the needle. And make sure to use the correct size and type of needle for the thread being used.
Be sure the presser foot is raised BEFORE you thread the machine.
Perhaps the tension mechanism is dirty, loose or broken. Try pulling unwaxed dental floss through the tensioner (always pull forward, NEVER backward).
The bobbin thread holder should always unwind in the clockwise direction inside the bobbin case.
If none of these solutions work, then it may need a trip to see a Bernina technician
Posted on Feb 09, 2015
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Posted on Jan 02, 2017
SOURCE: janome straight stitch loose
I don't know if this is the right answer for any of you, but thought I'd put my 2 cents worth in. Often this can be the bobbin in backwards. It needs to unwind a certain way depending on the machine. I've heard a phrase for this: Mind your p's and q's which means some wind off to the right like a q, others to the left like a p. Mine has to unwind one way then be slipped backwards into a little slot or it does that loose bottom thread looping and bunching someone here mentioned. It seems everytime I get that problem I rethread the top thread 100 times before it clicks again and I remember it could be the bobbin thread. Either your manual will tell you the correct way, or you could experiment and try one or the other. Once you figure out whether you're a p or a q, mark it on your machien somewhere to remind yourself.
Good Luck and Happy Sewing!
Posted on Apr 04, 2009
If you threaded the machine with the presser foot lever raised and the stitching is still loose, the tension control may need a new spring or the entire control may need to be replaced.
Berninas tend to be the only brand that hold their value and it would be worth the expense to take it to an authorized Bernina dealer for service and repair.
Posted on Mar 25, 2010
SOURCE: bottom thread too loose; tried
Check for correct bottom thread tension.
It's provided by a flat spring on the bobbin holder.
When the bobbin is correctly installed, pulling on the thread
should meet with slight resistance, and the bobbin should spin without
trying to jump out of the bobbin holder.
Posted on Dec 18, 2010
If you are using buttonhole twist or heavy topstitch and normal thread underneath machine tensions wont like it. Try using regular thread top and bottom but use two same colour on top and thread both through needle but put one either side of tension discs if you can. Top stitching jeans is problematic for manymachines even Berninas
Posted on Jan 13, 2012
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