Question about Bernina Bernette 75

2 Answers

My bobbin thread is making big loops

It had been working fine and then it just started looping on the underneath side.  I am using some heavier fabric.  I can't find my manual to troubleshoot.

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  • scangel86 Feb 07, 2009

    My machine is doing the same thing. I have adjusted the top tension all the way up and it doesn't help.

  • ssquared46 Apr 15, 2009

    This is so frustrating. I took your advicie and got a little improvement, but the loops persist. What I'm trying to determine is whether or not the Bernette is a fundamentally reliable machine. I was drawn to its comparative simplicity, thinking that fewer amenities might mean fewer problems and complications.

    When the loops cropped up today, I had been sewing for about an hour without incident. Nothing had been changed: not the threading, nor the adjustments to the tension controls, nor the fabric, and on. Then these big ol' loops, seemingly out of nowhere.

    So frustrating. I fiddled with everything for about an hour and a half to no avail.

    Dang.

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Bottom looping says upper tension problems (too loose). Rethread it making sure the presser foot is up so the thread is inbetween the tension discs.

Posted on Dec 12, 2008

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Change your needle. If you're using heavier fabric, use a denim needle.

Posted on Apr 15, 2009

  • ssquared46 Apr 17, 2009

    Actually, that was a temporary solution. Still not reliable. Talked to a shop today and learned that there could be a timing problem that needs adjusting. When a new machine comes out of the box, a reputable dealer will service it. Unfortunately, I bought it on eBay, so no adjustment. I've been flying blind.

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Big loops are actually easier to solve usually. 1st know this: Loops on bottom means the top is too loose or the bottom is too tight. With loops that big its probably the top is too loose. 1st look in tension disks, there is likely a chunk of thread in there. A toothpick is handy to dig it out (the flat kind) 2nd make sure that the thread is getting between the disks when threaded. 3rd Make sure the thread is in the take up lever (the thing that moves up and down in front and not the needle bar or any part of the needle bar.) If neither, then the bobbin case could have a burr on it and the thread is hanging on that burr. Also the bobbin case may be in wrong. I hope this helps
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Pull on your threaded bobbin thread while it’s in the machine. Does it pull smooth and even? If so, go to step 3. If not, try a new bobbin (bobbins get bent or distorted if wound too tight).
Clean thoroughly in the hook and bobbin case area and oil 1-2 drop is all.
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Sorry I missed your problem, I have just signed up on here to help with problems like yours.
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Folks in general are not aware that in addition to the top tension being set correctly so must the bobbin tension.
It is impossible to explain how to do this you need to be shown. However it should be explained how to do it in your manual.

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