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WI Lori

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A lady at the quilt show mentioned an issue with her machine breaking (she believes) the bobbin thread. She has had it in for service twice. Once they claimed it was a burr, the other time they rebuilt the bobbin case. Yet still it breaks thread.

She says the needle is in correctly, and per sm techs has thrown out all old thread.

I'd like to help, if I can. I do not have the machine with me. Thoughts, oh esteemed vsm gurus?

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Lori in Wisconsin
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Zorba

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Troubleshooting machinery by email is always an "interesting" proposition. It gets a bit harder when the machine in question is invisible, and an unknown model as well! [wink]
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WI Lori

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Yup, but it is a slantomatic with zig zag, big round button on the arm, so that narrows it down a bit. She bought it new, and it was her only machine until 3 years ago.
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Lori in Wisconsin
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Cari-in-Oly

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I'm wondering if the person she took it to knew what they were doing or if it's really the bobbin thread breaking. I don't think I've ever had a bobbin thread break. The tension or the escapement(?) adjustment would have to be almost too tight to sew with before the thread would break. If it is the bobbin thread then the thread is still catching on something.

Cari

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ke6cvh

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How often does it break?  Is she trying a new style of bobbin?

Best regards,
Mike
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WI Lori

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I just heard back. It is a 403. I've offered to take a look at it, and will report back. Thank you, everyone. Stay tuned. [wink]
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Lori in Wisconsin
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Madmurdock75

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Quote:
Originally Posted by WI Lori
I just heard back. It is a 403. I've offered to take a look at it, and will report back. Thank you, everyone. Stay tuned. [wink]


The only time I've had that happen, it was from the bobbin. Some have that rolled bit of metal attaching the sides to the middle. Those can have a sharp part that breaks thread. Try one of the bobbins that's all one piece- one of the old ones - and see if it helps.

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Miriam

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Thread will break if it is the wrong type bobbin. Make sure it is a class 66 not a class 15 or some other.
Thread will break if the bobbin is damaged. Burrs, rust, bends, etc.
Thread will break if the bobbin has a burr or has the little clip sticking up in the center.
Sometimes newer bobbins just plain aren't made well.
There could be dried up oil somewhere in the thread path.

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