Question about Janome Memory Craft 4000 Sewing Machine

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Bobbin thread bunching

After about an hour of sewing on my Janome Memory Craft 4000, the thread begins bunching on the underside of the fabric and gets increasingly worse. There is also a terrible racket coming from the bobbin case area that gets progressively louder. What I have done so far: had the machine completely serviced by an authorized dealer in Sept. 2007. I had only minor stitching problems before service. Machine sewed fine under sporadic sewing conditions until this week when I began sewing with a deadline on quilted art projects. These are linen or silk over flannel so I'm not asking the machine to do heavy duty sewing. Monday I took the machine into a sewing machine person who adjusted the tension top and bottom. It worked beautifully about 3 hours. Then the problem began all over again. I turned the machine off for the night and it is stitching a little better this morning, but it is still noisy and I predict that it won't take much sewing before the thread begins bunching on the underside of the fabric. Help, I have a big deadline and need my machine. Short of throwing it into the river or buying a new machine, what can I do? Thanks, Sandy

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  • sandymom Feb 24, 2008

    Thank you. Your reference to adjusting tension that you posted for someone else was very helpful. sandymom

  • Anonymous Mar 25, 2014

    top thread gets entangled in shuttle often and i need to dismantle the shuttle atleast 10 times before stitching a frock. its a new single singer sewing machine



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I agree with brodering about the damage to your bobbin case, it should be smooth all over, as the thread travels across the top surface to form a stitch, and the small step on the underside locates it as the hook spins underneath.

Needle strikes often compromise the surface, as will the hook colliding with the under surface... and although it is possible to gently polish off the damage with fine grain wet & dry (black) sand paper (emery paper) there are limits to the success depending on the degree of damage.

While on the subject, ensure the bobbin case and hook race beneath are clean and free of lint or thread.

For a guide as to setting tensions and the rest, look here

Posted on Feb 24, 2008

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Remove your needle plate, and take out the black bobincase. Check the edges on the black bobbincase for scratches or damages. The upper tread should glide smootly around the upper edge of this bobbincase.

If you find any scratches, you may use a very fine sandpaper/grindingpaper (not shure what you call this in english) to remove the scratches.

Posted on Feb 23, 2008


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When sewing after 5 mm the top color cotton is building under the material and stops.I opened it up clean the dust and still the same. can some one give me a hint please . thanks."?"

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