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Topic: Sewing machine is being all evil and scrunching/pulling my fabric!  (Read 1351 times)
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ludicrouslouisa
« on: October 16, 2008 10:00:31 PM »

Help meeee
recently whenever I sew ANY kind of stitch on my mother's bernina Special 1000 it does this..
the top thread for some reason stays pretty much straight, as if it refuses to go into stitches, meaning the back thread has to do all the work with forcing it into stitch shapes.

the back thread goes all loose and bobbly, and crunches the fabric, as well as pulling threads out of the fabric.
I can't sew like this...it ruins the fabric and the stitching has practically NO structural stability if the top thread is too tight and the bottom too loose! Everything is set to the optimum tensions etc for straight stitch (I double checked in the book)
what is going wroooooong....
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Aislynn
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« Reply #1 on: October 17, 2008 07:09:54 AM »

First, take all thread out of the machine, clean, oil, and use canned air to dust.  Second, rewind a fresh bobbin, and reload it slowly, making very sure to put it in properly.  Third, change your needle.  Reload your top thread, again, going over every step thoroughly.  Now see what happens.  Fiddle with the tension.  Even if it says those are the "optimum" settings, they may not be right for the fabric that you're using.  Also, every time that happens to me, I've noticed it's because my top thread jumps, then gets wound around the spool pin, causing it to be very tight.  (Make sure your spool spins freely around the pin, and the thread isn't knotted or tangled.)   When you test it out, use a nice, starched, crunchy cotton, doubled over.  That's what most sewing machines like the best.

If none of that solves it, I'd take it in for a tune up.  But then that's about where my sewing machine knowledge taps out.  Good luck!
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SpottedFrog
« Reply #2 on: October 17, 2008 09:00:56 AM »

Everything she said Smiley

Is that a super close up picture or is that a very thick thread? What you are sewing with can affect tension too.
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ludicrouslouisa
« Reply #3 on: October 17, 2008 02:58:07 PM »

It's a standard all purpose sewing thread - that's a super close up picture.
I think my needle is a bit too thick for the job but I don't have a thinner one I can use.
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« Reply #4 on: October 18, 2008 02:41:37 AM »

It's a tension problem.  The top thread tension is too tight - I would loosen it up.  It also looks like the bottom thread tension is too loose.

When tension is set properly, the parts where the threads twist over each other (for lack of a better way of putting it at the moment) will meet exactly in the middle of the fabric, so you won't see the bottom thread coming through to the top of the fabric like I can see in your top picture.  And it won't bunch like that, either.
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