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Singer 301 won't stitch properly, thread bunching up on underside

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Likely that it is a lower tension issue
Bottom tension is controlled by the bobbin case. First, ensure that the thread is wound tight onto the bobbin (should not be spongy when you push your fingernail into into it) Looking at the open side of the bobbin case, insert the bobbin into the bobbin case (so the thread winds off in a clockwise direction) and feed under the 'tension finger'. If you now hold the end of the thread, suspending the bobbin and case from it, the assembly should not drag any more thread out of the bobbin case. If it does, the small screw on the tension finger needs to be tightened slightly. If the assembly does not drag out any more thread, give the thread a little upwards tug. The assembly should slide down a little.If it does not slide, the tension finger is too tight - loosen it a little.
Insert a NEW needle, make sure the top thread is correctly threaded and tension is set at the 'normal' setting (as per book) ..... .... try sewing a sample. Note: using 'cheap' thread will cause all sorts of tension issues as well as fluff up your machine fast - avoid it!
Good luck

Posted on Apr 29, 2014

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Posted on Jan 02, 2017

  • 106 Answers

SOURCE: Can't get a neat straight and stretch stitch underneath

Sounds like a bottom tension problem, to be sure I would have to have a look, I would suggest you have it looked at. Not sure about the materials you are sewing and have serious doubts as to whether the machine you are using is up for the job and will give you a satisfactory finish. It is possible a "walking foot" machine is what you need.

Posted on Mar 26, 2008

  • 1116 Answers

SOURCE: my top stitch is flat, but the bobbin is bunching

What looks like a bobbin problem is sometimes the threading of the top thread.

If you threaded the machine with the presser foot down, the tension is closed and the thread cannot enter as it should.

Improper seating of the thread into the tension results in loopy stitching as the thread is not being guided at the proper tension to create a satisfactory stitch.

Try re-threading the machine with the presser foot up.

Posted on Feb 20, 2010

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