Hello smallflame,
The looping on the underside of the fabric is due to the tension on the upper threading being to low. Try setting the tension dial to a higher setting. If this does not help, make sure that you are using the correct needle for the fabric you are stitching on. If the problem persists you should try rethreading the upper fabric.
Thanks,
Pat
SOURCE: thread on bottom, bobbin thread loose
Sounds as though you've misthreaded the upper tension. The best way to verify this would be to thread your machine, lower the presser foot on to the material. Now try pulling the thread through the needle. (Assuming your upper tension dial is set to a number greater than one). You should feel resistance. Should you not feel resistance, rethread your upper tension.
SOURCE: not picking up the bobbin thread
Make sure the needle is facing the right way. If it's in backwards it won't pick up the bobbin thread.
SOURCE: when I sew the back of the material thread is big
well errr???? im a man talking to you !!!! how would i know whats wrong here???? i cant stich a button on???? but ???? me thinks its not so much the bobbin thats not set right its the needle thred tensions that are wrong there far to slack, whats happening is the needle is stiching but the bobbin is not pulling up all the exess slack, you have missed threded the sewing machine? missing out the thred tenshion bit,,that or it's just not tight,,, crank it up tighter and see if this helps pull it up more under the stiching ? if im wrong slap me !
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