Superior Threads

So Fine vs. Tin Lizzie

Q.  I just finished one quilt and loaded another.  Now my thread keeps
breaking. I'm using Superior Threads So Fine #405 in my bobbin and also in the
needle.   I have the Tin Lizzie 18.  I've checked everything I can find
to check.  The needle is threaded correctly, is inserted properly,
and is straight.  I've cleaned in and around the bobbin and it's case. 
The thread is coming off the cone properly and not getting caught on
anything.   I've tried 5 different bobbins, Groz Beckert size 16 and
18.  Can you make any suggestions for me as to what might be the problem.


A.  Do you have more than one cone of So Fine to test?  If Cone A works but
cone B does not, then it might be a bad cone.  However, if neither work,
then it is a machine setting.  So Fine is usually a trouble-free thread.  Thread breakage is usually due to one of these:
    1.  Needle (perhaps a burr in the eye).  Size #16 is adequate for So Fine.
    2.  Too tight tension.   The thread should pull easily through the
         needle by hand.
    3.  Rough spot or burr somewhere along the thread path.
    4.  Too tight bobbin tension.  The bobbin tension should be loose enough
so when you hold the bobbin case in your left hand and pull up the
thread with your right hand, the case does not lift up off your hand.