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Top Tension knob too loose or too tight - H Test |
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I just did an H test and several of my
H's were solid color no bobbin
showing on the back. I can't remember if it is
too loose or too tight
and what to do. 
If your bobbin does drop an inch to an inch
and a half, then you will need to tighten the tension knobs. Always provide a
balance when turning these knobs, in other words if you do find that your bobbin
tension is good, then turn the small knob 1 whole turn clockwise, and then do
the same for the larger tension knob. Only sew one of the H's that are giving
you problems, and then fine turn the tension until you have it good, then make
the other knobs of the other threads knobs that are sewing poorly look the same.
THen sew out a complete H test.
Another test to see if thread path is
off, is pull the thread from one of the needles that are sewing good, but do not
unthread it, just pull it through the presser foot and towards you, note the
feel of the tension, and then match it up with one of the needles that are not
sewing as well, and then turn the knobs providing that balance I was talking
about until the tension on that needle feels like the needle that is sewing
good.
And only pull the thread with one hand, if you try to match the
feel with different hands you will not be able to tell, the mind cannot work
that way. Pull the thread with one hand and get a feel for the tension, and then
with the same hand pull the htread from the problem needle, and you will be able
to tell when you got the tension right. If after you've tightened the knobs and
you feel no difference in how the thread feels, than you may want to rethread
the needle, because somewhere from the cone to the needle the thread has come
off a wheel or one of the disks behind the tension knobs etc...
Allen Gripton
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