Question about Vacuums
Have you run a length of stitching with different color threads for the upper thread and the lower? Since the upper tension appears to be too loose, turn the tension knob to the right by 1/2 a number. This is a lower number (on my machine); so you'd go from 5 to 4.5. (It works just like most plumbing; turn right to tighten and left to loosen.) Then run another run of test stitching.
You may also need to check the lower tension but only as a last resort. There is a set screw that adjusts this; turn to the left to loosen and right to tighten (1/8 of a turn at a time). On one of the machines I have used, the bobbin case is easy to remove. For that machine, the test is to put the bobbin in the bobbin case and check what happens when you dangle the bobbin case by holding the thread. The thread should move when pulled but shouldn't pull more thread out of the bobbin when the bobbin case is dangling.
My sewing machine manual explains this adequately. However, I found better pictures in a volume called the Singer Sewing Book. Similar pictures are available here: http://www.ca.uky.edu/HES/fcs/FACTSHTS/CT-MMB-213.pdf . This is from an Extension Service site.
I hope this helps.
Posted on Mar 22, 2011
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Posted on Jan 02, 2017
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