RE-LOADING THE BOBBIN CORRECTLY

The bobbin will need to be replaced frequently, allowing only 30,000 to 60,000 stitches per spool.  This has to be done correctly every time.

     
   

1. Ensure bobbin turns clockwise. Pull thread through this slit.

 2. Feed thread through eye at the end of the metal tension flap.  
  4. Perform a drop test to check tension:  like releasing a yo-yo as shown on the right, follow these steps: 
      a.  Hold the loaded bobbin case by the free end of the thread - let it hang about 6-12 inches from your fingertips
      b.  Dip your hand downwards and bring to a quick stop (but not so suddenly the bobbin falls out of the bobbin case)
          You should cause enough downward momentum that, after your hand stops, the bobbin case should continue,
            unspooling downwards.
      c.  Watch for 1 of 3 things to happen:
               Correct tension: Bobbin case unspools slightly and stops.
               Too Tight:  Bobbin case does not unspool at all, no matter how many times you try the "drop" test.
               Too Loose: Bobbin case unspools continuously without you needing to dip your hand.
      d.  Adjust the bobbin tension by turning the larger of the 2 screws at the base of the tension flap (right) and
                perform the drop test again until the tension is correct.  If you happen to have a bobbin tension gauge,
                you'll find that this test should consistently set the bobbin tension correctly at 23 to 27 grams tension.
adjusting bobbin tension
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5. Pass the bobbin thread through the wire loop (shaped like an inverted "U" at the front of the bobbin case) and allow 4-6 inches to hang from it, down across the front of the bobbin case.

  

6. Insert bobbin case (into the basket of the rotary hook) and close the bobbin case door.  Be sure that the bobbin case is inserted COMPLETELY or the machine will fail to sew.