Singer Featherweight Service Manual



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The manual is split into multiple parts. Pictures are the original but the type has been reset for clarity. This was intended for trained engineers – only take on jobs with which you are comfortable.

Part 11
Index –– Part 2 –– Part 3 –– Part 4 –– Part 5 –– Part 6 –– Part 7 –– Part 8 –– Part 9 –– Part 10 –– Part 12 –– Part 13 –– Part 14 –– Part 15 –– Part 16 –– Part 17 –– Part 18 –– Part 19 –– Part 20 –– Part 21 –– Part 22 –– Part 23 –– Part 24 –– Part 25 –– Part 26 –– Part 27 –– Part 28

Index –– Part 2 –– Part 3 –– Part 4 –– Part 5 –– Part 6 –– Part 7 –– Part 8 –– Part 9 –– Part 10 –– Part 12 –– Part 13 –– Part 14 –– Part 15 –– Part 16 –– Part 17 –– Part 18 –– Part 19 –– Part 20 –– Part 21 –– Part 22 –– Part 23 –– Part 24 –– Part 25 –– Part 26 –– Part 27 –– Part 28

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TO ADJUST NEEDLE THREAD TENSION

CHECK:

With machine threaded, lower presser bar to engage tension and turn tension regulator dial to zero (0) position, Fig. 21. Hold thread on both sides of tension regulator and pull back and forth through tension discs. The tension on the thread should be just slightly perceptible, which gradually increases with the turning of the regulator dial to the right.

SETTING:

If the pull on the thread is too strong for minimum tension, press in numbered dial to disengage pin in thumb nut, Fig. 21, from dial. Reset pin in next hole to the left of previous setting. Repeat process until there is no tension on thread. Then advance pin one hole to the right to produce minimum tension at zero (0) position


TO ADJUST BOBBIN THREAD TENSION

CHECK:

Remove threaded bobbin case and bobbin from machine. Hold end of bobbin thread allowing the bobbin case and bobbin to hang free. When tension is correctly adjusted, the bobbin case will descend slowly each time the thread is given a slight "jerk" upward. When using a tensiometer, a bobbin thread tension of approximately 50 grams is sufficient for No. 50-3 mercerized cotton.

SETTING
:
Gradually turn tension regulating screw for either increased or decreased tension, as shown in Fig. 22.


TO ADJUST BOBBIN WINDER PRESSURE

CHECK:

The pressure of the bobbin winder pulley against the belt should be just enough to operate the bobbin winder without slippage.

SETTING:

Tighten adjusting screw, Fig. 23, sufficiently to increase pressure of pulley against belt.