Singer Sewing Machine Instruction Manual page 23

needle is at bottom dead center. (See fi g. 16A) The hook
rotation is critical, and the range of rotation is small, if set
too far outside this range the machine may not sew at all
or have skipped stitches.
When the point can not catch the loop of thread
formed by the needle, the hook point is set too close to
the needle. If this happens it will result in all skipped
stitches. On the opposite end, if the hook is too far from
the needle, by the time the hook point gets to the loop the
thread is too high to be caught. When properly timed, the
hook will catch the loop consistently. (See fi g. 16B)
fi g. 16A
fi g. 16B
Timing is correct when the point of the hook is
just in line with the needle and approximately 1/8"
above the top of the eye of the needle.
Bottom
Dead
Center
23