Singer Class 457 G 1 - To Set the Needle Bar at the Correct Height

TO SET THE NEEDLE BAR AT
THE CORRECT HEIGHT
Remove the rotary take-up guard which Is fixed by
two screws to the face plate of the machine. Through
the opening in the face plate loosen the needle
bar
set screw "AP", Fig. 20 in the connecting stud, just
enough to permit adjustment of the needle bar.
Use the setting gauge G-22970 (consisting of a .276
inch =
7.01 mm gaugeblockand a .815 inch = 20.70mm
gouge pin). The gauge block is assembled in place of
the throat plate
and the gauge pin is inserted into the
needle
bar to its stop. Turn the machine pulley until the
needle
bar is at Its lowest position and slide it down
ward until the plug touches the surface of the setting
gauge. Then turn the machine pulley until the needle
bar set screw Isvisible in the opening of the face plate.
Tighten the needle
bar set screw.
Ifa setting gauge is not available the needle bar mo*,
be set to the approx. correct height in combinatic
with a properly timed hook.
First make certain that the hook point is set to the
center line of the needle at the straight stitch setting of
the machine (= position 0 on the needle vibrating ad
justing dial) when the timing mark 0 on the face plate
is in line with the timing mark on the rotary take-up.
Then set the widest bight (= position 5 on the needle
vibrating dial), turn the machine pulley until the needle
is in the left position and bring the hook point to the
center of the needle. The hook point should now be just
slightly above the needle eye.
Caution: Whenever the height of the needle bar has
been changed check the relationship between hook
point to needle.
Figure 20
From the library of: Superior Sewing Machine & Supply LLC