Check the Rotational Timing of the Shuttle Gib Hook
The shuttle gib hook (p. 71,
16
) is driven by the shuttle driver (
15
). To change the rotation of the
hook, the driver must be repositioned on the lower shaft (
14
).
1.
Turn the Power Plus™ Flywheel so the
gib hook point is at its furthest position
counterclockwise (
74
).
2.
Measure the distance between the gib
hook point and the needle. The driver
is correctly positioned when the point
is between 1/8 inch and 3/16 inch
counterclockwise of the needle with the
hook held fully counterclockwise, closing
the gap mentioned in the prior section (
A
).
If spaced properly, the driver is set
correctly. If not, continue on to adjust
the driver.
3.
The driver is secured to the lower shaft
with two set screws (
75
). Loosen the
screws (
B
) and gently twist the shuttle
driver. Keep the driver from sliding left or
right on the shaft. If the fit is tight, carefully
use a screwdriver as leverage.
After adjusting the rotational timing
of the gib hook, you may need to
adjust the rotational positioning of the
shuttle race guide shaft or the left-right
positioning of the shuttle gib hook.
A
B
Hook/Driver Gap
Oscillating hook sewing machines have loose
tolerances between the Shuttle Gib Hook and
the Shuttle Driver. This play between the parts
is intentional and allows the Stitch Master
to sew heavier denier threads than many
larger rotary hook machines. The typical gap
between parts is 0.04" (
73
).
Gap
73
74
75
Stitch Master
®
Guidebook: Troubleshooting
62
61
