--- 9 ---
Correct (Flush)
Test drive a screw, and if the
screw head is still protruding,
adjust by turning the Knob
counterclockwise.
If the screw head is too deep,
turn the Knob clockwise.
Protruded
Sunk
Fig. 10-3
In this unit, unlike other automatic screwdrivers, the bit keeps on turning after completely tightening the screw.
Therefore, the screw head may be damaged when the bit moves away from the screw. So visually observe
how the screw is tightened, in addition to adjusting the tightening depth with the Knob mentioned above.
7-2-2. Tightening Posi-Drive Screws
Advise your customers that to tighten Posi-Drive Screws, they should use only the optional Posi-Drive Screw Bit
specially designed for the WF 4V. As for the WF 4V, as the bit engages the screw while it's turning, the use of
conventional Posi-Drive Screw Bits, which are not designed for this type of service, may result in cracked or
rounded out screws as screw driving may proceed without complete engagement of the bit with the screw.
To prevent this, the Posi-Drive Screw Bit designed for use with the WF 4V is provided with a guide point at its tip
(Fig. 11). However, the service life may be comparatively shorter than that of conventional Phillips Bits because
the bit wings must be made comparatively smaller.
Guide point
Wings
Fig. 11
