Adjusting Hold-Down Height; Positioning The Workpiece - Grizzly G0643 Owner's Manual

Adjusting Hold-down
Height
The hold-downs must firmly hold the workpiece
during the boring operation, and are adjustable to
accommodate the thickness of your stock.
To adjust the height of the workpiece hold-
downs:
1.
DISCONNECT THE BORING MACHINE
FROM POWER!
2. Loosen the locking collar set screw so that
the collar moves freely on the hold-down
shaft (see Figure 23).
Locking
Collar
Hold-down
Figure 23. Workpiece hold-down (front boring
head guard removed for photo clarity).
3. Lift the hold-down up until the bottom is just
slightly higher than your workpiece when the
boring head assembly is in the upper posi-
tion, then re-tighten the locking collar set
screw to secure the setting.
NOTICE
Make sure the hold-downs exert enough
pressure to keep the workpiece in place
against the rotational force of the boring
bits. Otherwise, the workpiece may move
during the boring operation, resulting in a
drilling line that is out of alignment.
-20-
The workpiece is positioned along the longitudinal
and cross paths to align the boring bits with the
desired line of drilling.
To position the workpiece for drilling:
1.
2.
Set Screw
Figure 24. Distance of 4" of the longitudinal
fence from boring bit centers, as read on the
If both ends of the longitudinal fence are
not the same distance from the boring bit
centers, the drilled holes will not line up
correctly. Make sure that both ends of the
longitudinal fence are the same distance
from the boring bit centers before you tight-
en the locking levers.
Positioning the
Workpiece
Turn the power to the machine OFF by press-
ing the EMERGENCY STOP button in.
Unlock the longitudinal fence and move it
along the cross fences to reach the correct
distance from the boring bits along its entire
length, then use the locking levers to secure
it in place.
Note: The distance from the longitudinal
fence to the boring bit centers can be mea-
sured on the cross fence scale, as shown in
Figure 24.
cross fence scale.
NOTICE
Model G0643 21-Bit Line Boring Machine