Adjusting Downfeed Speed - Grizzly G0643 Owner's Manual

Note: Make sure the design of the boring bit
to be installed matches the rotation direction
of the chuck as shown by the information
circle on the boring head above the chuck.
For example, in Figure 18, the left most
chuck will rotate to the right, as viewed from
above the chuck. This is shown by the letter
"R" in the information circle. The boring bit
will also be 320mm on center from the middle
or number "0" boring bit, as shown by the
number in the top of the information circle.
Information Circle
Figure 18. Boring chuck information circle on
boring head.
Boring bits are sharp and can cut your
hands. Protect yourself by using a shop rag
to handle the bits for removal or installa-
tion.
3.
Align the flat shank of the bit with the chuck
and insert the bit completely into the chuck.
Note: Generally, slight differences of drilling
depth from one bit to another is acceptable.
However, if the drilling depth across all boring
bits is required to be precise for your opera-
tion, see Aligning Boring Bit Height on
Page 30.
-18-
4.
Use a 2.5mm hex wrench to firmly tighten
two M5-.8 x 5 set screws into the chuck (see
Figure 19) and against the flat shank of the
boring bit.
Flat Shank
Figure 19. Boring bit installed.
5. Repeat Steps 3–4 for any other bits to be
installed.
6.
Replace the front boring head guard.
Adjusting Downfeed
Speed
The speed that the boring head lowers can be
adjusted by turning the downfeed speed adjust-
ment knob (see Figure 20). Experiment with dif-
ferent settings to determine the correct speed for
your operation.
Figure 20. Downfeed speed adjustment knob.
Model G0643 21-Bit Line Boring Machine
Chuck Set
Screws
Boring Bit