Aligning Boring Bit Height - Grizzly G0643 Owner's Manual

aligning boring bit height

Aligning Boring Bit
Height
To ensure drilled holes are consistent in depth
along the length of the workpiece, the height of all
boring bits must be equal.
Note: The table must be parallel to the boring
head before aligning the boring bits. Refer to
Adjusting Table Parallel to Boring Head on
Page 29.
To align boring bit height:
1.
DISCONNECT THE BORING MACHINE
FROM POWER!
Boring bits are sharp and can cut your
hands. Protect yourself by using a shop rag
to handle the bits during removal or instal-
lation.
-30-
2.
Make sure that all boring bits are inserted
fully into the chuck.
Note: This can be done by loosening the two
set screws that hold the bit into the chuck,
and, while applying moderate upward pres-
sure on the bit, re-tightenting the set screws.
3.
Use a dial indicator or a planed piece of stock
to determine if all boring bits are the same
distance from the table.
4.
The height of a boring bit can be adjusted by
removing the bit from the chuck, turning the
center screw of the bit (see Figure 39), then
re-installing the bit into the chuck.
Figure 39. Boring bit height adjusting screw.
Note: Threading the adjusting screw into the
bit raises the working height of the boring
bit.
Model G0643 21-Bit Line Boring Machine
Adjusting Screw