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G1033 20" Planer -13-
Chain Drive
Adjust the chain drive by loosening the chain ten-
sioner and loosen the chain until you can turn
each corner sprocket independently. If the back
of the table is too high, the back two sprockets
will need to be rotated clockwise to lower the
table. Each tooth on the sprocket represents
.016" of vertical movement as the cogs are
turned. Make sure, as you turn the sprocket, to
keep an accurate tooth count to ensure that the
table is lowered equally on both the left and right
sides. Turn the sprockets in small increments
until the front clearance matches the back.
When the front-to-back clearance is within the
.016'' tolerance, tighten the idler sprocket on the
chain drive and tighten the lock bolts.
With the front-to-back adjustments made, we can
concentrate on the alignment between the table
and cutterhead. To check table-to-cutterhead
alignment:
1. Place Block ''A'' on the table under the left
end of the cutterhead. Raise the table until
the block touches the bottom of the cutter-
head. See Figure 9.
2. Slide the block across the table toward the
right side of the cutterhead.
3. If the block becomes too tightly wedged
between the table and the cutterhead, or if
there is a noticeable gap between the block
and the cutterhead, the table will need to be
adjusted.
4. If you find a substantial gap (larger than
.016''), follow the directions above for loos-
ening the chain drive and turn the two right
sprockets (independently of the chain) until
the gap is eliminated. Turn the sprockets
counterclockwise from the bottom to raise
the table.
5. If the table is too high at the right side,
rotate the sprockets in the opposite direc-
tion.
Figure 9. Using block to align cutterhead.
Figure 10. Micro-adjustment screws.
When you get the tolerance to within the .016''
range, micro-adjust by loosening the Allen head
cap screws and lifting the table upward or down-
ward until the table and cutterhead are in align-
ment. See Figure 10. This process may require
adjusting the columns on both the left and right
hand sides until you find the correct combination.
REMEMBER: When making adjustments, be
certain to tighten fasteners after each step to
ensure the accuracy of your tests. When adjust-
ing the chain drive, keep in mind that if the chain
becomes too loose, it will fall off of all the sprock-
ets. Returning it to its proper location can be frus-
trating.