Grizzly G0890 Owner's Manual page 48

Cutterhead Parallelism Inspection
Use your Rotacator to inspect the cutterhead par-
allelism. If you do not have a Rotacator, a wood
block and feeler gauges may be used, but extra
care must be taken to ensure accuracy. If the
cutterhead is not within the maximum allowable
tolerances, it must be adjusted.
Headstock Parallelism Adjustments
The headstock is adjusted by turning the chain
sprockets underneath the table for movements
over 0.008" or by adjusting how the headstock is
mounted on the columns for movements under
0.008".
NOTICE
When making adjustments, tighten fasten-
ers after each step to ensure the accuracy
of your tests. When adjusting the chain
sprockets, keep in mind that if the chain
becomes too loose, it will fall off of all the
sprockets, and returning it to its proper
location can be extremely difficult.
To adjust headstock parallelism:
1. DISCONNECT MACHINE FROM POWER!
2. Remove cabinet panel and locate chain on
underside of table.
3. Loosen idler sprocket (see Chain Tension
instructions on Page 34).
4. Move chain away from sprocket you want to
adjust so only that sprocket can be rotated
independent of chain.
Note: If the left side of the table is too high,
the left two sprockets will need to be adjust-
ed. Each tooth on the sprocket represents
.008" of vertical movement as the cogs are
turned. Make sure, as you turn the sprockets,
to keep an accurate tooth count to ensure
that the headstock is adjusted equally.
5.
Mark location of one tooth of sprocket that
you are adjusting.
-46-
6. Carefully rotate sprocket (clockwise to raise
headstock; counterclockwise to lower head-
stock) just enough to position next tooth
at marked location, then fit chain around
sprocket again.
7. Repeat Steps 4–6 with each sprocket that
needs to be adjusted until table-to-cutterhead
clearance is within 0.008" from one side to
the other.
8.
Make sure chain is properly fitted on sprock-
ets, then re-tighten idler sprocket and lock
bolts.
9.
If necessary, micro-adjust headstock position
by loosening cap screws shown in Figure 54
and raising or lowering headstock until it is
properly aligned with table.
Note: This process may require adjusting the
columns on both the left and right hand sides
until you find the correct combination.
Figure 54. Location of headstock micro-
adjustment screws (one side shown only).
G0890/G0891 (Mfd. Since 06/19)
Adjustment
Screws