Grizzly G1021X2, Owner'S Manual

Page: 51 / 76

G1021X2 & G1021Z (Mfd. Since 08/16)
-49-
Adjusting table
Parallelism
Maximum Allowable tolerances:
Cutterhead/table Side-to-Side ..................0.002"
head Casting/table Front/Back ................ 0.020"
table parallelism is critical to the operation of the
machine. as such, it is essential that the table is
parallel with the cutterhead (within 0.002") from
side-to-side, as illustrated in
figure 65.
figure 66. Front-to-back parallelism of table and
cutterhead.
Table
Head
Parallel Parallel
Head
NOT Parallel NOT Parallel
FRONT-TO-BACK
(Side View)
Table
figure 65. Side-to-side parallelism of table and
cutterhead.
Cutterhead
Table
Parallel Parallel
SIDE-TO-SIDE
Table
NOT Parallel NOT Parallel
(Front View)
Cutterhead
how the table sits in relation to the head casting
from front-to-back is also important (see
figure
66). Because the feed rollers, pressure bar, and
chip breaker will be adjusted off the table position,
the tolerances on the front-to-back positioning are
not as critical as the cutterhead/table side-to-side
positioning. therefore, the maximum allowable
tolerance for the front-to-back parallelism is not
more than 0.020".
table Parallelism inspection
use your rotacator to inspect the table parallel-
ism. 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 table is
not within the maximum allowable tolerances, it
must be adjusted.
table Parallelism Adjustments
the table is adjusted by turning the chain sprock-
ets underneath the table for movements over
0.008" or by adjusting how the table is mounted
on the columns for movements under 0.008".
to adjust table 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 36).
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 table is adjusted equally.
5. Mark location of one tooth of sprocket that
you are adjusting.
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.