Grizzly G0890, Руководство пользователя

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G0890/G0891 (Mfd. Since 06/19)
-45-
Idler
Sprocket
Lock Bolts
Tensioning Headstock
Height Chain
The headstock height chain transfers movement
from the elevation handwheel to the columns that
control headstock height. The chain drive can be
adjusted to remove slack if the chain stretches
over time or is loosened during headstock leveling
procedures.
Items Needed Qty
Hex Wrench 5mm .............................................. 1
Wrench or Socket 12mm ................................... 1
To adjust headstock height chain tension:
1. DISCONNECT MACHINE FROM POWER!
2. Remove motor access panel to access head-
stock height chain (see Figure 51).
3. Loosen the two chain tension lock bolts, then
push idler sprocket against chain with mod-
erate pressure to eliminate slack in chain.
While maintaining pressure on idler sprocket,
re-tighten lock bolts (see
Figure 51).
NOTICE
DO NOT let chain fall off sprockets. It can
be very difficult to return chain to its proper
location on sprockets without changing
table adjustments.
4. Clean and lubricate chain and sprockets (refer
to
Headstock Height Chain & Sprockets on
Page 34 for detailed instructions), then re-
install motor access panel.
Figure 51. Headstock height chain adjustment.
Adjusting Cutterhead
Parallelism
Maximum Allowable Tolerances:
Cutterhead/Table Side-to-Side ..................0.002"
Head Casting/Table Front/Back ................ 0.020"
Cutterhead parallelism is critical to the operation
of the machine. As such, it is essential that the
Cutterhead is parallel with the table (within 0.002")
from side-to-side, as illustrated in
Figure 52.
Figure 53. Front-to-back parallelism of table and
cutterhead.
Table
Head
Parallel Parallel
Head
NOT Parallel NOT Parallel
FRONT-TO-BACK
(Side View)
Table
Figure 52. 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
53). Because the feed rollers 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".