-29-
W1747 20" Planer
SERVICE
Table Parallelism
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 22.
Maximum Allowable Tolerances:
Cutterhead to Table Side-to-Side ..................... 0.002"
Headstock to Table Front/Back ....................... 0.020"
How the table sits in relation to the headstock from
front-to-back is also important (see Figure 23). 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 paral-
lelism is not more than 0.020".
Table Parallelism Inspection
The easiest way to determine if your headstock has a
parallelism problem is to plane a workpiece and measure
the thickness in multiple locations. If the workpiece is
tapered from left-to-right or from front-to-back, then par-
allelism may be a problem.
Use your Rotacator to further 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 maxi-
mum allowable tolerances, it must be adjusted.
Table Parallelism Adjustments
The table is adjusted by turning the chain sprockets
underneath the table for movements over 0.016" or by
adjusting how the table is mounted on the columns for
movements under 0.016".
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Figure 22. Side-to-side parallelism of
table and cutterhead.
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Figure 23. Front-to-back parallelism.
NOTICE
When making adjustments, tighten fasteners 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. Returning it to its proper location
will be frustrating and time consuming.