Table parallelism, Notice, Table parallelism inspection – Woodstock SHOP FOX W1754 User Manual

Page 31: Table parallelism adjustments

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W1754 20" Planer With Mobile Base

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 25.

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 26). Because the

feed rollers, pressure bar, and chip breaker will be adjust-

ed 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

The easiest way to determine if your table has a parallel-

ism problem with the headstock is to lower the bed roll-

ers below the table surface, plane a workpiece, and mea-

sure the thickness in multiple locations. If the workpiece

is tapered from left-to-right or from front-to-back, then

parallelism 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 25. Side-to-side parallelism of

table and cutterhead.

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Figure 26. 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.