-48-
Model W1873/W1874 (For Machines Mfd. Since 10/20)
SE
RV
IC
E
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".
Cutterhead.Parallelism.Inspection
Use your Rotacator to inspect the cutterhead parallelism.
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 maxi-
mum 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".
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,.and.returning.it.to.its.proper.location.can.
be.extremely.difficult.
Items.Needed:.
Qty
Rotacator .........................................................1
Phillips Screwdriver #2 .........................................1
Wrench or Socket 14mm .......................................1
Hex Wrench 6mm ...............................................1
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
Table
Headstock
Headstock
Parallel
Parallel
Not-Parallel
Not-Parallel
FRONT
BACK
Figure.52..
Side-to-side parallelism of
table and cutterhead.
Cutterhead
Cutterhead
Table
Table
Parallel
Parallel
Not-Parallel
Not-Parallel
FRONT
VIEW
SIDE-TO-SIDE
