To position the ram, turn the ram positioning screw
adjustments provided, you can increase or decrease the
length of stroke of the ram. You also can position the
until the ram is placed properly with respect to the work
ram so the stroke is in the proper area in relation to the
Specific procedures for positioning the ram and setting
work.
the stroke are in the manufacturer's technical manual
You can adjust the CRANKPIN, which is mounted
for the specific machines you are using.
on the crank gear, from the center of the crank gear
outward. The sliding block fits over the crankpin and
CROSSRAIL ASSEMBLY.--The crossrail
has a freesliding fit in the rocker arm. If you center the
assembly includes the crossrail, the crossfeed screw, the
crankpin (and therefore the sliding block) on the axis of
table, and the table support bracket (foot). (See fig. 9-1.)
the crank gear, the rocker arm will not move when the
The crossrail slides on the vertical ways on the front of
crank gear turns. But, if you set the crankpin off center
the shaper column. The crossrail apron (to which the
by turning the stroke adjusting screw, any motion of the
worktable is secured) slides on horizontal ways on the
crank gear will cause the rocker arm to move. This
crossrail. The crossfeed screw engages in a mating nut,
motion is transferred to the ram through the ram linkage
which is secured to the back of the apron. You can turn
and starts the reciprocating motion of the ram. The
the screw either manually or by power to move the table
distance the crankpin is set off center determines the
horizontally.
length of stroke of the tool.
9-2