Figure 10-5.--Parallel ways (knife edge).
Figure 10-7.--Surface grinder (planer type).
sliding tables. This smooth, direct power is very
advantageous in grinding. The piping from this unit is
usually connected to power cylinders under the traverse
table. When the machine is operating automatically,
control valves divert pressurized hydraulic fluid to the
proper cylinder, causing the table to move in the desired
direction. Suitable bypass and control valves in the
hydraulic system let you stop the traverse table in any
position and regulate the speed of movement of the table
Figure 10-6.--Balance weights.
within limits. These valves provide a constant pressure
in the hydraulic system, allowing you to stop the feed
without securing the system.
CROSS TRAVERSE TABLE
The cross traverse table is mounted on ways that are
parallel to the spindle of the wheelhead unit. This allows
the entire width of the workpiece to be traversed under
common to all planer-type surface grinders. The basic
the grinding wheel.
components of this machine are a base, a cross traverse
A piston in a power cylinder is fastened to the cross
table, a sliding worktable, and a wheelhead. Various
traverse table to provide power feed. A handwheel
controls and handwheels control the movement of the
attached to a feed screw provides manual feed. The
machine during the grinding operation.
thickness (width) of the grinding wheel determines the
The base is a heavy casting that houses the
amount of cross traverse feed per stroke of the
wheelhead motor, the hydraulic power feed unit, and the
reciprocating sliding table. During roughing cuts, the
coolant system. Use the ways on top of the base to
work should traverse slightly less than the thickness of
mount the cross traverse table. Use the vertical ways on
the wheel each time it passes under the wheel. For finish
the back of the base to mount the wheelhead unit.
cuts, decrease the rate until you obtain the desired finish.
The hydraulic power unit includes a motor, a pump,
When you engage the power feed mechanism, the cross
and piping. These provide hydraulic pressure to the
traverse table feeds only at each end of the stroke of the
power feed mechanisms on the cross traverse and