CHUCKING C-5
2
ADJUSTING THE PRESSURE
This section describes the procedure used for adjusting the chucking pressure and the tailstock
spindle thrust (tailstock spindle specification).
WARNING
1.
The allowable chucking pressure must be set to a value lower than
the cylinder pressure that generates the cylinder thrust allowable for
the chuck, or the allowable cylinder pressure, whichever is the lower.
If this restriction is not observed, the chuck and cylinder may be
damaged. If the damage occurs while the spindle is rotating, the
workpiece and chuck jaws will fly out, causing serious injuries or
damage to the machine.
For the allowable maximum pressure of the chuck or the cylinder,
refer to the instruction manuals prepared by the chuck and cylinder
manufacturers.
2.
If a thrust exceeding the allowable cylinder thrust is applied to the
chuck, the component parts or bolts of the chuck will be damaged,
causing loss of chuck gripping force. If this happens while the
spindle is rotating, the workpiece or chuck jaws will fly out, causing
serious injuries or damage to the machine.
For the allowable cylinder thrust, refer to the instruction manuals
prepared by the chuck and cylinder manufacturers.
3.
Take the height of the jaws mounted in the chuck into consideration
when determining the chucking pressure. If the height is greater
than the standard height, reduce the cylinder thrust. If you fail to
observe this warning, large forces will act on the jaw mounting bolts
and the master jaw, which could cause damage to the jaw or master
jaw. If trouble of this nature occurs while the spindle is rotating, the
workpiece or chuck jaws will fly out, causing serious injuries or
damage to the machine.
For the relationship between jaw height and allowable cylinder
thrust, refer to the instruction manuals prepared by the chuck and
cylinder manufacturers.
4.
Give full consideration to the type of chuck and cylinder used when
setting the chucking pressure. Even if the same hydraulic pressure
is applied to the chuck, the chuck gripping force will vary according
to the manufacturer and type of chuck and cylinder.
For details on the chuck gripping force, consult the chuck and
cylinder manufacturers.
If the chuck gripping force is different from that intended, the
workpiece could fly out when the spindle is started, causing serious
injuries or damage to the machine.
