1-1
Okuma America Corporation
SAFETYSAFETY
SAFETYSAFETY
SAFETY
Rev. 8-21-01
SAFETY PRECAUTIONS
Okuma machines are fully equipped with various safety devices to prevent operators and the
machine itself from accidents. However, operators are urged to operate the machine with safety
in mind. Strict observance of all safety guidelines indicated in the documentation provided with
the machine is essential. The following are some points to observe when working with any
machine tool.
CHECK THE FOLLOWING BEFORE TURNING ON POWER
1) Close the doors of the electric control cabinet and the operation panel.
2) Never place obstacles around the machine.
3) Turn on power to the machine in the following sequence:
Depress the Emergency stop button.
Turn on the Main power disconnect.
CONTROL ON button on the operation panel.
(POWER ON button on the control cabinet on machining centers.)
4) Once the control “boots up”, release E-stop and press the Control On button.
PRECAUTIONS TO OBSERVE WHEN USING A CHUCK
1) Before starting the spindle or cutting operations, close the front door.
2) Strictly observe the allowable spindle speed for the chuck installed. Never exceed the maxi-
mum allowable spindle speed.
3) When a chuck or fixture unique to the user’s applications is used, check the allowable
maximum spindle speed and run the spindle within the allowable range. Pay due attention to
workpiece gripping force and balance.
4) The maximum spindle speed can be limited by inputting the spindle speed with G50. To
ensure safety in operation, input this spindle speed limiting command in the program
(G50S****).
5) If the spindle is operated at a speed close to the allowable maximum speed:
Avoid imbalance in the workpiece clamped in the chuck.
Apply the maximum allowable pressure to grip the workpiece since increased centrifugal
force reduces the chuck’s gripping force.
The maximum allowable spindle speed and applicable pressure for the chuck are indicated
on the name plate attached to the front door as well as on the chuck body. The maximum
allowable speed and the applicable pressure ensure a chucking force larger than one-third the
original chuck gripping force with the standard soft-top jaw set in line with the chuck body’s
outer periphery.
6) When special jaws larger than standard soft-top jaws are used:
Lower the spindle speed because the chuck’s gripping force is reduced due to increased
centrifugal force and lowered efficiency.
If the jaw clamping nut (jaw nut) is outside the chuck’s outer periphery, only one clamping
bolt holds the jaws in place, causing very dangerous conditions. Jaw nuts must always be
located within the chuck body’s outer periphery.
Machine the jaws to the shape of the workpiece.
To Next Page
Loading...