5699-E P-(v)
SAFETY PRECAUTIONS
6. Precautions against Fire
•Selecting Coolant
Use nonflammable coolant.
a. Never use oil coolant because it could catch fire from heated chips, tool’s frictional heat, or
grinding spark.
When using oil coolant for unavoidable reason, observe the following:
a. Check the tool edge condition, tool life, and set the cutting conditions that never cause fire
before you start machining.
b. Clean the coolant filter at regular intervals to maintain sufficient coolant discharge, and
always check the coolant for normal discharge.
c. Take every measures so that you can extinguish the fire immediately by placing a fire extin-
guisher near the machine and have an operator always watch the machining condition, or
installing an auto extinguisher.
d. Do not place any flammable objects near the machine.
e. Dispose of chips not to allow them to stack.
f. Periodically clean the inside and surrounding of the machine while checking that all the
devices are normally operating.
g. Never attempt untended operation.
h. When using oil coolant for grinding, you are requested to install fire-fighting equipment
such as auto extinguisher. In this case, inform us of your intention in the stage of examining
your facility.
•When machining flammable material
a. Before machining any of the flammable solid materials such as resin, rubber, or wood,
carefully study and understand the material characteristics and observe the above precau-
tions to take all possible measures to prevent fire.
b. Use particular care when machining magnesium, because its chips react to the water-solu-
ble coolant and generate hydrogen. The hydrogen may catch fire from burnt chips, result-
ing in explosive fire.
•Performing Dry Machining
a. Dry machining is a fire hazard because workpiece, tool, or chips are not cooled. Therefore,
never place any flammable objects near the machine and dispose of chips not to allow
them to stack.
b. Take the same safety measures as in the case of using oil coolant described above, such
as checking the tool edge state and tool life, and setting cutting conditions that never cause
fire.
•Emergency Measures in Door-close and Power-OFF State
a. Should fire break out in the machine when the door is closed and the power is OFF, open
the door using the door lock switch release key and extinguish the fire.
(For details, refer to “Safety door switch” in Section 3. Interlock.)
