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(6) Precautions in the use of HSS Drill Bits
Although the Model DS 12DVB2 is designed for drilling capacities of 32 mm (1-1/4") in wood, and 13 mm
(1/2") in aluminum and mild steel, this capability is not as efficient as conventional electric power tools. In
particular, when drilling through aluminum material with a 13 mm (1/2") drill bit, the drill tends to become
locked when the drill bit penetrates through the material. For this reason, the customer should be cautioned to
reduce the thrust on the main body of the drill when drilling completely through the material to avoid locking
the tool. Repeated locking of the drill causes excessive current flow from the batteries which not only
decreases the amount of work possible per charge, but could also result in burning of the motor.
(7) Securely tighten the sleeve of the keyless chuck.
The keyless chuck may slip during operation if the shape of the drill bit shank is cylindrical depending on the
surface conditions, materials, etc. Please instruct the customers to retighten the keyless chuck more securely
if the keyless chuck slips during operation. The holding force of the keyless chuck is increased as the
tightening force of the keyless chuck is increased. The Model DS 12DVB2 is equipped with the locking device
to prevent loosening of the keyless chuck. The sleeve makes noise when tightening or loosening. This is
because of the locking device and there is no problem.
(8) Avoid continuous use.
Although the Model DS 12DVB2 can bear continuous operation under certain conditions, operating conditions
are different depending on material of workpiece and sharpness of the drill bit in use. Please instruct the
customers to avoid continuous use of the Model DS 12DVB2 and take a pause about 15 minutes after a single
charge operation as a guide.
B. Suggestions and precautions for the efficient use of the charger and storage batteries
If any of the storage batteries Types EB 1220BL and EB 1222HL is exposed to direct sunlight for an extended
period or if the temperature of the battery is high immediately after it has been used in the tool, the pilot lamp
(red) may not be turned on when the battery is connected to the charger. Chargeable temperature ranges of
each type of battery are specified as follows.
Type EB 1220BL: from -5
û
C to 60
û
C (from 23
û
F to 140
û
F)
Type EB 1222HL: from 0
û
C to 45
û
C (from 32
û
F to 113
û
F)
In such a case, the customer should be advised to place the battery in a shaded area with a good airflow, and
allow sufficient cooling before recharging. This phenomenon is common to all existing batteries that employ a
thermostat. The cooling time required before charging varies from a few minutes to about 30 minutes,
depending on the load, duration of use, and ambient temperature.