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(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 12DM 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 12DM 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 12DM 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 1230HL 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˚C to 60˚C (from 23˚F to 140˚F)
Type EB 1230HL: from 0˚C to 45˚C (from 32˚F to 113˚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.