Hitachi HTC-DS12DVB2-TC Инструкция по эксплуатации онлайн [13/29] 1361

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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 -5ûC to 60ûC (from 23ûF to 140ûF)

Type EB 1222HL: from 0ûC to 45ûC (from 32ûF to 113ûF)

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.