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2. Inherent drawbacks of cordless driver drills requiring particular
attention during sales promotion
The cordless driver drill offers many advantages; it can be used in places where no power source is
available, the absence of a cord allows easy use, etc. However, any cordless tool has certain inherent
drawbacks. Salespersons must be thoroughly familiar with these drawbacks in order to properly advise the
customer in the most efficient use of the tool.
A. Suggestions and precautions for the efficient use of the tool
(1) Use the cordless driver drill for comparatively light work.
Because they are battery driven, the output of the motor in cordless driver drills is rather low in
comparison with conventional electric power tools. Accordingly, they are not suitable for continuous
drilling of many holes in succession, or for drilling into particularly hard materials which creates a heavy
load. Salespersons should recommend conventional electric power tools for such heavy work.
(2) Do not insert a foreign object into body.
A foreign object inserted through a hole may cause a failure. Please instruct customers to never insert a
foreign object into body.
(3) Avoid "Locking" of the motor.
Locking of the motor will cause an overload current that could result in burning of the motor and/or rapid
deterioration of the battery. Salespersons should advise the customer to immediately release the switch
and stop operation if the motor becomes locked. (A jammed drill bit can be disengaged from the
workpiece material by setting the switch to reverse rotation, or by manually turning the main body of the
tool.)
(4) Variation in amount of work possible per charge
Although the nominal chargeable capacity of the storage battery used with the Model DB 10DL is 1.5 Ah,
the actual capacity may vary within 10% of that value depending on the ambient temperature during use
and charging, and the number of times the batteries have been recharged. It should be noted that other
factors which may have a bearing on the amount of work possible per charge are the working conditions
(ambient temperature, type and moisture content of the workpiece, sharpness of the drill bit, etc.) and
the operational skill of the user.
B. Suggestions and precautions for the efficient use of the charger and storage
battery
If the Type BCL 1015 storage battery is exposed to direct sunlight for an extended period or if the tool has
just been operated for a long time, charging may not be possible if the temperature of the battery is above
50°C (122°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 and chargers which employ temperature sensitive overcharge protection devices. The cooling
time required before recharging can be accomplished varies from a few minutes to about 40 minutes,
depending on the load, duration of use, and ambient temperature.
