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(3) Do not insert a foreign object into the body.
A foreign object inserted through a hole may cause failure. Please instruct customers to never insert a
foreign object into the main body of the tool.
(4) Avoid "Locking" of the motor.
Locking of the motor will generate an overload current that could result in motor burnout and/or rapid
battery deterioration. 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.)
(5) Variation in amount of work possible per charge
Although the nominal chargeable capacity of the storage battery used with the Model DB 3DL2 is 1.5 Ah,
the actual capacity may vary within 10% of that value depending on ambient temperature during use
and charging, and the number of times the batteries have been recharged. It should be noted that other
factors that may affect the amount of work possible per charge are the working conditions (e.g., ambient
temperature, type and moisture content of the workpiece, sharpness of the drill bit) and the operational
skill of the user.
(6) Precautions on the use of HSS drill bits
For example, although the Model DB 3DL2 is designed for drilling capacities of 5 mm (13/64") in mild
steel, this capability is not as efficient as conventional electric power tools. In particular, the drill tends to
become locked when the drill bit penetrates a material. For this reason, the customer should be
cautioned to reduce the thrust on the main body of the drill when drilling completely through a material
to avoid locking the tool. Repeated locking of the drill causes excessive current to flow from the
batteries, thereby not only reducing the amount of work possible per charge, but also possibly resulting
in motor burnout.
B. Suggestions and precautions on efficient use of the charger and storage battery
If the Type EBM 315 storage battery is exposed to direct sunlight for an extended period or the tool has just
been operated for a long time, charging may not be possible if the battery temperature is above 40°C
(104°F). In such case, the customer should be advised to place the battery in a shaded area with good
airflow, and allow sufficient cooling before recharging. This phenomenon is common to all existing batteries
and chargers that employ temperature-sensitive overcharge protection devices. The cooling time
necessary before recharging can vary from a few minutes to about 30 minutes, depending on the load,
duration of use, and ambient temperature.
