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2. Precautions Requiring Particular Attention During Sales Promotion
The cordless rotary hammer 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, in comparison with conventional AC type
impact drills and hammer drills, there are certain precautions which require particular attention.
Salespersons must be thoroughly familiar with the following points 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) Appropriate drilling capacity of the Model DH 14DL/DH 14DMR/DH 18DL/ DH 18DMR
The Models DH 14DL, DH 14DMR, DH 18DL and DH 18DMR are not capable of drilling several dozens
of holes like a conventional AC type impact or hammer drill because it is a cordless rotary hammer
powered by a battery. If the customer wishes to use the tool to drill many holes in succession, please
recommend that a spare battery should be kept available for use.
(2)
Use thrust within the range of 10 to 15 kg
Applying heavy thrust (pressure) on the tool, such as is possible with AC type impact and hammer drills,
will not accelerate the drilling speed. On the contrary, excessive pressure will reduce bit rotation and
hammering speed, and cause the storage battery to rapidly lose its charge.
(3) Variation in amount of work possible per charge
Although the nominal capacity of the storage batteries used with the Models DH 14DL/DH 8DL is 3.0 Ah
Models DH 14DMR/DH 18DMR is 2.0 Ah, the Actual capacity may vary within 10% of that value
depending on the ambient temperature during use and recharging, and the number of times the
batteries have been recharged. It should also 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 workpieces, sharpness of the drill bits, etc.) and the operational skill of the user.
(4) Precautions in drilling with metal drill bits.
Although the Models DH 14DL, DH 14DMR, DH 18DL and DH 18DMR are designed for a drilling
capacity of up to 13 mm in steel, its operational capabilities are considerably less than those of
conventional AC type impact drills. Especially when drilling with a 13 mm drill bit for steel, 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 pressure on the main body of the tool when drilling completely
through the material to avoid locking the drill.
