Ryobi CTH1202K2 Manuel de service télécharger pdf (Page 12)

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(6) Precautions in the use of HSS Drill Bits

Although the Model FDS 12DVA is designed for drilling capacities of 21 mm (13/16") in wood, and 15 mm

(19/32") in aluminum, and 12 mm (15/32") in mild steel, this capability is not as efficient as conventional

electric power tools. In particular, when drilling through aluminum material with a 15 mm (19/32") 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.

B. Suggestions and precautions for the efficient use of the charger and storage batteries

If the Type FEB 12S Storage Batteries are 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 a battery (type FEB 12S) is

above 40 ˚C (104 ˚F). In such a case, the customer should be advised to place the battery in a shaded area with

a good airflow, and allows 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 30 minutes, depending on

the load, duration of use, and ambient temperature.

9. REFERENCE MATERIALS

9-1. Speed Control Mechanism

Spindle rotation speed of the Model FDS 12DVA can be

controlled by simply varying the amount by which the

trigger switch is depressed. The relationship between the

amount the trigger switch is depressed (in millimeters) and

the rotation speed is illustrated in Fig. 3.

Note: The gradient and values illustrated in Fig. 3 are

intended for reference only, and will vary slightly

due to differences in the discharge condition of the

battery, the ambient temperature, and individual

speed-control element accuracy.

100

Rotation speed

60 5

(%)

12 8

2.2 0.5

6.5 0.5

+0.5

Amount trigger switch is depressed (mm)

Fig. 3

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 22 23

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Ryobi CTH1202K2 Manuel de service Page 12