# Adjusting the Speed

- Select the correct speed before starting work. The speed must be appropriate for both the drilling diameter and the material you intend to drill. When the speed is set incorrectly, the application tool can become damaged or get caught in the workpiece.

## Mechanical gear selection

- Only operate the gear selector switch (19) when the power tool is not in use.

You can preselect two speed ranges with the gear selector switch (19).

First gear:
Low speed range for working with large drilling diameters.

Second gear:
High speed range for working with small drilling diameters.

- Press the release button (18) and turn the gear selector switch (19) into the required position.
- If the gear selector switch is not able to be rotated in place, turn the application tool slightly and then change to the required position.

## Speed control

You can preselect the required speed using the speed preselection thumbwheel (2), even during operation.

The required speed depends on the application tool used and the material being machined. This will prevent the application tool from overheating when drilling and guarantee high drilling quality.

Speed preselection | Application tool
--- | ---
Gear I: 50−250 min-1 | Annular cutter (dia. 35−50 mm), screw tap
Gear II: 100−510 min-1 | Twist drill, annular cutter (dia. < 35 mm)