Setting The Depth Gage (Accessory); Fitting The Diamond Core Bit With An Alternative Type Of Chuck; Prcd Ground Fault Circuit Interrupter - Hilti DD 250 Manual De Usuario

6 Operation

6.1 Setting the depth gage (accessory)

1. Turn the hand wheel until the core bit is in contact with the base material.
2. Set the desired drilling depth by adjusting the distance of the depth gage from the carriage.
3. Lock the depth gage in position.
6.2 Fitting the diamond core bit (BL chuck)
DANGER
Risk of injury Fragments of the workpiece or of broken insert tools may be ejected and cause injury
beyond the immediate area of operation.
▶ Do not use damaged insert tools. Check the insert tools for chipping, cracks, or heavy wear each
time before use.
CAUTION
Risk of injury The tool becomes hot as a result of use. It may have sharp edges.
▶ Wear protective gloves when changing the tool.
Note
Diamond core bits must be replaced when the cutting performance and/or rate of drilling progress
drops significantly. This generally is the case when the diamond segments reach a height of less than
2 mm (1/16 in).
1. Lock the carriage on the rail with the carriage lock. Check to ensure that it is securely fastened.
2. Open the chuck by turning it in the direction of the "Open brackets" symbol.
3. From below, push the connection end of the diamond core bit into the chuck on the diamond core drilling
machine, making sure that the teeth engage.
4. Close the chuck by turning it in the direction of the "Closed brackets" symbol.
5. Check that the diamond core bit is seated securely in the chuck.

6.3 Fitting the diamond core bit with an alternative type of chuck

1. Lock the drive spindle with a suitable open-end wrench.
2. Tighten the core bit with a suitable open-end wrench.
6.4 Selecting the speed
Note
Press the switch only when the tool is stationary.
1. Select the switch setting according to the core bit diameter used.
2. When turning the switch, rotate the core bit by hand at the same time until the switch can be set in the
recommended position.

6.5 PRCD ground fault circuit interrupter

1. Plug the diamond core drilling machine's mains plug into an earthed/grounded power outlet.
2. Press the "I" or "RESET" button on the PRCD ground fault circuit interrupter.
◁ The indicator lights up.
3. Press the "0" or "TEST" button on the PRCD ground fault circuit interrupter.
◁ The indicator goes out.
WARNING
Risk of injury Risk of electric shock.
▶ If the indicator continues to light up, further operation of the diamond core drilling machine
is not permissible. Have your diamond core drilling machine repaired by Hilti Service.
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