ALFRA Optibohr 80X Manuel D'utilisation page 16

How to work with annular cutters
 Push ejector pin (center pin) through head of annular cutter.
 Core drills with Weldon shank are tightened with clamping screws (DIN 913) on both clamping surfaces.
 First place annular cutter with ejector pin on a marked centre or marking.
 Set the cutter and spot-drill, until the entire cut edge is formed as a circle.
 During the drilling process, the cutter should be cooled permanently. Optimal cooling is possible by internal
cooling with our coolant unit.
 During the drilling process, do not stop the motor. After the process, cutter draws back with running motor.
 Remove chips and core after each drilling.
Remove chips with Chip-Remover. Do not touch with bare hands. Danger of injury!
How to work with twist drills
 The drill chuck with Weldon shank is only to be used with twist drills up to a diameter of 13 mm.
 Insert drill chuck with adaptor in the drill spindle.
 Insert twist drill in drill chuck and tighten.
Cleaning
Pull plug prior to cleaning. Danger of injury by unintentional switching on.
 Clean the outside of the motor by means of dry compressed air.
 Check connecting lines on damages.
 Clean and grease sliding surfaces regularly.
 Carbon brushes should be replaced after appr. 250 hours running time.
 After the work is finished we recommend to store the metal core drilling machine in the transport case in a
lying position.
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