ALFRA ROTABEST RB 50 SP Manual De Instrucciones página 19

Surface quality
If a kind of "air gap" is produced between the magnet and the work piece, this reduces the holding force. In the
same way, paint, rust, scale, surface coatings, grease or similar substances all form a gap, or an air gap, between
the work piece and the switchable magnet, reducing the holding force.
Temperature
The high-power permanent magnets installed in the magnet irreversibly lose their magnetic properties from a
temperature of more than 80°C, so that the full holding force is never reached again even after the magnets have
cooled down.
Maintenance and inspection of the magnetic core drilling machine
The user is obliged to maintain and service the core drilling machine in compliance with the specifications in the
operating manual and according to the country-specific standards and regulations.
The maintenance intervals are classified according to the frequency with which the maintenance should be carried
out.
Always disconnect the machine from the mains before any maintenance operations, otherwise
there is a risk of injury due to unintentional machine switch-on.
Before every use...

inspect the core drilling machine and underside of the magnet for visible signs of damage

clean the surface of the work piece and the underside of the magnet

check the blocking function of the safety tab on the lever

check the correct, firm fit of the core drill

check connection cables for damage
Weekly...

check that the operating lever and safety tab are working properly

use dry compressed air to blow the motor compartment out from the outside

check the underside of the magnet for scratches, pressure points or cracks and have the magnet repaired
by the manufacturer if necessary

in particular, consider the motor LED and change the carbon brushes if necessary
Monthly...

check the markings and labelling on the core drilling machine for legibility and damage and replace if
necessary

clean all the sliding surfaces regularly, re-lubricate them and set the pre-tension of the slide
Once a year...

replace the gear oil or gear grease.
Maintenance, testing and repair work may only be carried out by qualified electricians according to the regulations
valid in the respective country.
Only use genuine ALFRA spare parts.
An overview of spare parts can be found at the end of this
operating manual.
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