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10. Change of tools
How to work with core drills.
• Push ejector pin (center pin) through head of annular cutter.
• Cutters with Weldon shank must be fastened with two setscrews(DIN 913) on
both clamping surfaces
• Replace blunt or twisted ejector pins
• Check the coolant flow.
11. Operating tips
First, place annular cutter with ejector pin on a marked center or marking. Drilling with
ALFRA Rotabest cutters does not require much expenditure of force. 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.
Drillings up to 10 mm material thickness should be drilled in one operation. When
drilling with material thicknesses of 10 mm and up you should disrupt the drilling from
time to time and remove the chippings.
Never let the core drill grind without pressure on the material
During the drilling process, do not Stop the motor. After the process, cutter draw back
with running motor. You will achieve this by turning over the handle on the rattle.
Remove chips and core after each drilling. Remove chips with Chip-Remover – do
not touch with bare hands – DANGER OF INJURY!
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