Why is a centring pin necessary when core drilling with the magnetic core drilling machine?
Question:
Why is a centring pin necessary when core drilling with the magnetic core drilling machine?
Answer:
The centering pin performs three tasks.
1. Positioning: It enables precise alignment at the desired (centered) drilling point.
2. Cooling: It closes and opens the coolant channel on the core drill and ensures that coolant is fed downwards to the cutting teeth via a cooling channel.
3. Core ejection: The centering pin runs against a spring in the shank of the core drill.
This is compressed and pushes the centering pin downwards when the core drill breaks through the material. This ejects the drill core from the core drill.