How do I ensure a high magnetic holding force?
Question:
How do I ensure a high magnetic holding force?
Answer:
The prerequisite for a secure stand of the magnetic core drilling machine is a secure hold of the electric or permanent magnet.
For this, the workpiece surface must be even, clean and > 12 mm thick. Thin, uneven, dirty, painted or scaled material surfaces significantly reduce the magnetic holding force.
If the air gap between the material and magnet is 0.2 mm, the magnetic holding force is reduced to approx. 80%.
With an air gap of 0.4 mm, the holding force is reduced to 66%.
At 0.6 mm it is only 43%.
Many FEIN core drills are equipped with a magnetic holding force indicator.
This helps the user to position the machine carefully.
If the holding force indicator flashes, drilling must be carried out with reduced feed force and increased caution.