Knowledge Base / FAQ

To ensure that the magnetic core drilling machine stands securely, the electric or permanent magnet must be held securely.

For this, the workpiece surface must be even, clean and at least 12 mm thick. If the material surface is thin, uneven, dirty, painted or scaled, the magnetic holding force is significantly reduced. If the air gap between the material and the 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 around 66% and at 0.6 mm it is only 43%.

The KBM/KBU models 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. It is better to increase the material thickness by taking suitable measures.

The magnetic holding force display on FEIN magnetic core drills offers a decisive advantage for safety and precision when drilling. It shows the user in real time whether the magnetic base of the machine has sufficient grip on the workpiece surface. This is particularly important, as insufficient holding force can cause the machine to shift during the drilling process - with potentially serious consequences such as cutting edge breakage or the drill bit breaking off at the shank. The visual feedback from the display allows the operator to see immediately whether the machine is positioned correctly and is holding securely. This not only increases work safety, but also protects the tool and workpiece from damage. This function is particularly useful when working on painted, coated or slightly scaled surfaces, where the magnetic force may be impaired. In addition, the magnetic holding force display enables more efficient work, as there is no uncertainty when positioning the machine. The user does not have to rely on instinct, but can rely on a clear, objective display - a great advantage, especially when working overhead or in hard-to-reach areas.