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Forstner bits

Mit dem Forstnerbohrer können Sie kleine und große Bohrlöcher, aber auch Sacklöcher präzise und splitterfrei bohren. Ob es sich dabei um Hart- oder Weichholz handelt, ist unerheblich.


Benannt wurde der Forstnerbohrer nach seinem Erfinder im 19. Jahrhundert: Benjamin Forstner. Forstnerbohrer eignen sich für viele unterschiedliche Anwendungen. Im Expertenwissen erfahren Sie, was Sie bei der Arbeit mit Forstnerbohrer berücksichtigen müssen, um perfekte Ergebnisse zu erzielen.

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Forstner bits

EXPERT KNOWLEDGE FORSTNER DRILLS

What do you do with a Forstner bit?

Typical uses can be found in furniture construction as well as in carpentry. As it is often used for pot hinges, it is also known as a pot drill. Blind holes for connecting with screws or wooden dowels, for example, are another common use.


Forstner bits are also often called knothole drills, as they are ideal for precisely drilling out knotholes. Drill out the disturbing knothole with the Forstner bit and fit a cross-grain dowel made from the same piece or a similarly grained piece into the drilled-out knothole - and the knothole is barely visible.

What should I bear in mind when working with the Forstner bit?

There are two things you should consider before positioning the Forstner bit:

  • Pre-drill for the Forstner bit so that the centre point is guided.
  • Always pay attention to the Speed when using the Forstner bit.

Pre-drilling

You should always pre-drill for the Forstner bit: The centre point is generally not a cutting point. Pre-drill a hole to the depth and with the radius of the centre point. This means that you do not have to press the blunt centre point into the workpiece with brute force - the centre point slides easily and precisely into the workpiece at the pre-drilled hole and is guided further in the same way.

Diameter

Diameter is specified for use with pot bands or blind holes. If you want to remove a knothole, you should stick as close as possible to the Diameter of the area to be removed. However, it is better to remove one millimetre too much than one millimetre too little. Don't forget that you still want to pre-drill in the centre for the centre point.


Forstner bits are available in many different sizes. Diameters between 10 and 50 mm are the most common. There are also special sizes up to 150 mm.

Speed

The correct Speed is important when drilling with the Forstner bit. As a general rule, it is operated at a lower Speed than a twist drill. The drill bit must not run hot. Not only would you risk scorch marks, but the sharpness of the main cutting edges would quickly deteriorate at high temperatures. Therefore, always start with a low Speed and only increase it slowly.


Speed can be slightly higher when working in softwood than in hardwood. For a Forstner bit with a diameter of 10 mm, assume 2,000 revolutions per minute for hardwood and 2,400 revolutions per minute for softwood.


The larger the diameter, the further down you need to adjust the Speed. For 20 mm diameters, the Speed should be 1,000 rpm (hardwood) and 1,800 rpm (softwood). For diameters of 40 mm and above, you should set the Speed to a maximum of 500 rpm (hardwood) and 1,000 rpm (softwood). Less is more.

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