Graphical Construction Glossary >> Tools. >> Power Tools >> Forstner Bits
Named after the inventor, these bits are capable of drilling very precise holes in timber without splintering or marking the face. They can drill into end grain or through timber veneers and laminate surfaces.
Because of the design these bit are not used in hand tools as they need a lot of downward force for them to cut well. Most often they are used in a drill press where they perform excellently. They come in many different sizes. Both of these appear to be about 35mm which is a popular size for these bits as it is used a lot for the fitting of European style cabinet hinges.
The cup hinge requires a hole of say 12mm deep in a maybe 16mm door panel. Not much room for error, going slightly too deep with the point of the bit could seriously mar the face of the door. These bits handle this job with ease as the point only goes in maybe 2mm deeper than the flat base of the hole.
Tree Bits. Also known as Step Bits. Both descriptions are spot on. I have always used the name tree bit. When these bits first came out IMHO they were the best thing since sliced bread. I have done a lot of steelwork and these bits are essential for on site work where we are bolting metal plate together. For example:-
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