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The treppaner is designed for making holes ø 20- 120 mm in diameter.
A hole ø 8 mm is pre-drilled into the material. Trepanning is performed by small feed at rpm up to 500. When trepanning a through hole the operation is started from one side and subsequently continued from the opposite side. In the finishing phase the trepanner looses its guidance wherefor the hole must not be finished. The thin web (about 0,5 mm) has to be broken through. This product is supplied to the retail chain dealing with iron ware. |
The
process of trepanning is simple. The blade is adjusted as illustrated by
loosening and subsequent tightening a screw 1 with the attached spanner.
The screw 2 is loosened, radius is set-up either by trial or with a slide
gauge following the formula R = D/2 + 4 mm (D = diameter to be obtained).
The maximum diameter can be obtained by removing the arm from the hole and
inserting it into the same from the opposite side. The screw 2 is now
tightened.