Rothoblaas - Timber Construction Page 180
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ABOUT DRILL BITS CHOOSE THE RIGHT DRILL BIT 150 mm WS DRILL BIT Suitable for soft timbers (red spruce, pine, poplar, etc.). WS-BOHRMAX® is also effective on European hard timbers and boards of various materials (chipboard, MDF, OSB, etc.). Good results also in soft to medium hard plastics. HSS DRILL BITS Ideal for all soft timbers and numerous hard timbers, as well as MDF plates. HM DRILL BITS Excellent performance on all hard materials, such as European and exotic hard timbers, coated boards and hard plastics. Not suitable for soft timbers, except BOHRMAX 3.0-HM drill bit. 140 mm 130 mm 120 mm 110 mm 100 mm 90 mm 80 mm RECOMMENDED RPM: 70 mm Depending on the material of the tool and the diameter of the drill bit, it is necessary to adjust the drilling rpm using the adjacent table. 60 mm Example: 50 mm A LEWIS (WS) helical drill bit with a diameter of Ø18 mm must be used at a maximum of 1900 rpm. Exceeding the recommended rpm has a negative effect on the drilling quality and durability of the drill bit. Recommendations for vertical milling machines are indicated separately. 40 mm 30 mm WS drill bit 20 mm HSS drill bits 15 mm HM drill bits 10 mm 5 mm min .-1 4000 2000 6000 8000 10000 12000 d LEGEND TL TL total length EL effective length SL spiral length H cutter height D cutter diameter d shank diameter R cutter radius 180 | ABOUT DRILL BITS | DRILL BITS AND CUTTERS SL EL HR H D
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