DREHSCHLAGBOHRER MIT VIERGÄNGIGEM BOHRWENDELSCHAFT
The drill has a convex coil bar (4) projecting from a concave grooving base (5) up to a minimum circumscribed circle radium (H) in a four-fold rotation-and mirror-symmetrical coil cross section, and forming a rear section (7) with respect to a bar width (S). The grooving base is designed in a concav...
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| Zusammenfassung: | The drill has a convex coil bar (4) projecting from a concave grooving base (5) up to a minimum circumscribed circle radium (H) in a four-fold rotation-and mirror-symmetrical coil cross section, and forming a rear section (7) with respect to a bar width (S). The grooving base is designed in a concave shape. An inner circle (8) is enrolled in the four-fold rotation-and mirror-symmetrical coil cross section. The inner circle is provided with an inner circle radius (I) from one-third to two-third of the minimum circumscribed circle radium. |
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