| 摘要 |
The present boring head is constructed for drilling or boring deep holes or bores of substantial axial length whereby so-called veering off from the longitudinal boring axis is to be prevented. For this purpose three cutting members are distributed about the circumference of a base in such a manner that the cutting members are located at 0 DEG , 95 DEG , and 190 DEG with a position tolerance of +/-5 DEG for each cutting member relative to a polar coordinate system. At least one guide rod is arranged at an angle of 55 DEG and another guide rod is located at an angle of 305 DEG . Each guide rod position may have a tolerance of +/-10 DEG in said polar coordinate system. |
