| 摘要 |
A facing and boring head includes a supporting member in the form of a circular disc secured at its back to the spindle of a lathe or the like. A slide is displaceable radially at the front of the supporting member in a guide extending perpendicularly and symmetrically with respect to the axis of rotation and provides for securement of a tool holder thereto. A counterweight is displaceable in the opposite radial direction between the front of the supporting member and the slide. The mass of the counterweight corresponds to that of the slide, including the tool holder and tool. A gear causes an opposite and equal radial movement of the slide and counterweight, depending on a positioning element. A cylindrical housing surrounds the slide, the counterweight, their guides and the gear. The housing is flanged-mounted on the supporting member. The housing includes at its front adjacent to the tool holder, a cover with a plane end face and an elongated slot extending in the displacement direction of the slide for the passage of a portion of the slide. A cover plate is provided on such portion of the slide and covers the elongated slide completely and bears with a plane face against the end face of the cover. |
