| 摘要 |
A displaceable cutting tool shank holder, in particular for a rotary boring head threadable on a main spindle of a machine tool, having one end with a substantially H-shaped cross section provided with parallel linear tracks cooperating with linear tracks on internal projections in a member connected to the rotary boring head to thereby define guideways in which bearing balls on roller are situated. The projections are arranged on an end portion or top portion of the rotary boring head. An opposite end of the tool shank holder has a recess wherein a cutting tool shank is lodged.
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