Rotatable tool for chip removing machining as well as a loose top therefor

Abstract

A rotatable tool for chip removing machining, including a basic body having front and rear ends between which a first center axis (C) extends around which the basic body is rotatable, and a loose top having front and rear ends between which a second center axis (C) extends. The front end of the basic body includes a jaw which is delimited by two torque-transferring drivers and an intermediate bottom in which a part of the loose top is receivable, and a center hole that mouths in the bottom of the jaw and has a hole wall which extends axially inside the basic body and in which a threaded hole mouths for a screw to co-operate with a centering pin that protrudes axially rearward from the loose top, the centering pin being insertable into the center hole. The centering pin has a cross-sectional area that is less than a cross-sectional area of the center hole. The centering pin includes two diametrically opposed surfaces, a first one of the surfaces forming a contact surface that extends tangentially between two axially running boundary generatrices which are situated along an imaginary circumscribed circle (S), the center of which coincides with the center axis (C) of the loose top, and between which an arc angle (α) is less than°. The contact surface, via the boundary generatrices, transforms into a second one of the surfaces that is spaced-apart inwardly from the circumscribed circle (S).