Composite milling cutter

A composite milling cutter, comprising:

• a rotatable adapter plate having a raised key portion with a peripheral side wall, the peripheral side wall having a plurality of curved abutment surfaces symmetrically located on an inscribed circle, ICAP, defined by the raised key portion, the raised key portion further comprising a plurality of lobes extending radially outward with respect to the inscribed circle, ICAP;
• and
• a cutter ring having an opening with a peripheral side wall for receiving the raised key portion of the adapter plate, the peripheral side wall having a plurality of curved abutment surfaces complimentary in shape to the curved abutment surfaces of the adapter plate and symmetrically located on an inscribed circle, ICCR, defined by the opening, the cutter ring further comprises a plurality of lobe-shaped openings extending radially outward with respect to an inscribed circle, ICCR,
• wherein a tolerance between the curved abutment surfaces of the peripheral side wall of the raised key portion and the curved abutment surfaces of the peripheral side wall of the opening minimizes run-out, and
• wherein a tolerance between the lobe abutment surfaces of the adapter plate and the lobe abutment surfaces of the cutter ring minimizes relative rotation of the adapter plate with respect to the cutter ring.

A composite milling cutter, comprising:

• a rotatable adapter plate having a raised key portion with a peripheral side wall, the peripheral side wall having a plurality of curved abutment surfaces symmetrically located on an inscribed circle, ICAP, defined by the raised key portion, the peripheral side wall further comprising a plurality of lobe abutment surfaces, the raised key portion further comprising a plurality of lobes extending radially outward with respect to the inscribed circle, ICAP;
• and
• a cutter ring having an opening with a peripheral side wall for receiving the raised key portion of the adapter plate, the peripheral side wall having a plurality of curved abutment surfaces complimentary in shape to the curved abutment surfaces of the adapter plate and symmetrically located on an inscribed circle, ICCR, defined by the opening, the peripheral side wall of the cutter ring further comprises a plurality of lobe abutment surfaces, the cutter ring further comprises a plurality of lobe-shaped openings extending radially outward with respect to an inscribed circle, ICCR,
• wherein a tolerance between the curved abutment surfaces of the peripheral side wall of the raised key portion and the curved abutment surfaces of the peripheral side wall of the opening minimizes run-out, and
• wherein a tolerance between the lobe abutment surfaces of the adapter plate and the lobe abutment surfaces of the cutter ring minimizes relative rotation of the adapter plate with respect to the cutter ring.