Modular rotary cutting tool

A rotary tool extending in an axial direction along an axis of rotation, comprising:

• a support, comprising:
• a pair of opposing support structures, each support structure having an inner peripheral surface defining a coupling pin receptacle, the inner peripheral surface divided into a front receiving part and a rear receiving part, the rear receiving part comprising a circumferential groove, the front receiving part including a clamping surface and the rear receiving part including a stop surface, the support defining an external diameter, D;
• and
• a cutting head capable of being received in the coupling pin receptacle of the support, the cutting head comprising:
• a front cutting part defining a cutting diameter, DC;
• a coupling pin having an outer peripheral surface, the coupling pin divided into a front pin part and a rear pin part, the front pin part comprising a circumferential groove, the rear pin part including a torque surface, and the front pin part including a clamping surface;
• and
• a stop surface for an axial pullout prevention effective in the axial direction,
• wherein the clamping surfaces of the support and the cutting head taper radially inward in a direction of the front cutting part.

A rotary tool extending in an axial direction along an axis of rotation, comprising:

• a support, comprising:
• a pair of opposing support structures, each support structure having an inner peripheral surface defining a coupling pin receptacle, the inner peripheral surface divided into a front receiving part and a rear receiving part, the rear receiving part comprising a circumferential groove, the front receiving part including clamping surfaces and the rear receiving part including stop surfaces, the support defining an external diameter, D;
• and
• a cutting head capable of being received in the coupling pin receptacle of the support, the cutting head comprising:
• a front cutting part defining a cutting diameter, DC;
• a coupling pin having an outer peripheral surface, the coupling pin divided into a front pin part and a rear pin part, the front pin part comprising a circumferential groove, the rear pin part including torque surfaces, and the front pin part including clamping surfaces;
• and
• stop surfaces for an axial pullout prevention effective in the axial direction,
• wherein the clamping surfaces of the support and the cutting head taper radially inward in a direction of the front cutting part at a non-zero, second angle of inclination, α2, is in a range between 2.5 degrees to 6.0 degrees with respect to the axis of rotation, and
• wherein a gap exists between the stop surfaces of the support and the cutting head, and wherein a distance of the gap is greater than zero to about 1 percent of the external diameter, D, of the support.