Cutting unit, method of varying rake angle of cutting unit and method of assembling thereof

A cutting unit comprising:

• a holder comprising a supporting block including a cut out at one end in one face;
• and a plurality of through holes at predetermined places on the cut out;
• a head assembly connected to said block, conforming to shape of said cut out, said head assembly comprising an insert pocket to accommodate a cutting insert, and a through hole at its center for connecting with the holder;
• fastening means passing through the holes of the supporting block and head assembly;
• and
• a plurality of pins passing through the holes of the holder, wherein a position of said pins is varied to displace the head assembly to vary a rake angle of the cutting unit,
• wherein the supporting block comprises one or more threaded holes for guiding the pins and wherein axes of the pins meet at one point.

A cutting unit comprising:

• a holder comprising a supporting block including a cut out at one end in one face;
• and a plurality of through holes at predetermined places on the cut out;
• a head assembly connected to said block, conforming to a shape of said cut out, said head assembly comprising an insert pocket to accommodate a cutting insert, and a through hole at its center for connecting with the holder;
• fastening means passing through the holes of the supporting block and head assembly;
• and
• a plurality of pins passing through the holes of the holder, wherein a position of said pins is varied to displace the head assembly to vary a rake angle of the cutting unit,
• wherein the pins are threaded for predetermined length and have spherical face at an end contacting the head assembly and have hexagon slot at bottom to provide movement inside the threaded holes.

A cutting unit comprising:

• a holder comprising a supporting block including a cut out at one end in one face;
• and a plurality of through holes at predetermined places on the cut out;
• a head assembly connected to said block, conforming to a shape of said cut out, said head assembly comprising an insert pocket to accommodate a cutting insert, and a through hole at its center for connecting with the holder;
• fastening means passing through the holes of the supporting block and head assembly;
• and
• a plurality of pins passing through the holes of the holder, wherein a position of said pins is varied to displace the head assembly to vary a rake angle of the cutting unit,
• wherein the cut out is in shape of segment of a sphere.

A cutting unit comprising:

• a holder comprising a supporting block including a cut out at one end in one face;
• and a plurality of through holes at predetermined places on the cut out;
• a head assembly connected to said block, conforming to a shape of said cut out, said head assembly comprising an insert pocket to accommodate a cutting insert, and a through hole at its center for connecting with the holder;
• fastening means passing through the holes of the supporting block and head assembly;
• and
• a plurality of pins passing through the holes of the holder, wherein a position of said pins is varied to displace the head assembly to vary a rake angle of the cutting unit,
• wherein the hole in the head assembly is fitted with a pocket pin for filling a gap created on the head assembly by the hole and to support the cutting insert.

A method of varying a rake angle of a cutting unit, said cutting unit comprising a holder comprising a supporting block including a cut out at one end in one face;

• and a plurality of through holes at predetermined places on the cut out;
• a head assembly connected to said block, conforming to a shape of said cut out, said head assembly comprising an insert pocket to accommodate a cutting insert, a spherical bottom surface and a through hole at its center for connecting with the holder;
• fastening means passing through the holes of the supporting block and head assembly;
• and a plurality of pins passing through the holes of the holder, said method comprising steps of:
• varying a position of pins projecting into the threaded holes to a predetermined length;
• and
• clamping the fastening means to set a rake angle of the cutting unit,
• wherein the pins make point contact with the spherical bottom surface of the head assembly to vary the rake angle of the cutting unit.

A method of assembling a cutting unit comprising:

• mounting a cutting insert onto an insert pocket of a head assembly;
• mounting the head assembly onto a supporting block of a holder at one end in one face;
• connecting the head assembly to the supporting block using a fastening means passing through a hole of the supporting block;
• and
• passing a plurality of pins through holes of the holder,
• wherein a pocket pin is fitted into a hole of the head assembly by a predetermined process, and
• wherein the fastening means comprises a ball bolt comprising a threaded rod connected with a ball screw comprising a threaded ball head and a hexagonal protrusion.