Reamer with front gash design

A reamer, comprising:

• a shank portion extending from a rear end;
• and
• a cutting portion extending from the shank portion to a front end, the cutting portion being devoid of flutes and including a plurality of cutting teeth separated by a plurality of gashes, each cutting tooth having a cutting edge extending in a longitudinal direction from the front end to proximate the shank portion, the cutting portion including a margin trailing each cutting edge and extending along each cutting edge to proximate the shank portion, each cutting tooth also having a primary relief formed between the cutting edge and the front end and a secondary relief extending longitudinally between the margin of one cutting tooth to the cutting edge of an adjacent cutting tooth;
• a coolant bore that extends through the shank portion;
• and
• a plurality of coolant outlet ports that are in fluid communication with the coolant bore,
• wherein a coolant outlet port of the plurality of coolant outlet ports is located on the secondary relief of each cutting tooth and positioned rearward of a corresponding gash of the plurality of gashes such that fluid exiting the coolant outlet port is directed into the gash to prevent chips generated during a reaming operation from flowing in the rearward direction,
• wherein each gash extends a length, L, in the longitudinal direction from the front end of the reamer, and wherein the length, L, is in the range between about 0.05×D and about 1.0×D, where D is a cutting diameter of the reamer,
• wherein a distance, d, between the secondary relief of each tooth and the cutting diameter, D, of the reamer is smaller than the size of the chips generated during a reaming operation, thereby minimizing or preventing the chips from moving rearwardly of each gash,
• wherein each gash is defined by a leading side wall of one cutting tooth of the plurality of cutting teeth, a trailing side wall of an adjacent cutting tooth of the plurality of cutting teeth, and a radiused surface that is disposed between the leading side wall and the trailing side wall;
• and
• wherein the leading side wall is substantially parallel to a central, longitudinal axis of the reamer.

A reamer, comprising:

• a shank portion extending from a rear end;
• and
• a cutting portion extending from the shank portion to a front end, the cutting portion being devoid of flutes and including a plurality of cutting teeth separated by gashes, each cutting tooth having a cutting edge extending in a longitudinal direction from the front end to proximate the shank portion, the cutting portion including a margin trailing each cutting edge and extending along each cutting edge to proximate the shank portion, each cutting tooth also has a primary relief formed between the cutting edge and the front end, and a secondary relief extending longitudinally between the margin of one cutting tooth to the cutting edge of an adjacent cutting tooth;
• a coolant bore that extends through the shank portion;
• and
• a plurality of coolant outlet ports that are in fluid communication with the coolant bore,
• wherein a coolant outlet port of the plurality of coolant outlet ports is located on the secondary relief of each cutting tooth and positioned rearward of a corresponding gash of the plurality of gashes such that fluid exiting the coolant outlet port is directed into the gash to prevent chips generated during a reaming operation from flowing in the rearward direction.