Patent ID: 7004691

Claim:
A deep hole cutter comprising: a tool shank including a front connecting part at the front end thereof; the tool shank having a coolant supply passage formed longitudinally therein; the tool shank further having a first outer discharge groove formed longitudinally thereof, the first discharge groove V-shaped in radial section; and a cutting head including a rear connecting part at the rear end thereof for coaxial and detachable connection with the front connecting part of the tool shank; the cutting head having a coolant supply bore formed therein, the supply bore communicating with the supply passage when the cutting head is connected to the tool shank; the cutting head further having a second outer discharge groove V-shaped in radial section, the second discharge groove aligned linearly with the first discharge groove when the cutting head is connected to the tool shank; the cutting head further having a discharge port formed in the front end thereof substantially diametrically opposite the second discharge groove, the discharge port opening in the peripheral surface of the cutting head; the cutting head further having a bypass passage formed therein between the discharge port and the second discharge groove; the cutting head further having a plurality of cutting edges formed on the front end thereof, at least one of the cutting edges facing the second discharge groove, at least one other of the cutting edges facing the discharge port; the cutting head further having a first outlet port and a second outlet port both formed in the front end thereof and each positioned substantially diametrically opposite the other, the outlet ports communicating with the supply bore.