Cutting tool holder with internal coolant passage having a compressible member

A cutting tool holder (100), comprising:

• a holder body (102);
• an upper jaw (104) and a base jaw (106), defining an insert receiving pocket (108) therebetween, located forward of the holder body (102), the upper jaw (104) and the base jaw (106) being coupled with the holder body (102), the upper jaw (104) having a front end (116) and a rearward end (118);
• a resilience recess (110) located adjacent the rearward end (118) of the upper jaw (104), the resilience recess (110) being bounded by a resilience recess wall (112) extending transversely to the insert receiving pocket (108);
• a holder body coolant channel (114) having a holder body outlet (113) opening out to the resilience recess wall (112);
• an upper jaw coolant channel (120) having an upper jaw inlet (121) opening out to the resilience recess wall (112) and spaced apart from the holder body outlet (113), and an upper jaw outlet (123) opening out to the front end (116) of the upper jaw (104);
• and
• a tool coolant plug (126) having a plug made of an elastically compressible material peripheral surface (142) and a plug coolant channel (128) passing through the elastically compressible material of the tool coolant plug (126) and opening out to the plug peripheral surface (142) at a plug inlet (131) and a plug outlet (133);
• wherein the tool coolant plug (126) is located within the resilience recess (110), with the plug inlet (131) facing the holder body outlet (113), and the plug outlet (133) facing the upper jaw inlet (121), and
• when the upper jaw (104) resiliently deflects toward the base jaw (106), the resilience recess wall (112) compresses the tool coolant plug (126), and the plug coolant channel (128) forms a fluid path from the holder body coolant channel (114) to the upper jaw coolant channel (120).