Patent ID: 8303220

Claim:
A device for axial delivery of a cryogen coolant through a machine spindle to a tool mounted in a tool holder that is mounted in the spindle, the device comprising: an insulated tube for receiving cryogen coolant from a source external to the spindle; an axial socket opening on the rotary axis of the spindle for receiving the insulated tube, the axial socket opening being at the end of the spindle that is opposite the tool holder; a socket liner mounted in the axial socket opening that surrounds the insulated tube; a large diameter insulated section comprising at least a portion of the insulated tube; a seal positioned in the axial socket opening for sealing between the axial socket opening and the large diameter insulated section of the insulated tube, whereby the large diameter insulated section of the insulated tube shields the seal from the cryogenic temperature of the cryogen coolant; and, an axial passage in the tool holder for receiving cryogen from the insulated tube.