Importance

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Abstract

A rotary tool holder of the type including a stationary shell adapted to be reciprocally positioned within a bushing plate and a shaft mounted rotatably within the stationary shell. An annular space is provided between the shaft and the shell and the shell includes an enlarged diameter collar portion proximate one end of the shell and a reduced diameter pilot portion extending from the collar portion to the other end of the shell. The pilot portion is slidably received in the bushing plate and the collar portion receives a pressurized coolant fitting. Needle bearings are provided in the annular space between the shell and the shaft proximate the pilot portion and a pair of annular seals are provided in the annular space between the shell and the shaft proximate the collar portion. The annular seals are positioned on opposite sides of a radial passage formed through the collar portion and through the shaft for communication with a central axial bore in the shaft. Pressurized fluid is delivered through the collar portion and through the radial port in the shaft to the central axial bore in the shaft from when it is delivered to the cutting tool carried by the shaft for delivery through a central bore in the tool to the cutting face where it acts to cool the cutting face and break up and remove chips from the cutting face.

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First Claim