| 摘要 |
A grinding bit apparatus used in conjunction with a grinding machine. A water pump in the form of a cylindrically shaped member having a helical groove on the surface thereof is mounted on the drive shaft of the grinding machine, a lower end portion thereof being located in a water reservoir. A grinding bit is mounted to the drive shaft above the water pump and is passively connected with the water pump so as to rotate with the drive shaft. One or more washers are placed between the water pump and the grinding bit so as to selectively vary the location of the working surface of the grinding bit with respect to the work table. An annular collar openings is provided which depends from the work table to surround the water pump and any portion of the grinding bit below the work surface. In another aspect of the grinding bit apparatus, other diameter grinding bits may be passively mounted to the drive shaft above the water pump, including a small diameter grinding bit suitable for performing both grinding and drilling operations. A modified annular collar is provided which is elongated and has connected therewith an auxiliary work table at the height of the small diameter grinding bit, and has further connected therewith an inner annular flange so that the top end opening thereof is located suitably near the grinding bit. A pair of internal tabs attached to the inner annular flange serve to direct rising and rotating coolant water from the water pump to the working surface of the small diameter grinding wheel.
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