| 摘要 |
An automatic feed system 10 is provided for advancing a hydraulically powered work head into a workpiece being cut. A hydraulic fluid powered work head motor 40 drives a drill diamond cutting tool 46 or other cutting tool to cut the workpiece, such as concrete G. Hydraulic pressure in an inlet line 42 feeding hydraulic fluid to the work head motor 40 is monitored to detect when high torque and hence high wearing forces are experienced by the diamond cutting tool 46. A feed motor 30 or other advance is provided to feed the diamond cutting tool 46 into the workpiece. A valve 50 is provided which is pressure sensitive and controls the feed rate of the feed motor 30 in reponse to pressure in the inlet line 42 delivering hydraulic fluid to the work head motor 40. In this way, a feed rate of the bit 42 or other cutting tool into the workpiece is reduced when high stress conditions exist on the cutting surface of the drill diamond cutting tool 46 or other cutting tool.
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