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我局探矿机械厂制造的第五批人造金刚石钻头（25号、27号、32号和33号），于一九七六年底先在第一地质大队三号机东方红油压转盘大小口径两用钻机试验。这台钻机也是探矿厂新研制出来的，钻机要试用高转数（超1000转/分），在8～10级花岗间长岩中，24号钻头进尺47.68米，26号钻头进尺62.60米，28号钻头进尺56.02米，29号钻头进尺44.83米，共进尺211.05米，平均钻头进尺52.76米。这四个钻头都在高转数产生高
The fifth batch of artificial diamond drill bits (No. 25, No. 27, No. 32 and No. 33) manufactured by the Bureau of Prospecting Machinery Factory were used in the first geophysical unit No. 3 of East First Oil hydraulic turntable at the end of 1976 Drill test. This rig is also newly developed by a prospecting plant. The drilling rig is going to try high revolutions (over 1000 rpm). In the granite interbeds of grades 8-10, the footage of drill 24 is 47.68 meters and the drilling of drill 26 is 62.60 meters , No. 28 bit footage 56.02 meters, No. 29 drill footage 44.83 meters, a total footage of 211.05 meters, the average drill footage 52.76 meters. All four bits are high at high rpm