Core drills are suooessfully converted to large diameter construction drills.However the bevel gears areoften worn out in field application. An analpsis is made on factors influendng the service life of bevel gearswith the improvenent measures proposed.
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王需贞,陈逸.采用岩心钻机改装成大口径工程钻机应注意的问题[J].钻探工程,1994,(5):23-25,28.Wang Xuzhen, Chen Yi. Considerations on Conversion of Core Drills to Construction Drills[J]. Drilling Engineering, 1994,(5):23-25,28.