Oil-cooled (wet) screw compressors inject oil into the compressor chamber. The applied oil creates a seal between the rotors that improves volumetric efficiency, making these compressors suited to application. [pdf]
When drilling through rock, the right HDD tool is the difference between an easy (well, "easy for HDD) job and hours of wasted time. Here’s what you need to know about the types of rock bits on the market. [pdf]
To make a hammer drill, most manufacturers start with a drill driver and add a hammer mechanism behind the chuck. In most cases, it adds a small amount to the overall length and a few ounces to the overal. [pdf]
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