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The space available in the casing of a pneumatic rotary rock or coal drill
is necessarily limited and precludes the use of a reciprocating engine.
The power unit used instead is similar in design to the vane compressor.
The rotor runs at a very high speed, between 3,500 rpm and 4,000 rpm, and
this is reduced by gearing to give a drill spindle speed of about 650 rpm.
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