The down-the-hole drilling rig is an impact rotary drilling rig. Its internal structure is different from that of a general rock drilling machine. Its gad distribution and piston reciprocating mechanism.
[pdf] The price range for a basic borehole drilling machine can vary significantly. On average, you can expect to pay anywhere from $3,000 to $30,000 for a basic machine. This price range includes both handheld and mounted machines, with the latter being more expensive.
[pdf] But here is the silver lining: cheap, affordable geotechnical drilling rigs are plentiful and price with performance. In this buyer's guide, you will learn important considerations in choosing the best geotechnical rigs for small contractors and cost-effective soil testing strategies.
[pdf] 
