Vertical and Horizontal drilling Twin American Pneumatic Drills, Gast Heavy Duty Air . Motor Chain feed Requires 400 CFM to operate MThe machines are used for horizontal and vertical line in a pattern, most quarries use them exlusively, simple, easy to line up cost effective ease of mobility. Drill the holes and then use dynamite to blast off a section of rock block 1-2" Drilling hole diameter Drill depth is 20' and can be extended via extension couplers Drill is air driven, needs 800 CFM Tooling can be purchased from Traxxon Rock Drills and Derusha Supply Machine was $65,000 back in 1996
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