Hydraulic Rock Drill Drillcom model RD22 Authorized distribuitors to all Americas Piedmont Rock Drills USA Sales: Ed Giuffre +1 540 537 4367 Inernational Sales: Francisco Azevedo +1 540 922 2854 • All our PRD rock drill attachments will now be offered with Drillcom RD series hydraulic drifters. • Piedmont Rock Drills also can custom build any type of drilling machine for your application. The benefits of the RD series rock drills, when comparing to conventional drills: • When idling ( Percussion on with the shank rod not in contact with the rock) stresses to tie bolts caused by piston dampening are eliminated with the internal structure of the percussion cartridge. • Percussion piston designed for the best possible energy transfer for rock breaking. • Low feed force means low rotation resistance. Longer life for your drill steels,striker bars, and drill bits. • Robust rotation gear structure. • Easy to maintain, Less special tools needed. • Reduced price on spare parts. Drilling results from the stone quarry in July 2010: • Brown granite in Finland - Vertical holes • Drilling tools: 10 ft /3.04 meters 7/8 hex with ballistic button bit. diameter size 32mm/ 1 1/4". • Drilling speed 5 ft 6 inches /1.7 meters per minute. • Percussion pressure 120 bar /1740 PSI. • Rotation pressure 30 bar /435 PSI. • Feed pressure 50 bar /725 PSI ( Corresponding the force of 3.2 kN)