The Montabert HC-50 drifter is ideal for small headings and is designed mainly for bolting and face drilling. The HC-50 features a 45 to 76 mm (1 3/4 to 3 in.) hole range with an impact rate of 3750 BPM. The HC-50 is standard on all our Joy hydraulic jumbo drills.

Montabert drifters are well-known in the industry for the following:

• Longest maintenance intervals
• Lowest maintenance costs 
• Lowest consumable cost
• Faster drilling speeds
• Highest penetration rates
• Lowest noise level and vibrations
• Easiest to operate

Our Montabert drifters leverage our deep knowledge of shock wave transmission and percussion mechanism theory to incorporate innovative technologies, such as progressive blow energy and hydraulic dampening.

Progressive blow energy

The unique design of the HC-50 piston generates a perfect, long shock wave in a trapezoidal shape, which provides:

• Better transmission of energy at the couplings
• Minimum stress into the drilling rods
• Better bit penetration

Hydraulic dampening systems

The dampening piston not only absorbs any lost reflected energy, but also creates a constant thrust onto the tools. This ensures:

• Optimum shock wave transmission
• Drifter and tools protection
• Reduced vibrations

Energy recovery valve

The energy recovery valve uses piston rebound energy for the next blow, providing:

• Better efficiency
• No internal peak of pressure source at cavitation
• Best drifter protection