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Angle Drilling Dando Terrier

This small crawler mounted rotary rig is fitted with a mast dump for angle drilling up to 45 degrees from vertical in areas of difficult access and terrain.

The Angle Drilling Terrier’s ultra-small footprint and easy manoeuvrability means the rig is particularly suited to work in jungle and forest environments, causing very little disturbance to its surroundings. Supplied with Dando’s track mounted compressor unit, providing 400cfm at 170psi, one of our customers’ rig is being used for gold exploration in the deep jungles of the Congo using Rotary Air Blast drilling.

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Hydraulic Rotary Drilling Head Driven by a hydraulic motor fitted with a 7:1 ratio gearbox with manual gear change providing full controlled power and rotational speeds in forward or reverse. Integral side inlet water swivel with BW rod connection fitted to travelling carriage plate with bolts.
Maximum Torque (High Range): 155.6 ft-lb, 211Nm
Maximum Spindle Speed (High Range): 360 rpm
Maximum Torque (Low Range): 1089 ft-lb, 1477Nm
Maximum Spindle Speed (Low Range): 52 rpm (other options available)
Guide Ring: 170mm effective ID
Mast and Carriage Assembly A fabricated welded steel box section construction fitted with two wheels and two levelling jacks. Hydraulically raised and lowered by a single double-acting ram on the main Terrier undercarriage and attached via the pivot frame assembly.
Drilling Angle: 45-90 degrees
Dump Stroke: 400mm
Feed and Hoist System Provided by a single double-acting ram transmitting adjustable hydraulic load to the rotary head.
Stroke: 2.2m to accommodate 2m effective length drill rods
Stroke: 1.6m to accommodate 1m effective length drill rods
Feed Force: 500kgf
Controls and Hydraulic Power Hydraulic functions of the hoisVfeed and rotation are controlled from the main hydraulic control valve on the Terrier. Hydraulic power is supplied via PTO from the main Terrier hydraulic power pack.
Weight of Terrier Base: 754kg
Weight of Rotary Mast:
Long Mast 2.2 Stroke: 359kg
Short Mast 1.6 Stroke: 265kg
Drilling controls are located at the front of the rig allowing a good view of the drill string and safe operation of the rig when connecting up additional tooling. There is also an emergency stop located at the front and rear of the rig.
Compressor Unit Mounted on tracks
Provides 400cfm at 145psi.
Quick Connect Circuit A quick connect auxiliary circuit is fitted as standard to the Terrier hydraulic system. The circuit is protected by a separate pressure relief valve and has a variable flow control valve fitted to the control panel for fine control.
Jack Legs Set of stabilising jacks.
  • Chalwyn Valve and Spark Arrestor
  • Wireless Remote for Tracking
  • Casing Extractor
  • Lifting kit

Gold Exploration in the Jungles of the Congo

Angle Drilling in Spain

Angle Drilling Terrier and Track Mounted Compressor at Dando's Testing Facility

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