(up to 3000 Kg winch pull)



Consallen Group Sales Ltd., P.O. Box 2993, Sudbury, Suffolk CO10 0ZB, UK. Tel: +44-(0)1787-247770; SMS (text) to: +447950-081065; e-mail:


A simple, and reliable low investment, light weight drilling technology for boreholes. Primarily used for unconsolidated materials, it will drill any material, including rocks, and is not troubled by boulders cobbles, or large gravel. Requires no mud, mud pits, mud pumps, tanks, drill rods, hammers or compressors, and needs only one vehicle.

Trailer-tripod Shell & Auger drilling differs slightly from other percussion drilling methods because a powerful winch enables tools with cut materilas to be pulled out that have been deliberately embedded, driven by heavy sinkers allowed to free-fall under gravity in the hole - see the video below. The rig can install and recover temporary steel casing. Several sizes of casing can be used in the same hole, as may be required by conditions.

It is a non-invasive and sensitive drilling method, allowing discovery, testing and water development, as progress is made. It is an appropriate method for water wells, for mineral prospecting, site investigation and remediation. This rig will drill to 125 metres (410 feet) with the standard winch drum - depending on the conditions and sequence of strata.

At only 450 Kg (1000 lbs), this light machine can be man-handled on its own wheels to places which would be inaccessible to heavier equipment. It is both helicopter and canoe portable.

Why Cable Percussion?  PDF on the advantages of this traditional, yet up-to-date and valuable drilling method.

VIDEO: showing setting up the rig and cable percussion drilling
This 11Mb .wmv file may take time to load.



Rugged high quality rigs made in England with very low inputs - quick two man set-up and operation; they cover the entire range of materials, with nothing extra to buy if the ground is harder than you thought. Machines are permanent, long life and maintanable.

Designed and built in the UK for use world-wide. At their heart is the highly successful Consallen design of clutchless freefall drilling winch, powered by either good quality direct drive high torque engines or by hydraulic power.

They are suitable equipment for drilling contractors drilling water wells, site investigations, window sampling, remediation wells, drainage holes, cleaning & bailing and environmental drilling. Can be used for setting drive points, hydraulic (jet) percussion drilling, peizometers & insitu testing, geothermal drilling, and prospecting.

PERFORMANCE of drilling rigs is a combination of the machinery, tools & equipment, materials to be drilled, proper planning, and operator skill. In suitable conditions the Forager-55/1250 can provide boreholes with 8-inch casing to 15 metres; with 6-inch casing to 60 metres and with 5-inch casing to 90 metres. Open hole drilling to 145 metres has been achieved below 90 metres of 5-inch casing. The fully braced tripod can lift 9,000 Kg.

MOVEMENT The Standard Forager-55 rig weighs about 500 KG and when folded, can be towed by a small car or pickup, and is easily towed off road in conditions which would be impossible with heavier machines. It is light enough to be man-handled to most locations, and the winch can be used to pull it into extreme places.


When driven HYDRAULICALLY, using our High-Low Power Pack the winch can have at least 2 speeds and hoist capacities, and provides both power up and power down, while retaining the free-fall facility. When the tools are light, high speed is available, but when pulling stuck tools or casing a slow speed at maximum pulling capacity is immediately available, providing a sustained bare drum tension of 3,000 Kg.

The safe mode of operation allows the driller to carefully control tools as they enter or are withdrawn from the drilled hole, or are presented for emptying, in a manner that is safe for both helper and driller; it also allows safe powered rig erection. The change-over between operating modes is immediate, and can take place at any time. Hydraulic drive allows the use of maximum available hoist - even while stalled - with no wear to the brakes. The safe mode even allows one-man operation of the rig and equipment.

Other equipment may be powered using a secondary hydraulic circuit, including casing jacks, casing rotator (solid stem auger driver and kelly drive & rotary table).
The picture changes OnMouseover

The picture shows a rig folder for towing, (total weight 500 Kg - 1100 lbs) with a demountable wheeled Power Pack. After erecting the rig, the unit can be rolled off the platform. Using the rig with the power unit at a distance provides the driller with a better working environment - it can always be positioned down-wind. This feature is demonstrated in the video clip below.

Here is a short VIDEO clip showing the hydraulic version at work:


The following is a list of drilling tools frequently used with rigs intended for drilling holes by normal cable percussion (shell & auger) method at about 6 inches (150mm) nominal diameter in unconsolidated soils - without casing. The list is suitable for drilling Basement Complex weathered overburden, glacial till & boulder clays, sand, gravel and cobbles. The same tools would be used if both 8-inch and 6-inch temporary casing were required:-
  1. Drilling wire in lengths to suit the depth envisaged - available to order up to 140 metres long. Supplied with swaged thimble eye one end and fused & tapered the other, of 10mm dia. non rotating crane wire - working load 1250 Kg.
  2. Attachment shackle - bow type - 3250 Kg. (7150 lbs) SWL.
  3. Sinker bars standard 100mm diameter weight 50 Kg each, threaded M/F with barring holes top & bottom. Normally 4 no. required & supplied. Also available in shorter half lengths, and by weight, to order. 50 Kg suits a two-man crew and satisfies EU Health & Safety requirements. SINKER BARS
  4. Threaded swivel bail for top sinker bar.
  5. Tool joint spanners
  6. 140mm dia. bailer with clack valve and threaded removable shoe - capacity 20 litres (Available to order up to 50 litres capacity) See details of the bailer via this link: BAILER
  7. 140mm dia. Clay cutter with threaded removable shoe and threaded top to suit sinkers. See page about the various uses of a clay cutter (the 'Auger' in shell & auger drilling) CLAY CUTTER
  8. Basket catcher system for clay cutter comprising plastic catcher basket and 2 no. steel support rings.
  9. Stubber tool threaded to suit sinkers.
  10. Spade reamer - approx 180mm dia. - threaded to suit sinkers. SPADE REAMER
  11. Cross bit 145mm dia. threaded to suit sinkers - with hard faced welding cutting edges. CROSS-BIT
  12. Sliding hammer - light type - for driving cutting tools where required.
  13. Pair of snatch blocks to pull stuck tools - top one fits to tripod apex - working capacity 2500 Kg.
  14. Wire puller - 2000 Kg capacity for use with above snatch blocks.
  15. Universal shoe & shackle tool - used to remove shoes from bailer & claycutter and to tighten shackle pins
  16. Modular drilling system without sinkers also available.
Other tools are available, including flush jointed temporary steel drilling casing and attendant handling, driving and recovery equipment. See details under the following link: CASING
In addition, a range of modular tooling can be supplied for installation of temporary casing one size smaller.

Consallen Group Sales Ltd., P.O. Box 2993, Sudbury, Suffolk CO10 0ZB, UK.
Tel: +44-(0)1787-247770; You may send an SMS (text) to: +447950-081067; e-mail: