The RMT 3/30 JLD Jackleg Drill is a pneumatic jackleg rock drill designed as per the legendary model Silver 303 of Holman. It is used for drilling work where portability, controlled feeding and dependable performance matter.
The RMT 3/30 Jackleg Drill is particularly suited for underground mining and tunnel applications where operators often work in confined areas and need a drill that can handle horizontal as well as inclined drilling.
The drill works with a pusher leg and can be used for holes in the 27–46 mm range, and capability of up to around 6 metres with suitable 22 mm drill steel. The water or air flushing feature also helps remove drilling cuttings from the hole.
For mines and tunnelling contractors, the attraction of a jackleg drill is its relatively straightforward operation. Instead of depending on a large drilling machine, the operator can position the drill and pusher leg according to the face and drilling direction.
The RMT 3/30 JLD is mainly suited for underground mining, metal mines and tunnelling.
It can be useful for horizontal and inclined drilling, development work and other drilling jobs where access is limited. The pusher leg provides feeding force while the pneumatic drill performs the actual rock breaking.
This makes the combination practical in areas where a larger mechanised drilling setup may not be convenient.
One of the main advantages of this model is the combination of drilling performance and relatively simple operation.
The RMT 3/30 Jackleg Drills weigh 23 kgs for the drill itself and 58 kg with the leg. It operates at 2,600 blows per minute, with a required air consumption of 57 l/s.
Another advantage is the option of air or water flushing. Proper flushing helps remove rock chips from the hole and can reduce the chance of the drill steel getting jammed.
The 22 × 108 mm shank size also makes it a practical choice for users already working with commonly used drill steels of this type.
Rama Mining Tools is one of the top pneumatic tools manufactured from India.
Buying a mining drill is not only about the machine. Spare parts, accessories and after-sales understanding are equally important when the tool is being used regularly. Thus, it is important that you select the best and the expert manufacturer.
Rama Mining Tools specialises in manufacturing pneumatic tools for construction and mining, along with its space parts and accessories. With experience of over 25 years, we have 150+ happy clients spread to over 50 countries
We provide a 6-month replacement warranty on any kind of manufacturing defect on the tools. With us, you get the complete supply of the drill, its spares and the drilling accessories like taper rods, IDS, lubricators, pneumatic hose pipes, etc.
With Rama Mining Tools, along with 3/30 JLD, you get the option to select from a wide range of high-performing pneumatic jackleg options like the BBC 16W of Atlas Copc, Boart Loangyear SECO 250 or RNP 250 drill.
If you are unsure whether the RMT 3/30 JLD is suitable for your drilling conditions, contact us to get the expert advice.
RMT 3/30 JLD is the same as the model designed by Holman Brothers, which was introduced in the market in the year 1930. The pneumatic drills of Holman Brothers dominated the British Commonwealth Mining Territories.
In May 2003, the Holman manufacturing factories were finally shut down. But the legacy of the Holman Brothers is still being carried by a few manufacturers from India and South Africa, and Rama Mining Tools is one of the companies among the few.
The RMT 3/30 Rock Drill variant comes in three versions –
a. Sinker Drill: - For vertical downward drilling
b. Jackleg Drill: - For horizontal or stope drilling
c. Stopper Drill: - For vertical upward drilling.
Contact us to get a quote on the legendary Holman Brothers Jackleg Drill model.
Technical Specification
| Model # | RMT 3/30 JLD | |
| Weight | 23 kg | 51 lb |
| Weight with leg | 58 kg | 128 lb |
| Length | 610 mm | 24" |
| Hole Dia | 32 mm | 1" |
| Drilling depth | 3 to 4 meters | 10 - 12 ft |
| Flushing with | Air or Water | |
| Air Inlet | 19 mm | ¾" BSP |
| Bore | 76 mm | 3" |
| Stroke | 51 mm | 2" |
| Estimated noise level | 125 db | |
| Vibration level | 33 m/s2 | |
| Air consumption | 57 l/s | 120 cfm |
| Water connection | ½" Hose | |
| Water consumption in Ltr/min | 20 ltr/minute at 2 - 3 bar pressure | |
| Rotation | CCW (Counter clock wise) | |
| Blows per min | 2600 | |
| Theoretical rotating speed | 260 rpm | |
| Shank size | 22 x 108 mm | ⅞" x 4¼" |
| Manufacturer | RMT | |