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MDS-250 series Drills |
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MDS -250 series drills are most popular drills used in underground mining operations in North and South America. The uniform high quality of materials and manufacturing process contribute to the long service life of the machines. The higher power-to –weight ration and compactness result high penetration rate. The drills are well balanced to provide easy operation to drillers. Parts are interchangeable with Jackleg Dill, Stopper Drill and Sinker Drill. |
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MDS 250JL – Jackleg Drill |
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Features
- High penetration rate
- High torque
- Convenient operating controls located at back head
- Push button Air leg retraction
- Positive lubrication and front-end-blow
- Sustained high penetration to the bottom of the hole
- Sufficient torque to install mechanical rock bolts
- Automatic Water Pressure regulation
- Parts interchangeable with Boart Longyear Secan-250 & Canun-260
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MDS-250 JL- JACK LEG DRILL |
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| Parameter Detail |
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Metric |
Imperial |
| Cylinder Bore |
79.4 mm |
3 1/8" |
| Cylinder Stroke |
73.25 mm |
2 7/8" |
| Air Consumption |
4.9 cu m/m @620kPa |
175 cfm @ 90psi |
| Blows per minute |
2250 |
2250 |
| Shank Size - Collared |
22mm x 108mm |
7/8" x 41/4" |
| Length -Drill |
559 mm |
22" |
| Length - Leg Retracted |
1550 mm |
61" |
| Length - Leg Extended |
2845 mm |
112" |
| Weight- Drill |
33 Kg |
73 lb |
| Weight- Leg |
13 Kg |
29.5 lb | |
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Metric Description
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MDS 250QD – Quarry Drill |
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Features
- Heavy duty chuck and chuck nut for deep hole drilling
- Direct air or water flushing
- Heavy duty air or water tube for effective hole cleaning
- Bolt on urethane muffler option
- Integral steel muffler
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| MDS-250 QD - QUARRY DRILL |
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| Parameter Detail |
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Metric |
Imperial |
| Cylinder Diameter |
79.4 m |
3.125" |
| Piston Stroke |
73.25 mm |
2.875" |
| Piston working stroke |
66.7 mm |
2.625" |
| Impact frequency |
2250 bpm |
2250 bpm |
| Drill Length - Sinker |
686 mm |
27 " |
| Weight of the drill - Sinker |
32 kg |
70.55 lbs |
| Drill Length - Quarry |
584 mm |
23 " |
| Weight of the drill - Quarry |
27.25 kg |
60 lbs |
| Air Consumption (90 psi) |
4.9 m3 |
170 cfm |
| Steel Size (Standard) |
22mm X 108 mm |
7/8" x 4 1/4" | |
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Metric Description
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MDS 250ST – Stopper leg Drill |
Download PDF
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Features
- High penetration rate
- High torque
- Convenient operating controls located at back head
- Push button Air leg retraction
- Positive lubrication and front-end-blow
- Sustained high penetration to the bottom of the hole
- Sufficient torque to install mechanical rock bolts
- Automatic Water Pressure regulation
- Air operated stainless steel water valve
- Parts interchangeable with Boart Longyear Secan-250 & Canun-260
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| MDS-250 ST - STOPPER LEG DRILL |
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| Parameter Detail |
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Metric |
Imperial |
| Cylinder Diameter |
79.4 m |
3.125" |
| Piston Stroke |
73.25 mm |
2.875" |
| Piston working stroke |
66.7 mm |
2.625" |
| Impact frequency |
2250 bpm |
2250 bpm |
| Drill Length |
1549 mm |
61" |
| Weight of the drill including airleg |
40.8 kg |
90 lbs |
| Airleg Bore diameter |
69.8 mm |
2.75 " |
| Air Consumption (90 psi) |
4.9 m3 |
170 cfm |
| Steel Size (Standard) |
22mm X 108 mm |
7/8" x 4 1/4" | |
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Metric Description
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MDS 250SD – Sinker Drill |
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Features
- Positive lubrication and front-end-blow
- Sustained high penetration to the bottom of the hole
- Automatic Water Pressure regulation
- Spring loaded handles for vibration dampening
- Air operated stainless steel water valve
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| MDS-250 SD - SINKER DRILL |
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| Parameter Detail |
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Metric |
Imperial |
| Cylinder Diameter |
79.4 m |
3.125" |
| Piston Stroke |
73.25 mm |
2.875" |
| Piston working stroke |
66.7 mm |
2.625" |
| Impact frequency |
2250 bpm |
2250 bpm |
| Drill Length |
686 mm |
27 " |
| Weight of the drill |
32 kg |
70.55 lbs |
| Air Consumption (90 psi) |
4.9 m3 |
170 cfm |
| Steel Size (Standard) |
22mm X 108 mm |
7/8" x 4 1/4" | |
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Metric Description
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