With the Fletcher Model DDR Walk-Thru, you get dual head, angle or vertical drilling in lower seams than ever. The Model DDR offers a maximum straight line boom swing of 5.4 m to accomodate a four-bolt pattern on 1.2 m centers. The masts tilt 45 degrees for truss installations, 90 degrees for tramming.
- 0.9 m chassis height, dual-head machine with angle drilling capability
- A truss and rib bolter than can also be used as a production bolter
- Walk-through chassis design eliminates the need for the operator to walk between the machine and the rib
Note
Joy is the exclusive distributor and authorized service provider for J.H. Fletcher & Co. products worldwide, with the following country exceptions:
Not a distributor or authorized service provider
- United States
- Canada
- Mexico
- Australia
- Norway
Non-exclusive distributor and authorized service provider
Electrical system
- Dual 37 kW motors
- Horizontal axis cable reel
- Lights
Dust collection
- Internal through drill steel
- Blower: 62 cfm rotary lobe type
- Vacuum at drillhead: 12"-15" Hg
- Fletcher dust tanks
Hydraulic system
- Maximum working pressure: 2800 psi
- Tank capacity: 470 liters
- Filtration: Four magnetic in-tank, two high pressure, hand-operated fill pmp iwth screened intake
- Hose fittings: JIC and SAE
- Dual Parker P350/315 Series pumps
Drive system
- Four-wheel chain drive
- Tractor-type steering
- Turns within length
- Tram sepeed: 0-2.4 km/h
- Staffa B80 serieswith motion control valves
- Brakes: Automatic spring set, hydraulic release disc
- Tires: 14.5 x 15 foam-filled
- Front lift
Safety system
- L type TRS
- Driller canopies
- Tram deck canopy
Drilling system
- Linear sumping booms
- Apollo telescoping mast feed
- Thrust:3.1 ton
- Feed length: 1.29 m to 2.05 m depending on mast size
- Torque: 0-400 Nm
- Drill rotation speeds: 0-560 rpm
- Feed rate: 0-11 m/min
- Boom extend up to .55m
- Minimum drillhead separation: 1.2 m
- Maximum drillhead separation:6 m
- Adjustable bolt torquing valve
- Foot-type boom stabilizers
| Maximum straight line swing |
5.5 m |
| Overall length |
7.7 m |
| Overall width |
3.2 m |
| Overall chassis height |
0.9 m |
| Wheelbase |
1.8 m |
| Machine mass |
19050 kg |
- Feedback drilling system
- Quick chagne motor mounts
- Titan drill mast (4.5 ton)
- Rock dusters
- Downhole drilling attachment
- Hydraulic drill guides
- Adjustable wear pad support posts
- Radio remote control tram
- Five-bolt pattern capability
- 3.3 m L-TRS assembly
- Power extend TRS beam
- Auto dump pre-cleaners
- Hydraulic power takeoff
- Rotary impact drillheads
- Headlights
- Crawler-mounted
- Articulating tRS beam
- Operator cooling fans
- Heavy-duty tram w/0.91 m tires