ROCKWHEEL Selection - Transverse Cutting Unit Selection
Each unit has two cutting drums mounted on a transverse shaft driven either through a gear train, or directly, by a hydraulic motor powered and controlled from the excavator's auxiliary hydraulic circuit.
Advice is offered below to select the most appropriate transverse cutting unit for a specified duty, and illustrates their versatility using a number of interesting applications.
The starting point is an accurate assessment of the material, or materials, to be cut. This must include composition, abrasivity, strength and, in the case of rock, its bedding, dip, jointing, degree of fracturing, stability and local water regime.
Together with the scope of work, Webster Equipment Ltd can advise as to the most appropriate pick type, pick dressing, transverse cutting unit and excavator for the specified duty.
Cutting Drums:
- Each transverse cutting unit has a matched pair of cutting drums typically dressed in a double helix pattern commencing on the end face of each drum. This optimises pick spacing and positioning for cutting efficiency, durability and debris removal and gives the required clearances for trenching.
- Efficient cutting demands careful control of the excavator's digging motions to continuously advance the transverse cutting unit into the workface at the most advantageous orientation to optimise pick forces.
Picks are selected by their strength, profile and abrasive resistance:
- Carbide tipped point attack picks are used to cut strong and abrasive materials such as rock and concrete.
- Carbide tipped radial picks are better suited to weaker, more friable materials and tree stumps.
Experience and a detailed knowledge of the material, or materials, to be cut determines the required pick force, and hence transverse cutting unit model and the most appropriate excavator weight.
Cutting heads can also be supplied with water injection for dust suppression, or water jetting to assist cutting.
Transverse cutting units have established themselves as the ideal excavation attachment for cutting the hard materials encountered in the civil engineering and public works sectors. They have low operational noise and vibration transmission into the ground, improved excavation output when compared with other commonly accepted hard dig attachments, and can be controlled to cut an accurate profile.
The Current Range comprises of the following, however bespoke designs can be offered to suit customers requirements.
| Details |
TD-30 |
TD-40 |
TD-100 |
TD-140 |
| Maximum Input Power |
22 kW 29.5 hp |
29 kW 54.9 hp |
70 kW 93.8 hp |
110 kW 147.4 hp |
| Maximum Flow |
65 lpm 14.5 UK gpm |
112.5 lpm 24.8 UK gpm |
320 lpm 70.4 UK gpm |
460 lpm 101.2 UK gpm |
| Recommended Flow |
40 lpm 8.8 UK gpm |
60 lpm 13.2 UK gpm |
220 lpm 48.4 UK gpm |
320 lpm 70.4 UK gpm |
| Maximum Pressure |
400 bar 5801 psi |
400 bar 5801 psi |
400 bar 5801 psi |
450 bar 6526 psi |
| Output Shaft Torque |
1,875 Nm@ 300 bar 1,383 lbf ft @4,351psi |
3,570 Nm @ 300 bar 2,633 lbf ft |
14272 Nm @ 320 bar 10527 llf ft |
21,376 Nm @ 320 bar 15767 llf ft |
| Pick Force |
9.9 kN @ 300 bar 2,229 lbf@ 4,351psi |
17 kN @ 300 bar 3,822 lbf |
44.2 kN @ 320 bar 9937 lbf |
63.2 kN @ 320 bar 14,197 lbf |
| Output Shaft Speed |
100.0 rpm @ 40 lpm 100.0 rpm @ 8.8 UK gpm |
80 rpm @60 lpm 80.0 rpm @ 13.2 UK gpm |
78.0 rpm @220 lpm 78.0 rpm @ 48.4 UK gpm |
76.0 rpm @320 lpm 76.0 rpm @ 70.4 UK gpm |
| Pick Speed |
1.98 m/s @ 40lpm 460.5 ft/min @ 8.8 UK gpm |
1.8 m/s @ 60 lpm 418.5 ft/min @ 26.4 UK gpm |
2.2 m/s @ 220 lpm 511 ft/min @ 48.4 UK gpm |
2.7 m/s @ 320 lpm 536 ft/min @ 70.4 UK gpm |
| Unit Weight |
215 kg 474 lb |
381 kg 840 lb |
1056 kg 2308 lb |
1400 kg 3,059 lb |
| Excavator Weight |
2.5 - 6 tonne |
8 - 16 tonne |
15 - 25 tonne |
25 - 38 tonne |
| No. Of Picks |
56 |
56 |
64 |
60 |
