Kit List
EITHER 2-off Bosch 12 V motor with integral reduction gear
| Part number | 0 390 206 692 |
| Voltage | 12 V |
| Power | 4 W |
| Current | 1.7 A |
| Maximum current | 3.8 A |
| Speed | 65 rpm |
| Reduction | 33:1 |
| Continuous torque | 0.6 Nm |
| Breakaway | 2.2 Nm |
| Weight | 0.4 kg |
| Rotation | L/R |
Graph of torque (M) versus power (P), current (I) and speed (n)
OR 2-off Koganei pneumatic actuators
Part numbers PDA10X45-7 (barrel), PDA10-Y (clevis), PDA10-7C (fixing end)
| Actuator type | double acting |
| Bore (b) | 10 mm |
| Stroke | 45 mm |
| Shaft diameter | 4 mm |
| Operating pressure | (air) (P) 4 bar (60 psi) |
| Mass | 110 g |
| Distance between pivots | 140 mm (closed), 185 mm (extended) |
| Distance of fixture to first pivot | 30 mm |
| Pivot pin diameter | 3 mm |
Force acting on the piston F = ¼πb2P
Structural materials available
Steel angle and sheet as detailed below
Mild steel tube, 5/16 inch outside diameter x 21 swg (300 mm long)
Mild steel tube, 3/8 inch outside diameter x 22 swg (300 mm long)
Mild steel rod, 4 mm diameter (300 mm long)
HS steel rod, 4 mm square
Mild steel rod, 6 mm diameter (300 mm long)
Welding wire, 1.6 mm diameter (failure load in tension = approx 800 N)
Welding wire, 1.0 mm diameter (failure load in tension = 400 to 500 N, varying according to sample)
The welding wire can be used to model structural cables. It can be joined to other components by looping it through a hole or round an object and securing the joint with soft solder.
Miscellaneous supplies
12 V electricity supply, with leads
4 bar air supply, with pneumatic hose connectors and regulators
Rack ( 250 mm long) and pinion ( x mm diameter)
Nylon gears ( 12, 24, 36 teeth) and axles
Piano Hinges ( available in 2m lengths which can be cut to size. They are made of sheet metal, approx. 1mm thick. When closed they measure 15mm across. When open to 180 deg., measure 25mm across. They will over-open to about 270 deg)
String (only to be used, if at all, for raising/lowering the bridge)
Fasteners
M3/M4/M5/M6 nuts and washers
M4 x 10, 16, 20, 25, cheese head bolts
M5 x 16, 20, 25, cheese head bolts
M6 x 16, 25, 40, cheese head bolts
M3/M4/M6 studding
Pop rivets
