"The aluminum collection".
THE TWO CATERPILLAR D8K TRACTORS,
Scale: 1:15 th.
A personal challenge.
VSit is indeed able to build two models simultaneously. The parts are therefore all executed in duplicate, at least for the tractor.
Items like: blades and cabins are built separately.
We can draw from this experiment the following conclusion:
To make two models simultaneously, do not believe that in terms of duration, we divide the time spent into two equal parts.
It turns out that on two identical parts, the first is carried out in a longer time than the second.
This is normal since this first part is a "prototype". It is with this prototype part that design problems are studied and resolved. The second part then becomes a "copy", hence its reduced production time. We note that the first part is more advanced in its finish than the second.
During the whole construction, each one of the two models has a number.
The tractor n ° 1
and the tractor n ° 2.
The construction of these two models is made of aluminum glued with epoxy glue
for high stresses (reinforced by pegging) and cyanoacrylate glue
for low stresses ".
Production: from April 1996 to September 1998,
tractor n ° 1: 1000
hours.
tractor n ° 2: 700
hours.
The real machine ...
Dimensional measurements
(workshop of the Berthouly company in Montélimar 1996).
The model (under construction).
- The central frame.
Corner transmission on
final orders and
clutch system.
The channel track (right).
The central frame and the chain tracks.
The transmission
The kinematics:
She is made of :
- An electric motor reducer in 12 volts with the ratio: 64/1,
driving an angle pinion to the ratio: 1.6 / 1 via a shaft with two cardan joints.
- A clutch on both sides, for coupling
where the uncouplingof each of the channels.
- A final reduction to the ratio: 2/1 driving the gypsy.
Parts such as: cardan joints, dogs and all mechanical parts
which act on the clutch, are made from tubes or brass rods.
Functional organs.
12 V traction gear motor
and hydraulic distributor.
12 V traction gear motor
and hydraulic distributor ... in their place ...
Note:
On these two models, the mechanical parts which constitute the transmission are present and can be functional.But the option chosen for this model is to stay in a "static" register; it is a choice in relation to the finish aspect of this model.
Ditto for hydraulic power. This is again a choice in relation to the finishing aspect of the model.
The whole system can be operated hydraulically, but it is hardly desirable to see drops of oil staining the corked and polished aluminum sheet.These cylinders can be actuated by a pneumatic source external to the model.
Models and moldswho have been
usedfor moldingpieces.
Pewter casts.
Moul. tin.
Moul. tin.
Moul. tin.
Moul. tin.
Resin molding.
Models completed.
Tractor n ° 1 equipped with:
- a Caterpillar cabin with Rops protection frame
- an 8S blade tilting transversely.
Dimensions:
Overall length: 410 mmOverall width: 261 mm Hoverall author: 220 mm Pweight: 5.1 kg
Tractor n ° 2 equipped with:
- a polyester cabin on the real machine(in aluminum on the model).
- an adjustable 8A blade "..
Dimensions:
Overall length: 396 mmOverall width: 277 mmOverall height: 206 mmWeight: 4.6 kg
Qa few details.
Tractor n ° 1.
Tractor n ° 2.
Finally, commercial pieces:
- aluminum sheets 0.5 mm thick.
- the micro screws of M1 and M1,6.
- the electric 12-volt traction gear motor.
- all rods of different diameter.
- small diameter tubes.
- the pinion.
- the different glues: epoxy, cyanoacrylate, neoprene.