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Showing results for tags 'c-model 42008 pneumatic'.
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Hi guys, I'd like to share my version of a C-model of the 42008 Service Truck. I was inspired by the great TC5 contest, even though this doesn't qualify to it due to the part count. Nonetheless, only parts from the set 42008 are needed to build this model. This is actually my first actual MOC, I've only done mods and small concepts before. Still, this is already the 3rd tail lift implementation I post here :-) This time I'm using the small pneumatic cylinders, now attached to a small green delivery truck. Here are some pictures: It has the following features: - HOG steering - tail lift with controls for elevation and tilting it - manual pump behind the seats - openable doors - openable container space roof - openable upper part of the rear door Now some words about the tail lift. Here's the LXF model of it, and a picture: The cylinders are replaced in LXF by yellow 5M beams. The right hand side cylinder provides the lifting mechanism, and the left hand side cylinder tilts the lift (basically only closes or opens the lift when in the elevated position). Now, it's probably no surprise that the lift is very weak. It is raised only by the right hand cylinder, and the mini pneumatic cylinder isn't that powerful. Also the travel of the lift is much greater than the 2M travel of the cylinder itself, so it has to overcome quite a bit of mechanical disadvantage. Tilting the mechanism works fairly well, as there's not much force needed for closing or opening the back door; when using the door as a lift all the weight is carried by the completely retracted cylinder and not air pressure. (Which, of course is not completely realistic, but must be like this at this scale.) Despite being weak, I'm quite happy with the lift mechanism. It follows real design of these lifts quite closely. In optimal circumstances it can lift small loads, but typically it's not that useful. The reason is a bit unexpected: I discovered that a major force resisting lift travel was actually the pneumatic hoses that must also bend and move when the lift rises or lowers. There's not only the air pressure resisting bending of the hose but also friction when they rub against each other and the walls of the truck. Therefore I added a couple of rollers for each hose and also encapsulated them in the pin joiners that have much less friction when touching other parts. I didn't include a compressor, as I felt that manual pump would give slightly more pressure to the cylinders, and would be more appropiate for a model of this size. Also I'm not too fond of the vibrations the compressor creates. To operate the pump, you need to open the right side door and use the lever behind the seat (up/down). I haven't yet created an LDD version of this, but will get to that soon. After doing that, I'm looking into possibilities of using mini-LAs for the tail lift, as the model also has a pair of those. They are longer and take more space, but I'm sure they would work better. I don't know whether that means motorizing it or not, but we'll see. Thanks for reading, I hope you enjoyed this!