![]() ![]() Place a block on the central driver at 'bottom dead centre' - this is about 'six o'clock' on the wheel. Here is Henry (by Darren Kent), shorn of motion. I chose the left side for these pictures. To animate the valve gear - pick a side, and do that first. #Walschaerts valve gear animation how to#If you want to know how to do this - go see Richard Osborne's excellent tutorial. I assume that you have already animated the wheel and built all of the bits you need for the motion. In order to set this up in TSM, you need to go to the ‘project properties’ section. If you only want to use 8 frames, replace the number 16 with 8 in the rest of this spiel. I assume that you're working on a locomotive that is travelling along the z-axis.įor steam engines, I prefer to use 16-frame rotation, because it looks smoother, and is only twice as much work. I am using TSM v1.1, and I assume that you're familiar with that product. My terminology may be suspect, and I'm prepared to stand corrected. I am neither an engineer, nor a locomotive crewman. If they were offset by 180 degrees, the loco could stall, but that's another story. #Walschaerts valve gear animation drivers#To offset this, the piston rods are attached to the drivers at an offset of 45 or 90 degrees to each other. (I understand that this is called 'Hammer Blow' and is the bane of the Civil Engineer's life.) This is not the case - if both piston rods connected to the drivers at the same point, you would get a massive amount of force being applied to a single point on the wheel, which would be bad. This power is transferred to the central driving wheels via the piston rod, and to the other drivers by means of the coupling rod.Ī common error is the assumption that both sides of a steam engine are symmetrical. As this steam expands, it pushes the piston backwards. This breaks the vacuum, and causes live steam to be injected into the space ahead of the advancing piston. When it reaches a certain point in the stroke, an admission valve is opened. A vacuum is created in front of the piston head, which tends to pull the piston forwards, and this is assisted by steam applied from behind. Walschaert's valve gear does not provide power on a single stroke. I found this gear animation program a godsend - ttp://- get the Windows version. ![]() In order to animate correctly, I think you have to know how a steam engine works, and in this case, the Walschaert's gear. ![]()
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