Hand-drawn diagram by James Watt explaining his discovery of the "parallel motion" in a letter to his Sohn: "The idea originated in this manner. On finding double chains, or racks and sectors, very inconvenient for communicating the motion of the piston -rod to the angulat motion of the working-beam, I set to work to try if I could not contrieve some means of performing the same form motions turning upon centers, and after some time it occured to me that AB, CD, being two equal radii revolving on the centers B and C, and connected together by a rod AD, in moving through arches of certain length, the variations from straight line would be nearly equal and opposite, and that the point E would describe a line nearly straight, and that if for convenice the radius CD was only half of AB, by moving the point E nearer to D, the same would take place; and from this the construction, afterwards called the parallel motion was derived. "
Of course, instead of a rope, you can use any type of parallel movement mechanism.
https://en.wikipedia.org/wiki/Parallel_motion
And of course, it's getting higher and higher speed after ...
So this Wats is not bad anymore .. but this is one of the most important things in the world and it is the simplest solution and guaranteeing higher revolutions. Obviously the ideal is Skin-Lipkin, but also is most complicated .. But after some analysis, to which the arms attach to the connecting rod, ie which carries the main forces, the rest can not be a monstrous size ..
In any case, the use of a traditional crosshead certainly became archaic ... because with the use of any of these solutions, the side force was not relocated, and it was liquidated at all. ..
Also from my drawing you can see that it is very easy to cool with the water of the piston ..
This can be used to change the temperature of the tea and it would be tempting to completely give up the oil.
And this is a very important matter, which allows us this construction, so it seems to me that you can do this and try some teflon bearings and seals
https://en.wikipedia.org/wiki/Peaucelli ... in_linkage
Here is the animation of THE SKELETON-LIPKIN LINKAGE which is automatically downloaded
http://kmoddl.library.cornell.edu/tutorials/05/
Normal position engine crosshead Skin-Lipkin: rolleyes:
Andrew
