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Step 8Even more gluing... and crankshafts
Cut another section of pipe. (needs to be from the SAME piece of pipe as the piece you used for casting) This piece should be three inches long, clean both inside edges like you did for casting, as well as clean the inside of the pipe VERY well. Center over the large hole you drilled, and epoxy.
Once the epoxy cures, wipe the inside of the pipe with an oiled paper towel. Test the piston. As a note, you'll need to twist the piston until it slides freely. This is because the inside of a copper pipe is EXTRUDED, this means you'll have small ridges that run the length of the pipe, they're smooth and do not inhibit travel. BUT, they need to be matched with your piston which was cast with those ridges. Just move the piston up and down while slowly twisting until it moves freely. Mark the pipe and piston (for ease of matching) and remove piston.
Finally, onto the crankshaft. This is a CRITICAL piece of your engine. It MUST be as straight as possible, and, cannot have cams that are too deep. Doing such will cause the engine to not run.
here's the dimensions you should use for how deep the crankshafts should be. The crankshafts for the piston needs to be .15-.20 inches deep. The displacer needs to be a little less then .25 inches deep. You'll probably not get it right the first time, so don't worry about that, I made two and the second one turned out much nicer then the first. (unfortunately I got pictures mainly of the first) As a note, they can be bent in a trapiziodial shape rather then being rectangles. Also, the two cams need to be 90 degrees out of phase from each other. (if one is sitting flat on the paper, the other should be standing straight up)
1- measure distances of where the two cams need to go (where the rods for the displacer and piston are)
2- mark them down on a sheet of paper for reference
3- Cut a piece of wire 8 inches long
4- make first bend (measure and everything) Use both plyers.
5- roll the wire and make sure it still matches AFTER the bending.
6- make second bend 90 degrees from the other along the length of the wire.
8- roll wire to make sure it's still flat after bending. Bend slightly until it's straight again.
Once the epoxy cures, wipe the inside of the pipe with an oiled paper towel. Test the piston. As a note, you'll need to twist the piston until it slides freely. This is because the inside of a copper pipe is EXTRUDED, this means you'll have small ridges that run the length of the pipe, they're smooth and do not inhibit travel. BUT, they need to be matched with your piston which was cast with those ridges. Just move the piston up and down while slowly twisting until it moves freely. Mark the pipe and piston (for ease of matching) and remove piston.
Finally, onto the crankshaft. This is a CRITICAL piece of your engine. It MUST be as straight as possible, and, cannot have cams that are too deep. Doing such will cause the engine to not run.
here's the dimensions you should use for how deep the crankshafts should be. The crankshafts for the piston needs to be .15-.20 inches deep. The displacer needs to be a little less then .25 inches deep. You'll probably not get it right the first time, so don't worry about that, I made two and the second one turned out much nicer then the first. (unfortunately I got pictures mainly of the first) As a note, they can be bent in a trapiziodial shape rather then being rectangles. Also, the two cams need to be 90 degrees out of phase from each other. (if one is sitting flat on the paper, the other should be standing straight up)
1- measure distances of where the two cams need to go (where the rods for the displacer and piston are)
2- mark them down on a sheet of paper for reference
3- Cut a piece of wire 8 inches long
4- make first bend (measure and everything) Use both plyers.
5- roll the wire and make sure it still matches AFTER the bending.
6- make second bend 90 degrees from the other along the length of the wire.
8- roll wire to make sure it's still flat after bending. Bend slightly until it's straight again.
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Dec 1, 2010. 6:06 PMmagiccowy
says:
how much is this in cm the calculator doesn't seem right
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