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| Bog's Paddleduck Engine |
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| sbwhart:
Hi Kvom Look forward to seeing your build, I'm planning on building one of those engines later in the year as a break for my loco build, (when I start on it again) Have fun Stew |
| kvom:
I might try to make the crossheads first to get the harder parts done first. The other parts that are new to me are the eccentrics and silver soldering. I made the eccentric on the beam engine in two pieces, but I should bite the bullet and get the 4-jaw chuck on the lathe. Not rocket science, but tedious to adjust. A question to make sure I understand the workings: The writeup on the crank webs states that the dimensions are critical. I believe that this is because the distance between the two holes determines the total displacement of the piston in the block and hence must match the location of the steam inlet/outlet holes. Is this correct? Assuming this, are the diameters of the two rods that comprise the crankshaft also critical? Or in other words, can the shaft and the journals use the same diameter rod? |
| Darren:
The diameters should make no difference to the throw as this is measured center to center of the rods.....within reason you should be able to make them whatever you like. Just bear in mind, bigger dia, bigger surface area, friction/load bearing surface area the two main criteria to be concerned with here. |
| kvom:
Thanks for the quick reply Darren. I was just reading through your thread, and hadn't realized you were now building to John's plans as well. Looking good! I now realize I will need a slitting saw and arbor for the mill to make the crank webs. Luckily Enco has a free shipping deal going on. |
| Darren:
In that case this may be of interest :thumbup: http://madmodder.net/index.php?topic=646.0 |
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