Bog's Paddleduck Engine

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sbwhart:
Coming together nicely Kirk :thumbup: its always good to get start to get things assembled things will really progress quickly know.

Great Job :clap: :clap: :clap: :clap: :clap:

Stew

kvom:
Only had a couple of hours or less today. Turned the conrods between centers. I couldn't taper the entire shaft but got reasonably close:

Here's the setup:

kvom:
My goal for today was to get the entire bottom end assembled and turning. I had to remake both of the smaller crankshaft pieces as they were slightly short and as a result some of the crankwebs were not gripping enough. Lots of disassembly, re-assembly, etc. I finally got it all together, oiled up, and locked in the mill vise. Then I used an electric drill to turn the crank. I ran that for about a minute at a couple of hundred RPMs. Now it's still a little stiff, but I can turn the entire assemblage by hand holding the flywheel.

I then turned my attention to the pistons and piston rods. Cut a length of 3/16 drill rod to size, turned on end down to .155 and threaded it 8-32, which is what I had previous tapped the pistons for. After some polishing on the lathe, I attempted to use the mill to lap one of the cylinders with the piston; all was well for a few seconds until the threads in the aluminum piston stripped out. :bang:

I decided at that point to remake both pistons from steel. :smart:

It's unclear from the plan how much the crosshead end of the rods should be threaded, so I need to do some measurements.

kvom:
Somewhat frustrating afternoon once again. I decided to remake the pistons in steel, and spent a fir amount of time turning them and polishing on the lathe to get a press fit. After parting off I attempted to tap one of them with my Kobalt 10-32 tap (since that will match the 3/16" piston rods), and the tap broke. :bang: Too late to switch to 10-24 as the hole in the other was already drilled too large. I also failed at cutting the 10-32 threads on a length of drill rod with a die (threads were slightly crooked). Next time I'll rough cut them with the lathe, and then finish with the die at the end.

Tomorrow is another day.

Bernd:
Kvom,

Keep the faith, some days ya' just can't get it right. :thumbup: I find doing something else for a while helps. :med: Then the next time you get back to the project it all falls into place.

BTW, I can't wait to see this engine run.

Bernd

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