Bog's Paddleduck Engine

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kvom:
I finally got back in the shop this afternoon. The first order of business was to finish up and test something that a lot of people here have made: a diestock for the lathe:

The small part is 1" CRS drilled and reamed .5" and turned down to .65", which is the largest diameter the lathe chuck can clamp.

The larger part started as 1-3/8" aluminum round, bored 1" x .4" deep for the die, with the opposite end turned to .5" to fit the other part. Handles are 3/16" drillrod, and screws are 6-32 (I'll cut them down some later).

I also made a second try at silver soldering, and this time it seemed to go a lot better. Here's the joint after 1 hour or so in the pickle:

This time I used a very little flux and chamfered the hole manually with a countersink.

bogstandard:
Kirk,

Looks like you have both jobs cracked.

Nice two.

John

kvom:
Past few days in the shop have been dedicated to working on the Jeep, after breaking a control arm bolt on Saturday that also resulted in a busted shock absorber. :offtopic:

That said, this morning I took a little while off wrenching to silver solder the eccentric straps. This is the result after 2 hours of pickle soak:

I used 3/16" drill rod turned down to .150" on each end.

kvom:
Crawling under the Jeep replacing shocks left not much time for any engine building, esp. as I have a sore back as a reult. That said, I spent a couple of hours making some temporary air inlets, copied from shred:

I also had to re-do soldering one of the eccentric straps. Seems as if the solder did not go where it was supposed to.

Seems as if the only machining needed to be able to try out the engine under air is to fabricate the pins for the eccentric joint and thread the piston rods for connecting to the crosshead, and then I can try to put it together and do the "tuning". If I can get it to run then I'll need to make some feet and try to figure out if I'm going to make the bent copper lines like shred or make the straight flanges. I'd like to make gbritnell's tube bender, so I will investigate that option soon.

kvom:
I did make the pins for the eccentric joint, but I also screwed up my pistons. :hammer: I used my new die stock to thread the ends 10-24 only to "discover" that the crossheads are threaded 8-32. Not having any Al stock for remaking the piston & rod as a single piece, I decided to try to make them separately as now I have a chance to make straight threads on the rod. I threaded the 8-32 end on one and it looks pretty good.

Going offroading tomorrow, so no progress until Sunday at the earliest.

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