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Another Paddleducks build log
spuddevans:
--- Quote from: bogstandard on August 30, 2009, 03:21:44 AM ---Tim,
For the low block, just shim it up with layers of bacofoil, it might only need one or two. But get it before you have done the Sunday roast in it, less crinkles.
If you start to try bringing the others down to match the low one, you just might make it even worse.
John
--- End quote ---
That's a good point, I'll try the tinfoil shims :thumbup:
I got a little more done today, I got some temporary ( unless I can't come up with a fancy blingy design ) columns. Nothing fancy here, just some plain stainless rod cut to length and then tapped m3 at each end.
Then I cut up a couple of pieces of 4mm stainless for the Little end pins and single pointed one end of each piece m3, then cut a small slot for a screwdriver in the other end.
Then I got excited again and assembled the top and bottom
It's looking more like an engine now :D :D
Next will be the con-rods and then on to the steam chests.
Tim
arnoldb:
--- Quote ---It's looking more like an engine now
--- End quote ---
Very true Tim :thumbup: - looking good!
:beer: Arnold
NickG:
Wow Tim, it's looking great. To be honest, I'd probably leave the columns too - but that's just boring old me! :lol:
chuck foster:
thanks for the film canister in the picture, it really shows just how small the engine is :bugeye:
the columns look fine just the way there are................but it's your engine build so the sky is the limit :thumbup: :clap: :ddb: :ddb:
chuck :wave:
spuddevans:
Thanks for the encouragement guys :thumbup: :thumbup:
Got a couple of hours in the workshop today, started on the con-rods. I decided to try a little something different and used some brass Hex rod. I then marked up for drilling the 2 holes. I set up and drilled the 1st hole in both con-rods before repositioning the y-axis using the dial to make sure the spacing would be exact.
While I was worrying about getting the holes precisely at the right distance I neglected to make sure the hole's were exactly on centre on the flat of the Hex :bang: But it should be ok, I cant notice it with my eyes closed :lol:
Here's a pic of the setup for drilling, I dont have a hex collet so this was the best way of holding the hex bar to drill perpendicular to the flat of the hex. I squared up the hex rod with a small square and then tightened the vice up.
I then made up a little filing button ( my first forray into the world of filing buttons :dremel: ) and then used it to round over one end of each con-rod.
After that I only had a few mins left before I was called to do "more important things", so I cut down some 19mm square brass bar for the 2 steam chests and milled them to length. Next time I'll be breaking out the little flycutter to bring them down to the final dimensions, and then the fun starts when I start boring it out.
Tim
EDIT
Since getting this engine to run I have found a number of places that can cause friction, one of which is my design of Con-rod would tend to catch on the crank-webs. But the fix was very simple. I just put a m4 threaded rod in the chuck and placed the crankshaft end of the conrod over it and tightened a nut to hold it on. Then I just shaved about 0.5mm off the side of the conrod to leave a little boss. Then flip the conrod over and do the same.
This really helped ease the friction and catching issues with the conrods.
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