Another Paddleducks build log

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shred:
FWIW, mine's plates are 3mm Ali (~1/8"), and works well, but I don't think much thinner would be a good idea.

bogstandard:
There you go Tim, straight from a man who has had the experience of doing it.

Bogs

spuddevans:
Thanks Shred, if I had some 3mm ali I would use that , but my ali is only 2.5mm and I dont want to risk it. I'll wait until I get some 2mm brass sheet.

--- Quote from: bogstandard on August 09, 2009, 11:47:10 PM ---There you go Tim, straight from a man who has had the experience of doing it.

--- End quote ---

That's what I love about this forum, there is always someone who has already done either the exact same thing or a similar thing who can share their experience with those like me who are still relatively new to machining, :nrocks: :mmr: :nrocks:

Thanks guys :thumbup: :thumbup:
Tim

spuddevans:
Well I got just a little more done this afternoon.

I marked up the main block for the steam ports, and realising that they are centrally aligned and are set in the same distance from the end I decided to use my very high-tech vice stop to make drilling a lot easier. ( hey, I'm really getting into this whole "using jigs and stops to make machining easier" thing! :headbang: ) 1st up was center drilling the 4 ports, then drilling through to the cylinder bores.

Then, not yet having in my grubby little hands the 2mm brass sheet needed for the mounting plates, I skipped on a couple of steps in the plans to make some of the little things. I made the 4 crosshead rods, well, when I say I made them I just cut some 4mm stainless rod to length and then drilled and tapped one end.

Then I marked up the piston+rod assembly for cutting to length, chucked up a piston with the rod facing out of the ER32 collet and parted off to size, then did the same to the other piston assembly. Then I single pointed a M3 thread on each piston rod and finished off the thread with a M3 die.

So here is a mockup of the crosshead rods in the crossheads, along with the threaded piston assemblies also mounted in the crossheads.

That's all for today, stay tuned for more of the same different.

Tim

CrewCab:
Nicely done Tim, I must say I'm impressed how you've mastered the "dark art of single point threading" :bow: ........... the threads on the small SS rods looks very professional :headbang: .............. before my self imposed exile from the workshop around last Christmas :bang: I was trying to get the hang using a bit of delrin, I must get back to that :dremel:

Thanks for the continued updates, nice to see your progress.

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