Single Cylinder – Twin Piston (de Waal design)

[Bruce EdneyParticipant @bruceedney59949]

Got started on my next project – Made a complete hash of the 1st attempt of a part (see thread in Beginner section "Reading a drawing – Radius" ) so tonight sat down and did some careful marking out on plastic first. Looking forward to the challenge

Drawings sourced from here

Marking out

Edited By Bruce Edney on 22/04/2015 09:56:42

Edited By Bruce Edney on 22/04/2015 09:57:07

[Bruce EdneyParticipant @bruceedney59949]

An Engine designed by J. de Waal – built by me

[Michael GilliganParticipant @michaelgilligan61133]

Looks fascinating, Bruce

Good luck with the build

… Lots of progress-pictures please !

MichaelG.

[Bruce EdneyParticipant @bruceedney59949]

Evening 2 – the cutting out begins – Thanks JasonB for the tip about pinning the 2 pieces together. Will do some filing tomorrow.

[Mike PooleParticipant @mikepoole82104]

I think you may not have allowed for the material to make the bent feet that the frame is attached to the cylinder with, check the side view and top view for design and dimensions.

Mike

[Bruce EdneyParticipant @bruceedney59949]

Thanks Mike

I decided to go with Jason's suggestion of placing a piece of square bar between the sides.

[Mike PooleParticipant @mikepoole82104]

Phew, thats a relief that you haven't cut off a bit you were going to need, putting on is allways harder than taking off I find. Glad it's all under control and all the best with the project.

Mike

[Bruce EdneyParticipant @bruceedney59949]

Hi everyone

Here is my progress for today

[Bruce EdneyParticipant @bruceedney59949]

After a morning of cleaning the garage (aka workshop) up and adding some extra lights, I finally got onto cutting some metal.

Crankshaft webs finished off and then the crankshaft pieces and pin made. Finished off with the top of the con rod.

I am quite pleased with progress.

Thanks for looking.

Bruce

[Bruce EdneyParticipant @bruceedney59949]

So I have been a bit slack in taking pictures and posting lately. This may, in part, be due to the arrival of this into my workshop family.

[Bruce EdneyParticipant @bruceedney59949]

But here are some pictures of my progress in the last week or so.

1. The Con Rod

2. The very un-finished cylinder

3. The Con Rod links – I had no 8mm plate in stock so I used a piece of 10mm and practiced cutting metal on the Mill. Now I need to actually cut out the links.

[Bruce EdneyParticipant @bruceedney59949]

Well it has been a while

The mill has been in pieces and rebuilt as part of a CNC conversion and has taken a large chunk of my time.

Then using said mill to engrave christmas presents has taken more time.

But some progress has been made

New side plates have been milled and formed. The cylinder block has been milled and drilled and now awaits the arrival of M2.5 taps and threaded rod.

Quite pleased with how it is looking

Bruce

[Tim StevensParticipant @timstevens64731]

Next time you are in a good Motor Museum (eg Mulhouse, France) ask about the Gobron Brille car engine, around 1910. That had a similar idea but with the cylinder vertical over the crankshaft. One con rod was conventional, the other was linked by straps down each side of the cylinder to a pair of 180 degree crankpins. And internal combustion, as you might guess.

Regards, Tim

[Bruce EdneyParticipant @bruceedney59949]

Well things have been moving along for this little engine and today it got hooked up to the compressor.

And it ran

Here is a short video

I am very happy that it actually runs even with a quite small temp flywheel compared to the design.

Thanks Julius for an interesting build

[Nick_GParticipant @nick_g]

.

That's fantastic.

Nice job of an unusual engine.

Nick

[Bruce EdneyParticipant @bruceedney59949]

In the words of the Madden Brothers "We are done"

Flywheel mounted via a split tapered mandrel type of arrangement which removed a good amount of wobble. A method I will definitely look at using again.

All painted up and made reasonably shiny.

At the beginning of the month it ran for 3 days for about 4hrs per day off a small fridge compressor with my other engine.

I had the pleasure to show it off to the designer, Julius De Waal  and his wife,  last week whilst I was in Auckland on business. Julius is a lovely man and I look forward to building a few more of his designs.

Edited By Bruce Edney on 29/02/2016 06:29:37

[JasonBModerator @jasonb]

Looks good Bruce

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