I bought a 130mm diameter lump of aluminium rod, 460mm long, weighing 16kg, off ebay. It was described as excellent machining material, so I put it to the test. I need a driving wheel for the beam engine.
The driving wheel fits between the flywheel and the governor column.
The aluminium disk straight off the band saw. A perfect cut from a well adjusted saw. Took about 5 minutes to make the cut, using plenty of cutting fluid and slow descent of the blade in order to avoid jamming.
It turned beautifully. Using a HSS tangential tool. You can see a mirror reflection even as the turning as happening.
I have heard that the castings for the triple expansion marine engine will be arriving in the next week or so. That is good news after waiting since the order was placed in January. In the meantime, I have bought some castings and partly made components for a Burrell Traction Engine. It is 1.5″ scale, and I obtained some 1.5″ plans from EJ Winter for the Burrell. Unfortunately, one mans’ 1.5″ is anothers’ 1.45″ and the plans are not exactly correct for the castings! What would have been a difficult build, has turned into a very difficult build. So I have put it aside and will tackle it gradually. The plans will be some use, but as well as the difference in scale, there are differences in the designs. So I will have to make it up as I go, to a considerable extent. My metal working club has promoted a competition for 2014, and it appeared to be a fairly simple build, so that is what I am currently machining. See the progress in the photos below. It is a Stirling heat engine, designed by J Ridders. You can see one working on the Ridders web site http://heetgasmodelbouw.ridders.nu
Almost finished stand for the cylinder fork.
Components made so far
The spirit burner, almost finished. Copper and brass, silver soldered.