Jasonb

Why, well the small hobby lathes with their electronic variable speed become a bit gutless as you reduce the revs as work gets larger...

From a practical point of view what I would say if you intend to make it is can it be done. In those crank case halves I see a lot of...

Steam in the top. Plenty of detail on the patent https://patents.google.com/patent/US329954A/en

this sort of thing https://fineartamerica.com/featured/robbins-steam-engine-patent-drawing-from-1885-vintage-aged-pixel.html

I would assume the rocking valve has two "passage" offset at the required angle so that while one piston is open to the inlet steam the...

Pat if it is a rocking valve which I am sure it is then go look at your Dads engine with the rocking valve. It is really just like a...

I put something between the two broken ends to spread them to the required gap. Heat as evenly as possible otherwise you can get an egg...

Marine Twin Boat Have a read here. Also look under the "marine" heading for more detailed descriptions of each...

All three were available from 1928. The Star upto 1941, The Sun upto 1990 and you can still buy the Sirius castings. Then there are the...

The small blanked off one may well be to allow high pressure steam to the LP cylinder, sometimes used just for starting via a "simpling...

Grey iron will be fine for casting model pistons you don't need ductile. Likewise for Aluminium pistons for open crank hit and miss...

I break the ring, spread it and heat treat and then put it squarely in the cylinder and set the gap. 15thou sound sounds a lot on a...

A cup chuck or ali ring will spread the load in a similar way to soft jaws as some of that gun metal can be quite soft.

George, with your "twist" do you get the correct cross section If I did similar in alibre it would not give the correct cross section...

You have two options for the crank. First turn the actual shaft parts so you have something true and round to hold then 1. make a block...