Twin Cylinder Steam Engine

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Darren:
I thought I'd have a go at starting the cylinder block tonight from a sash weight.

I picked on the square one of my 3 that I have

Scored all four sides with the disk cutter, inc the end as suggested by Bogs :thumbup:

Took it outside and threw it against the concrete floor, nothing happened, tried again, and again, and again. By now I was really belting it.
I resorted to finding a granite rock in the garden and whacking it against a sharp edge along the score marks. It took several goes but finally it gave in.

I then tried to knock the end off with a sharp cold chisel and a lump hammer. I gave up in the end, I just couldn't hit it hard enough.
I was suprised just how tough this cast iron is, didn't seem very brittle to me :lol:

I then decided that to remove the hard abrasive crust I would lathe it off with a half beaten carbide tip. After all I have enough of them and better that than ruin a milling cutter I thought. Managed it too with just the one tip.... :thumbup:

It was very uneaven and the surface slightly porus so took a bit of doing.

Off to the miller for a tidy up

Alas, it looks as if it's going to be a tad too small in height, ended up at 29mm and the plans call for 32mm, not much in it but 3mm is 3mm.

Not sure what to do now, I don't currently have any other suitable material....... :bang:

Divided he ad:
Personally I'd get another one made similar to that one and make 2 single cylinders out of 'em.... Round off the outsides etc, make a feature out of 'em

Then use the head etc to tie them together.

Well that's what I'd do anyway :borg:

Waiting to see this run still...... Do I have to do the rain dance some more to keep you inside and working? :ddb:

Ralph. :)

Darren:
You know I was thinking exactly the same thing, just not shure if I'd be making life a bit too hard for myself...dunno why, fear of the unknown I suppose... :scratch:

You can do a rain dance and spoil my garage build if you like, but only if you video it and stick it on Utube :lol: :lol: :lol:

Garage is coming along....I'll have to do an update.... :)

Darren:
Slight problem with the two cylinder idea,

Top and bottom plate are drilled for one block....I'd have to make some new ones.... :bang:

How about a slightly shorter piston and/or a thicker head with the 3mm built in?

Tired now, will look at the plans tomorrow...

kvom:
Bottom plate wouldn't change. Top plate would need different holes for mounting the block parts.

Leaving it 3mm short would be bad as the inlet holes spacing would be off.

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