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Twin Cylinder Steam Engine

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bogstandard:
Darren,

That doesn't look like any sash weight I have seen before, sure it isn't a welsh pattern one made out of slate. The grain on that cast certainly doesn't look like normal cast iron, it just might be cast steel, hence the crappy finish you are getting.


Bogs

sbwhart:
Hi Darren

I agree with John that sash weight could be cast steel, if your going to make new have a go with a different weight, a good old English round one  :thumbup:.

Stew

bogstandard:
Look at the alternative materials Darren, even though not recommended, you could use ali, but you would have to make sure you don't use an ali piston, and look out when cutting threads and tightening up small bolts, they could easily strip out the threads.


John

Darren:

--- Quote from: kvom on June 15, 2009, 10:27:29 PM ---Bottom plate wouldn't change.  Top plate would need different holes for mounting the block parts.

--- End quote ---

Course not, silly me....


--- Quote from: kvom on June 15, 2009, 10:27:29 PM ---Leaving it 3mm short would be bad as the inlet holes spacing would be off.

--- End quote ---

Yep, looking at the plans this morning I can see it's not going to do....

Darren:
John/Stew,

I'm not certain what material this weight is due to lack of experience. I have come across some cast "something" before that had exactly the same properties in the form of a railway cart axle clamp.

They seem quite a bit harder and grainier than say the cast iron of the milling vice which machined like butter. The finish if much rougher too.

Would cast steel still produce a dust rather than a swarf when machined, and would it break like cast iron leaving that grey crystaline texture? (I say break like cast iron, this was hardly brittle when I was belting it)

 :scratch:

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