Brass piston in Drawn Gunmetal cylinder?

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Steve - 29 May 2006 17:10 GMT

Is this OK for a low pressure steam engine?

Fabricated the set first and then thought about it!

Thanks

Steve

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small.planes - 29 May 2006 20:36 GMT

Im not an expert (pretty new to this myself), but AFAIK if the pisto
and cylinder are differing metals it should be ok. (awaits mor
experienced (older ;) reply)

Dav

--
small.plane

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Mike cole - 30 May 2006 05:19 GMT

Hi Steve
Yes brass piston and gunmetal cylinder will be fine.

Mike Cole

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Steve - 30 May 2006 06:58 GMT

> Hi Steve
> Yes brass piston and gunmetal cylinder will be fine.
>
> Mike Cole

Thanks - I'll press on (hopefully a better fit than that!).

Steve

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Alastair - 30 May 2006 11:29 GMT

My only concern would be that brass tends to become brittle and degrade
when in contact with steam - a mate of mine used to work on a preserved
railway and told me of the problems they had with brass and steam. I
don't know how serious a problem this would be on a model engine.

Cheers
Alastair

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Steve - 30 May 2006 22:32 GMT

> My only concern would be that brass tends to become brittle and degrade
> when in contact with steam - a mate of mine used to work on a preserved
[quoted text clipped - 3 lines]
> Cheers
> Alastair

The cap heads are 3mm to give a scale. Far too big! If this runs long
enough for the brass to become brittle it would be fantastic!

http://www.btinternet.com/~steve.withnell/Cylinder/DSCN2859.JPG

Turned on my C6B, milled on my Warco Mill/Drill and brazed with my Bulldog
torch. Not a casting in sight, only scrap out of the box. Flange PCD
co-ordinates from excel. Well chuffed.

Steve

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Model Forum / General / Models / May 2006

Brass piston in Drawn Gunmetal cylinder?