Northumbrian CYLINDER DRAWINGS

[bellerophonParticipant @bellerophon]

I’ve only just started the piston/cylinder assemblies. There seems to me to be a mistake in the drawings for the steam passages in that the two 3/32 steam passages from the steam chest  are shown on the side projection as going out on the face where the cylinder covers fit – if that were the case the team wouldn’t be admitted into the cylinder bore itself unless the cover had a bypass passage fitted.

 

THe end projection seems to suggest a filed passage is made into the cylinder bore but this isn’t shown on the drawing –

 

I’m going to use the technique I used on the Stuart Vertical 10 (also being shown in ME at present) of milling a small relief at the end of the cylinder which will cut into the 3/32 passages 

 

 

[bellerophonParticipant @bellerophon]

? Mistake

[JasonBModerator @jasonb]

The text describing the drilling of the passages says “begin by filing a chamfer on the end of the cylinder bore” This is whats shown on the end elevation but there should really be a  line to show this on the section

 

And remember to file the chamfer deep enough so it is not blocked by any spigot on the cylinder covers or file a matching notch into teh cover spigots

 

Jason

[Author]

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