Monday, 11 January 2010

Boiler Fittings: Steam Outlet

The steam outlet is a fitting at the top of the boiler that provides a threaded attachment for the main steam line. It is made of brass; of which we start with a small block on the mill drilling the passages out.


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Once that is done we cut out a small bit of waste to make our lives easier when we mount in the lathe.


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Using a spring loaded wobbler (actually it is the Taig live center, but it does double duty here) center the part so that the first boss can be turned.


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Turning complete now we have to thread 5/16-32 ME - a common size for commercially available nuts and tails.


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Threading complete. I also turned a small semicircular groove where the boss meets the square section and chamfered the end.


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Here is a shot taken whilst turning the groove on the other boss. This boss is at 90 degrees to the other one and is smaller - in this case 0.250".


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This boss gets threaded 1/4-40ME and chamfered as well. Note the piece of soft aluminium protective packing between the chuck jaw and the part.


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The finished article.


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