View source for Odd-side Moulding

[[File:GnomonSupport.png|300px|right]]
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=====Description=====

'''Odd-side Moulding''' ''(aka '''Coping Out''')'' is most useful for parts that have no clear flat surface which would create a parting line but can also be used as a way of casting simple shapes for which making a split pattern might be considered excessive. It is a useful technique also for replicating original ‘found’ objects.


The '''[[Cast Aluminium Sundial|Gnomon support bracket]]''' shown has only one curved edge and, although a split pattern would be the 'classic' approach, '''Odd-side Moulding''' will achieve the same end result. It will also serve to illustrate the '''Odd-side Moulding''' process.


[[File:Oddside5.png|400px|right]]
=====Moulding the Odd-side=====

The '''Drag''' is first rammed up full with moulding sand and strickled off flat. The packed sand is then dug out to accommodate half the pattern ''(e.g. up to the half way line or up to a suitable curved face - if the latter then some extra sand may need to be built up around the pattern to create a curved joining face)''.


Moulding Tools are used to smooth everything off and '''Parting Sand''' added to stop the two halves of the mould sticking together. Add the '''Cope''' then ram up and strickle this off as normal for '''[[Sand Casting]]'''.


[[File:Oddside6.png|400px|right]]
=====Completing the Mould=====

Separate the two halves of the '''Moulding Flask''' and ensure the pattern stays in the '''Cope''' - re-insert if necessary. 


Knock out the temporary packing of sand in the '''Drag''' ''(this is the ‘odd side’)'' and re-assemble on to the upside down '''Cope'''.


Add '''Parting Sand''', ram up the '''Drag''' and strickle off. Separate the two halves of the '''Moulding Flask''' again, cut '''Sprues''' and '''Gates''' and remove the pattern as for normal '''[[Sand Casting]]'''. Add a '''Runner Cup''', vent, weight and pour.  
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<span style="color: red">'''Safety Point!'''
'''Pouring molten metal is extremely dangerous!'''
* <span style="color: red">Ensure there are no trip hazards between the furnace and the moulding tray containing the flask.</span>
* <span style="color: red">Make sure that any tools introduced into the melt ''(e.g. to remove '''Dross''')'' are pre-heated and dry.</span>
* <span style="color: red">Wear full face shield, leather gauntlets and apron.</span>
* <span style="color: red">Use purpose made '''Crucible Tongs''' and '''Carriers''' to carry the [https://en.wikipedia.org/wiki/Crucible '''Crucible'''] to the moulding tray and pour.
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[[Category:Casting]]