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Inside cylinder casting patterns

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Stuart Davies 3	14/09/2010 09:44:06
16 forum posts 2 photos	Hi, I was wondering if anyone has made some patterns for inside cylinders? I intend to produce some for a 5" duchess, they basically consist of a block with four cores in, two small for the valve chests and two large for the pistons. The underside has a bit of shape and detail to it, which makes it impossible to mould the pattern vertically, as this detail would catch the sand when drawn out. I'm not a fan of loose pieces particularly, but any help would be most welcome. The four cores seem to cause the most problems as two parting lines are created-is it necessary to make a 3-part moulding box to create the two parting lines? Experienced foundryfolk please lend advice/photos! Cheers , Stuart
Bryan Rozier	14/09/2010 14:54:18
13 forum posts	Hi Stuart, With the outside being mainly rectangular is there any point in making a casting? Wouldn't it be easier / cheaper to hack it out from the solid? Cheers Bryan
Brian Oldford	15/09/2010 23:23:26
686 forum posts 18 photos	If you are only intending casting a few from time to time go with the 4 piece pattern in a 3 piece box. (http://en.wikipedia.org/wiki/Core_(manufacturing)#Cheeks)
Stuart Davies 3	16/09/2010 08:22:09
16 forum posts 2 photos	What a cheek! Thanks for your reply regarding cheeks, I was hoping that I wouldnt have to make a 3 part box, and split the pattern into 4 pieces (maybe just two pieces so that the centre portion could be removed from the cheek, the actual parting lines themselves, I think could be created by the 'oddside method', thus preventing the need for the pattern to be split into 4 pieces. Please keep suggestions coming, I'll post some photos of the final method.

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