Inside cylinder casting patterns

Inside cylinder casting patterns

This topic has 4 replies, 3 voices, and was last updated 16 September 2010 at 08:22 by Stuart Davies 3.

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14 September 2010 at 09:44 #21727
Stuart Davies 3
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@stuartdavies3
Inside cylinder casting patterns
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14 September 2010 at 09:44 #55604
Stuart Davies 3
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@stuartdavies3
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
14 September 2010 at 14:54 #55628
Bryan Rozier
Participant
@bryanrozier80712
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
15 September 2010 at 23:23 #55706
Brian Oldford
Participant
@brianoldford70365
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)
16 September 2010 at 08:22 #55715
Stuart Davies 3
Participant
@stuartdavies3
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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