Duncans Metal Pages
Casting #1
Last updated: 30 Nov 2016

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04-Aug-2002, The game plan: Duplicate a hub puller casting, it allows some green sand to be made up, and checks the flasks are OK etc.

The reality: Click on the picture, I cannot imagine it getting any worse than this.

There may be a number of reasons this went wrong:

  • Metal poured too cold (it was only just glowing deep red).
  • Moulds treated carelessly.
  • Insufficient water in the sand?  Or too much?  Mix was 20 parts silica sand to 6 parts fireclay, with 1 part water by volume.  I was expecting steam to come out during the pour, and I didn't see any.
  • Green sand not mulled enough.
  • Insufficient venting.  Check the vent risers, they only went up about half an inch.
  • Sprue too thin.

All of the problems above are fixable.  I just need to get some time to fix them ;-)

Click here for casting #2

 

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Warning: These pages consist of images and descriptions of equipment which can reach high temperatures creating hazardous and potentially dangerous situations.  These pages should not be taken as a step by step guide on how to construct any items or carry out any particular procedure, nor should any references to safety contained herein be taken to guarantee safety in all situations.