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Tools/castingcrucible/induction: Difference between revisions
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* How the mold is mounted to the boards, creates the cavity which can then be filled with metal, what is cope, drag and board.
* You have to be able to align the 2 parts of the mold using pins
* You have to be able to
* Using cores if you need complex shapes but we won't cover that
* Consider how the metal will flow, small cavities are hard to fill, there needs to be a path for metal to get in and gas to get out
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* Design them into the mold, or cut them afterwards once you've made the sand form
* The possibility of designing, 3D printing, Casting and then finishing on the boxford.
* Printing out a mold, carving a mold
Getting set up
* Casting must only be done outdoors, and only in good weather
* Getting out the casting
* Using the dry sand for safety
* Getting out the crucible and setting it up in the casting tray
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Making the mold
* Mounting the board to the cope and drag
* The sand is builders sharp-sand and bentonite clay with a small amount of water to make it stick together, too little water and it falls apart, too much and steam will prevent filling
* Screening the sand to remove lumps
*
* Packing the sand down hard and completely filling the drag
* First sand layer must be very fine and carefully forced into the smallest of gaps, later layers can be larger and less careful
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* Tapping and releasing the mold
* Touching up any defects, large defects mean starting again
*
* Piercing gas holes to release steam and other gasses
* Reassembling the mold
* Using the
Safety equipment and hazards
* Hazards
** Any water getting into molten metal WILL EXPLODE, so we can't cast on days with even the slightest chance of rain. Drinks must be kept well away from the crucible. Check your metal stock carefully for liquids or voids as voids will also explode on heating. Check the sand in the casting tray is dry
** Sand tends to make melt stop and set, it'll run long distances on other surfaces and start fires at considerable distances
** Burns are an obvious hazard, basic information about burns treatment and when to call an ambulance
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*** Check all gas equipment for any leaks
** Sudden temperature changes causing cracking/shattering, Cold metal should never directly touch hot, pre-warm stuff
** Risks of bystanders - Let people at rLab know,
* Safety equipment
** Overalls required - NON-SYNTHETICS ONLY!!
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