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Tools/castingcrucible/induction: Difference between revisions
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{{inductioninfo}}
The [[Tools/castingcrucible|casting crucible]] is one of the most useful but also most hazardous items of equipment rLab has. Because of this people seeking induction will have to provide more safety equipment than is usual, inductees must have
equipment capabilities▼
* Cotton or other non-synthetic overalls required
* Heavy trousers, Jeans are good
* Leather shoes - NO SYNTHETICS, Steelies preferred. - Trainers are NOT acceptable
* If wanting to cast lead or other hazardous metals then a mask rated for FFP3 and metal fume. For Aluminium and copper castings then we have masked rated FFP3
Casting can only be done outdoors and absolutely must be kept dry. This limits the times when inductions can occur to Sundays when the forecast indicated no possibility of rain. Sundays because that's the only time the carpark is likely to be empty and when dry because of the risk of explosion if the crucible is rained on.
* Types of casting
** Sand casting
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* What are Sprus, Gates and Risers and why you need each of them
* 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 [[Tools/boxford|Boxford CNC Mill]].
* Printing out a mold, carving a mold from wood, high surface finish needed
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* Using the dry sand for safety
* Getting out the crucible and setting it up in the casting tray
* Selecting which crucible to use - Aluminium reside in the default crucible
* Choosing your metal and checking it over carefully
* Keeping the gas bottle well away from the burners
* Mounting the regulator
** Left-hand thread on the regulator
** Do not use PTFE tape on the thread
* Burners are self-lighting and have auto-shutoff
** Turn the blower on first and off last
* Selecting suitable metal
** Reused old castings are cheapest, but have increased risk of voids, porosity and poor strength
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* This means that before metal goes into the crucible it must be pre-warmed around the outside of the forge, and then only added in small amounts so it doesn't radically cool the crucible. Little and often is the way to add metal.
* Additions must be made carefully to avoid splashing.
* The maximum capacity of the crucible is about 3Kg of aluminium, or 10Kg of copper. That equates to the crucible being about 75% full. This is approx 1.5l of liquid metal.
Making the Pour
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* Sweeping up everything
* Putting the casting tray back
* Returning
* Dust masks to bin, they cannot be re-used
* Re-order any PPE that was damaged
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