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Greensand Casting Sand
Green sand is moulding sand that is used damp: fine silica sand bound by a little clay and water, so it packs firm round a pattern, holds a sharp shape, and lets steam escape when hot metal is poured. 'Green' means unbaked, not the colour. Bentonite clay is the usual binder; the mix is tempered with water until a squeezed handful holds its shape and breaks cleanly.
Baguhan
1 hour
Mga Tagubilin
1
1
Sieve the sand
Sieve the sand
With a dust mask on, sieve dry fine quartz sand to remove stones and lumps.
Mga materyales para sa hakbang na ito:
Buhangin ng Kuwarso20 kgMga kailangang kasangkapan:
Bistay na Pinong Lambat
Maskara Laban sa Alikabok2
2
Add the clay
Add the clay
Weigh in bentonite at about a tenth of the sand's weight and mix it through dry in the trough until the colour is even.
Mga materyales para sa hakbang na ito:
Luad na bentonite2 kgMga kailangang kasangkapan:
Timbangan
Labangan ng paghahaloMaskara Laban sa Alikabok3
3
Temper with water
Temper with water
Mist water over it a little at a time, rubbing the sand between your hands and through the sieve to spread the clay and water evenly.
Mga materyales para sa hakbang na ito:
Tubig1 litroMga kailangang kasangkapan:
Boteng pang-ambon ng tubigBistay na Pinong Lambat4
4
Squeeze test
Squeeze test
Squeeze a handful. It should hold the print of your fingers and break cleanly in two when bent, not crumble or stick to your hand. Add sand if sticky, water if crumbly.
5
5
Store damp
Store damp
Keep it covered in a lidded bucket so it stays damp; re-temper before each use.
Mga kailangang kasangkapan:
Timbang metal na may takipMga Materyales
3- 20 kgPlaceholder
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- 1 litroPlaceholder
Mga Kinakailangang Kasangkapan
6- Placeholder
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