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120-Mesh Sieve: U.S. Standard Sieve No. 120 (Bureau of Standards, 1924)
The standard testing sieve No. 120: plain-woven brass or bronze wire cloth with 0.125 mm (0.0049 in) openings and 0.086 mm (0.0034 in) wire, soldered smoothly into a round frame about 20 cm (8 in) across.
Result: a sieve that passes grains under 0.125 mm and holds back larger ones, made to the Bureau of Standards tolerances.
Source: Bureau of Standards, Letter Circular 74, Standard Specifications for Sieves (revised 1924). Unknown: the frame metal and the weaving. Picture: the Bureau's table.
Katamtaman
Unknown
Mga Tagubilin
1
1
Weave the wire cloth
Weave the wire cloth
Weave plain (not twilled) cloth from brass, bronze or other suitable wire 0.086 mm (0.0034 in) thick, so the openings between adjacent wires are 0.125 mm (0.0049 in) each way, about 120 wires to the inch. Ours: bronze wire. Not given: how it is woven.
Mga materyales para sa hakbang na ito:
Kawad na tanso-lata1 warp and shoot wiresMga kailangang kasangkapan:
Habihan ng wire cloth2
2
Make the frame
Make the frame
Make a circular frame about 20 cm (8 in) across, with about 5 cm (2 in), or 2.5 cm (1 in), between its top and the cloth. Ours: brass strip. Not given: the frame metal.
Mga materyales para sa hakbang na ito:
Guhit na tanso1 frameMga kailangang kasangkapan:
Gunting na pangyero
Panghinang3
3
Mount the cloth
Mount the cloth
Mount the cloth on the frame without distorting it. Fill the joint between cloth and frame smoothly with solder, so the material being sieved cannot catch in it.
Mga materyales para sa hakbang na ito:
Panghinang na lata-tingga1 joint
Flux1 jointMga kailangang kasangkapan:
Panghinang4
4
Check it against the tolerances
Check it against the tolerances
Measure the warp and shoot wires separately. Their average opening must be 0.125 mm within ±6 %, their average diameter 0.086 mm within −15 to +35 %, and no opening may exceed 0.125 mm by more than 40 %. Reject a sieve with punctures, loose or wavy cloth, poor soldering, or too many large openings.
Mga kailangang kasangkapan:
Mikrometro
Lente ng PampalakiMga Materyales
4- 1 warp and shoot wiresPlaceholder
- 1 framePlaceholder
- 1 jointPlaceholder
- 1 jointPlaceholder
Mga Kinakailangang Kasangkapan
5- Placeholder
- Placeholder
- 2 vendors sell this, none ship to you yetPlaceholder
- Placeholder
- Placeholder
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