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KECANTIKAN & KESEJAHTERAAN
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BUDAYA & SEJARAH
HIBURAN
ALAM SEKITAR
MAKANAN & MINUMAN
KEJURUTERAAN TERBALIK
SAINS
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TEKNOLOGI
BOLEH PAKAI
60-Mesh and 80-Mesh Sieves: U.S. Standard Sieves No. 60 and No. 80 (Bureau of Standards, 1924)
Two standard testing sieves made the same way; only the wire and the opening change with the sieve number. Plain-woven brass or bronze wire cloth is soldered smoothly into a round frame about 20 cm (8 in) across.
No. 60 has 0.250 mm openings (the 60-mesh sieve); No. 80 has 0.177 mm openings (the 80-mesh sieve). The finer the cloth, the finer the grains that pass.
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.
Pertengahan
Unknown
Arahan
1
1
Choose the sieve number
Choose the sieve number
The sieve number sets the wire and the opening (Bureau of Standards table, 1924):
No. 60: opening 0.250 mm (0.0098 in), wire 0.162 mm (0.0064 in).
No. 80: opening 0.177 mm (0.0070 in), wire 0.119 mm (0.0047 in).
The opening is the clear space between adjacent wires. No. 60 passes grains under 0.250 mm; No. 80 passes grains under 0.177 mm.
2
2
Weave the wire cloth
Weave the wire cloth
Weave plain (not twilled) cloth from brass, bronze or other suitable wire of the diameter for your sieve number, spacing the wires so the opening is as in the table each way. Ours: bronze wire. Not given: how it is woven.
Bahan untuk langkah ini:
Dawai gangsa1 warp and shoot wiresAlatan diperlukan:
Alat tenun kain dawai3
3
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.
Bahan untuk langkah ini:
Jalur loyang1 frameAlatan diperlukan:
Gunting kepingan logam
Alat pematerian4
4
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.
Bahan untuk langkah ini:
Pateri timah-plumbum1 joint
Fluks1 jointAlatan diperlukan:
Alat pematerian5
5
Check it against the tolerances
Check it against the tolerances
Measure the warp and shoot wires separately. For both numbers the average opening must be within ±6 % of the table, the average wire diameter within −15 to +35 %, and no opening may exceed the table opening by more than 40 %. Reject a sieve with punctures, loose or wavy cloth, poor soldering, or too many large openings.
Alatan diperlukan:
Mikrometer
Kanta PembesarBahan
4- 1 warp and shoot wiresPemegang Tempat
- 1 framePemegang Tempat
- 1 jointPemegang Tempat
- 1 jointPemegang Tempat
Alatan Diperlukan
5- Pemegang Tempat
- Pemegang Tempat
- 2 vendors sell this, none ship to you yetPemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
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oleh Tex
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oleh Forge
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