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Formulas provided below were derived from
ASTM E2016-15
Mesh Count Tolerance |
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The allowable
deviation in the mesh count shall be applied separately for warp and shute (weft) directions in accordance with the table below: |
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ASTM E2016 - 15 Table 7
Tolerance in Mesh Count |
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Mesh |
Warp |
Shute |
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Coarser
than 30 mesh, incl |
+/- 2% |
+/- 5% |
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Over 30
to 200 mesh, incl |
+/- 2% |
+/- 4% |
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Finer
than 200 mesh |
+/- 3% |
+/- 4% |
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Note:
(A) |
"Warp"
'The
Length Direction as Woven |
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Shute The direction across the width of the
weave (at a right angle to the Warp Direction) |
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4 |
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This information was based on a standard wire cloth product
specification : P/N: 80X80-0-0055-T-304-PW |
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80 X 80 Mesh,
0.0055" Diameter Stainless Steel, Plain Woven Wire Cloth
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Formula to
calculate the nominal opening: size:
1 / 80 0.0055
= 0.007 Opening Size |
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1. |
Convert the warp tolerance +/- 2% into number of meshes per lineal inch. |
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80 Mesh Warp + 2%
80 x .02 = 1.6, 80 + 1.6 = 81.6 Mesh |
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80
Mesh Warp - 2% 80 x .02 = 1.6, 80 - 1.6 = 78.4 Mesh |
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Compute the opening size based on a mesh count of 81.6 |
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Opening = (1 / # Wires per Inch) - Wire Diameter |
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1 /
81.6 0.0055 = 0.006754 Minimum Warp Opening Size |
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Compute the opening size based on a mesh count of 78.4 |
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Opening = (1 / # Wires per Inch) - Wire Diameter |
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1 /
78.4 0.0055 = 0.007255 Maximum Warp Opening Size |
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4. |
Convert the shute tolerance +/- 4% into number of meshes per lineal
inch. |
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80
Mesh Shute + 4% 80 x .04 = 3.2 80 + 3.2 = 83.2 Mesh |
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80
Mesh Shute - 4% 80 x .04 = 3.2 80 - 3.2 =
76.8 Mesh |
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5. |
Compute the opening size based on a mesh count of 83.2 |
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Opening = (1 / # Wires per Inch ) - Wire Diameter |
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1 /
83.2 0.0055 = 0.006519 Minimum Shute Opening Size |
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6. |
Compute the opening size based on a mesh count of 76.8 |
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1 /
76.8 0.0055 = 0.007520 Maximum Shute Opening Size |
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7. |
Convert Maximum/Minimum Warp Opening
Dimensions to a +/- Tolerance |
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0.007255 - 0.006754 = 0.0005 Warp Opening Tolerance
0.0005/2 = +/- 0.00025" |
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8. |
Convert Maximum/Minimum Shute Opening Dimensions to a +/- Tolerance |
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0.007520 0.006519 = 0.001 Shute Opening Tolerance
0.001/2 = +/-
0.0005" |
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