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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Calculating surface of wire mesh
Hi to all.
Can someone explain me how to calculate the surface of 10x10cm -- 1mm thick wire mesh. Its something like this : http://i01.i.aliimg.com/photo/v0/312..._Screen_02.jpg The space between wires is 5 x 7 mm. Thank you in advance |
#2
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Calculating surface of wire mesh
On Sunday, June 23, 2013 4:40:28 AM UTC-4, Goran wrote:
Hi to all. Can someone explain me how to calculate the surface of 10x10cm -- 1mm thick wire mesh. Two ways: you can approximate it as a wire grid, use known formula for area of 1mm cylinder with height = length of wire. The 'length' will ignore the fact that the wire grid is not straight wire but slightly bent. Or, you can use a scale to weigh the grid, and the known formula for volume of a length of 1mm wire, and density of the metal (copper = 8.9 gm/cm^3) to get the length. Then use the formula for area of a cylinder. |
#3
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Calculating surface of wire mesh
In article , Goran
wrote: Hi to all. Can someone explain me how to calculate the surface of 10x10cm -- 1mm thick wire mesh. Its something like this : http://i01.i.aliimg.com/photo/v0/312..._Screen_02.jpg The space between wires is 5 x 7 mm. Thank you in advance How accurate does it have to be? Why do you need to know? Anyway, the usual method is to approximate the mesh as having been woven from round wire of the same circumference as the average cross section between crossover points, and do the obvious math. Or, one can assume wire of rectangular cross-section. The wires being on diagonals makes the math messy (lengths vary with position), but still not that hard. Joe Gwinn |
#4
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Calculating surface of wire mesh
On 6/23/2013 3:40 AM, Goran wrote:
Hi to all. Can someone explain me how to calculate the surface of 10x10cm -- 1mm thick wire mesh. Its something like this : http://i01.i.aliimg.com/photo/v0/312..._Screen_02.jpg The space between wires is 5 x 7 mm. Thank you in advance Perhaps manufacturer may have detailed spec's. Otherwise, probably easiest to estimate from weight/unit area and the open area percentage that is generally available. To first approximation that and the individual strand diameter should get reasonably close. -- |
#5
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Calculating surface of wire mesh
On 6/23/2013 4:40 AM, Goran wrote:
Hi to all. Can someone explain me how to calculate the surface of 10x10cm -- 1mm thick wire mesh. Its something like this : http://i01.i.aliimg.com/photo/v0/312..._Screen_02.jpg The space between wires is 5 x 7 mm. Thank you in advance First: I think that the linked screen is expanded metal, if it makes a difference. See this zoomed-in pic: http://home.comcast.net/~bobengelhar...esh_Screen.jpg The angled blue lines show what I think is the cut line. Notice at the intersection how the zig-zag vertical element is/seems-to-be continuous. As far as calculating the surface, I would take the X-shape in the rectangle, whose size is 5 x 7 (?). The surface area is then the area of the 2 cylinders that are the diagonals (diameter 1mm). Then there are 100/5 x 100/7 of these rectangles. But if it is expanded metal, then those aren't wires/cylinders and it's a whole other ball game. Unless assuming wire is close enough. HTH, Bob |
#6
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Calculating surface of wire mesh
On 6/23/2013 2:23 PM, Bob Engelhardt wrote:
.... But if it is expanded metal, then those aren't wires/cylinders and it's a whole other ball game.... If it is expanded metal, the sheet stock was probably 1mm thick and it was probably "cut" at 1mm intervals, making the "wires" 1mm x 1mm square. Even easier than actual round wire. Bob |
#7
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Calculating surface of wire mesh
On Sun, 23 Jun 2013 10:40:28 +0200, Goran
wrote: Hi to all. Can someone explain me how to calculate the surface of 10x10cm -- 1mm thick wire mesh. Its something like this : http://i01.i.aliimg.com/photo/v0/312..._Screen_02.jpg A picture? That's a definite plus. The space between wires is 5 x 7 mm. What's the thickness of the stock and the width of each expanded wire? Is it copper, or is it steel with copper (paint?) flashed over the top? Thank you in advance That's expanded metal. What are you trying to calculate for? Electrical properties (like resistance or current carrying ability), wind resistance, strength, or what? Key Ironic Question: Why do people who post questions like these _invariably_ leave out 99% of the key data which would help others help them? sigh Now there will be 99 questions, many duplicates, to find the other data...OR, the thread might never end. It's one of those. giggle -- Shake off all the fears of servile prejudices, under which weak minds are servilely crouched. Fix reason firmly in her seat, and call on her tribunal for every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason than that of blindfolded fear. -- Thomas Jefferson |
#8
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Calculating surface of wire mesh
On 06/23/2013 11:40 AM, Bob Engelhardt wrote:
On 6/23/2013 2:23 PM, Bob Engelhardt wrote: ... But if it is expanded metal, then those aren't wires/cylinders and it's a whole other ball game.... If it is expanded metal, the sheet stock was probably 1mm thick and it was probably "cut" at 1mm intervals, making the "wires" 1mm x 1mm square. Even easier than actual round wire. I made a fish out of hammered brass sheet and wrapped it in expanded metal. It looked like scales. It was a red snapper. |
#9
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Calculating surface of wire mesh
On 06/23/2013 01:47 PM, Larry Jaques wrote:
Key Ironic Question: Why do people who post questions like these _invariably_ leave out 99% of the key data which would help others help them? sigh Now there will be 99 questions, many duplicates, to find the other data...OR, the thread might never end. It's one of those. giggle I think he wants the wetted area of a fish. |
#10
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Calculating surface of wire mesh
On 06/23/2013 08:40 PM, Bob Engelhardt wrote:
On 6/23/2013 2:23 PM, Bob Engelhardt wrote: ... But if it is expanded metal, then those aren't wires/cylinders and it's a whole other ball game.... If it is expanded metal, the sheet stock was probably 1mm thick and it was probably "cut" at 1mm intervals, making the "wires" 1mm x 1mm square. Even easier than actual round wire. Bob ----------------- It is expanded copper metal that i have to replace with copper mesh wire of 1mm thickness. The surface is important because of the size and density. I have to replace this expanded mesh with something that will look like woven copper mesh. If the wire is 1mm thick, one meter of this wire would have 31.4 cm2. This woven copper mesh should have at least 4 times the surface of this expanded metal and when this is defined, copper mesh will be set in production. Final product will be 1x1 meter sheet that will be cut into 10x10 squares and used and shielding. Because this is custom made i can not buy woven copper mesh, i have to created it. This is also no problem. The only thing that i have to sent to the factory is the surface, length of the wire and thickness of holes. |
#11
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Calculating surface of wire mesh
On 6/24/2013 2:31 AM, Goran wrote:
.... If the wire is 1mm thick, one meter of this wire would have 31.4 cm2. This woven copper mesh should have at least 4 times the surface of this expanded metal and when this is defined, copper mesh will be set in production. Final product will be 1x1 meter sheet that will be cut into 10x10 squares and used and shielding. "woven copper mesh should have at least 4 times the surface of this expanded metal" What does the above, mean, precisely? It seems that you're mixing up the projected area the mesh covers w/ the surface area of the wire. The normal way it would be specified would be either the size of the openings or mesh (as in number of threads/unit distance) or as the fractional open area. I can't really tell what you're trying to spec, precisely. .... The only thing that i have to sent to the factory is the surface, length of the wire and thickness of holes. .... Any chance you can post the factory request for spec's for reading their specifications directly? -- |
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