Edited by BigG, 08 September 2004 - 09:06 AM.
Mesh
#1
Posted 23 April 2003 - 11:47 AM
#2
Posted 21 June 2004 - 05:18 PM
But I wonder how large the grains should be, I red somewhere that it should be 6 mesh. But then how large is 6 mesh in millimetres or centimetres?
Marcel
#3
Posted 21 June 2004 - 05:37 PM
You don?t need to make grains. A powder may work as good. But a to coarse powder, and it will not solidate good enough.
There are many posts in this forum about rockets. Please make a serch and you will surely get a lot of info.
http://www.freewebs....biki/Index.html
#4
Posted 21 June 2004 - 06:08 PM
#5
Posted 21 June 2004 - 07:23 PM
I think this picture shows it......
#6
Posted 21 June 2004 - 07:41 PM
I found a lot of info on this site.
thanks agen.
Marcel
#7
Posted 31 August 2004 - 07:33 PM
please tell me what is mesh and how will i know what is the mesh of my Al,Fe etc.
Thank you
#8
Posted 31 August 2004 - 08:09 PM
depending what size mesh your Fe / Ti etc passes through will tell you what size it is.
Mark
BPA L1 & L2
#9
Posted 31 August 2004 - 08:17 PM
mesh is a way to measure small things (like you didn?t understood that...)
if you have Al that is 300 mesh then you can put 300 pieces of Al in a row so they cover 1 inch. The synonym of mesh is also web, net. And that?s how you measure it, you have a net whit some tiny holes in and those particles that fall through are smaller then the mesh is on the net or web?
the stupid thing about mesh is that it's only you guys in the UK that use it, all the other people uses microns... it is the same thing whit inches, it's just you an the usa that uses it. (maybe some other countries but that I don't know)
anyway. that?s how it is.
#10
Posted 08 September 2004 - 09:25 AM
First NEO, the mesh standard is an international standard. The American were the first one to move away from it, and generally the mesh system is still used more then millimetre system. There are reasons for that, although I suspect they will all move to microns at some point.
Second, the definition on this thread suggests that mesh 4 will have an Aperture Sizes of 25.4/4 = 6.35 millimetre, and that is wrong. Mesh #4 hole is 4.75 millimetre. By the same logic mesh #200 is 127 micron where is real life it’s only 75 microns.
The definition is right, you will have 4 holes over an inch on a four mesh screen, and 200 holes an inch on a 200 mesh screen. However, the wire itself takes some space as well, and this count to the difference between the simple division and reality.
To know how much microns are in a specific mesh you need a mesh table. Here is a link to the best sieves company in the world (British naturally) and their specification table. If you roll down the screen you will find the American standard and near it an international standard alternative. This is a good table to use for converting mesh size into microns.
http://www.endecotts...cifications.htm
Edited by BigG, 08 September 2004 - 09:25 AM.
#11
Posted 29 September 2004 - 04:22 PM
What does it mean when a mesh is given as a minus number eg
'Aluminum, flake, flitters, coarse
-20 mesh, dark flake, coated. Eckhardt (German) #41813/G
Used in glitter compositions.'
This is from the skylighter web page.
#12
Posted 29 September 2004 - 05:13 PM
+Number = Particles retained on the screen
-Number = Particles pass the screen
Number = Particles pass the screen
#13
Posted 21 November 2004 - 10:53 PM
My question is regarding mesh sizes. I am not familiar with these, so as to have some sort of idea what people are describing, can anyone tell me the approx. mesh size of say......sugar salt and flour, and what it means when there is a - (minus) sign in front of a mesh size. thx
Andrew.
#15
Posted 21 November 2004 - 11:25 PM
However, the wire itself takes some space as well, and this count to the difference between the simple division and reality.
I wonder if anyone could tell me if the diameter of the wire is somehow proportional to the apeture size. There must be some sort of standard of thickness because, if not, then the size of the partical could be different depending on the thickness of the wire in any one sieve. A sieve with one mm apetures and one mm thick wire would have a 'mesh' size of 12 right? but the same sieve with 0.1mm thick wire would have a mesh size of around 23, even though the particals are the same size. Microns are the true size of the apeture though. Can anyone answer this?
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users