10 replies to this topic

[Themolehole_9876]

I have been reading the through the forum and see things like '#60 Mesh' or similar. What does this mean..? is it higher the number the finer the ingredient or something... Also anyone know where u could get a decent meshing 'tool'? Another thing, pressing. I have ready through other pressing posts but basically.. Pressing means just compacted powder right..? lol (sorry about the questions, simple and obvious probably.. but you have to start somewhere!) I just want to clarify this. Thanks, Scott!

[completebeginner]

as mesh gets higher grans get smaller and pressing is putting pressure on something as to compact it if you are pressing bp you are supposed to do so with at least 2 tonnes of pressure to get a uniform density and you should search before you post as these questions have been answered before

[sizzle]

A range of meshes is available from http://www.inoxia.co.uk.

[Themolehole_9876]

Does anyone have a mesh supplier for Australia?

[seymour]

Pottery supply stores often stock them, along with other goodies, like oxides, carbonates, silicates, and if you are lucky Gum Arabic.

Here is a site that contains a table converting mesh to microns, there are a few others around but I am not sure of the adresses. My memory of whom I aquired this link off has faded away, so my humble apologies to he or she who is missing out on the credit they deserve.

Edit: http://www.hummelcro...main/custo.html You may find the actual link useful, rather than my mindless ranting.

Edited by seymour, 04 January 2006 - 01:56 AM.

[littlejohny]

I think for example if the mesh size is 60, every inch has the diameter of 60 holes.

sorry if i'm wrong, i remember reading about it some where but i don't really remember.

[Mumbles]

I don't fully understand what littlejohny is trying to say. Mesh is the number of holes per linear inch. A 60 mesh screen with have 60 openings per linear inch. I think there is a different method in metric countries, but it all works out to about the same size. A 60 mesh screen doesn't have 1/60th of an inch openings, it is actually a lot smaller than this due to the thickness of the wires.

[littlejohny]

Here is what i ment for example a 60mesh screen would have 3600 holes for every square inch.

I don't fully understand what littlejohny is trying to say. Mesh is the number of holes per linear inch. A 60 mesh screen with have 60 openings per linear inch. I think there is a different method in metric countries, but it all works out to about the same size. A 60 mesh screen doesn't have 1/60th of an inch openings, it is actually a lot smaller than this due to the thickness of the wires.

yes thats what I ment.

[newtoolsmith]

Hello friemds,

this is my first reply - I first thought, it would not work but it does.

Please dont read too accurate bercause mynglish is not the best - a little bit rusty while not often used.

One word about the sieves:

In my opinion, the american way of numbering the mesh size has no expressiveness.* The important thing is the diameter of the holes and this is varied by using thicker or thinner wires for the sieve. So the mesh size does not say anything about the size of the particles passing through.

In Germany we use the hole size give the sieves a name. Our sieves are called by example 200?m or 0.2mm what means the same.

In this way you can directly say, what size the passed particles will have or when using a stack of more sieves, in what range the fraction will be.

* Of course, everybody thinks his system would be the best.

MfG
newtoolsmith

Edited by newtoolsmith, 18 January 2006 - 07:30 AM.

[paul]

Hehe, nice input there, newtoolsmith. I?m from germany, too and what can I say. I don? t care because it is not that important to work with grains sieved exactly in the 0,1mm range

Most of the stuff even works with riced blackpowder. You only have to find out the right equivalent to the "original powder" used... Of course every grain has its ad and disadvantages but this is not THAT important most of the time

[newtoolsmith]

Tach Paul,

is dat nich sch?n hier! Lauter Deutsche.

Nee, is klar, auf die tats?chliche Korngr??e kommt es so genau nicht drauf an aber bei unserer metrischen Deklaration der Maschenweite wei? man wenigstens, was man hat (die 200?m sollten auch nur ein Beispiel sein). Dies Feature haben die Anh?nger der z?lligen Messweise halt nicht, die wissen nur, wie viele Maschen sich einen Quadratzoll teilen m?ssen. Die Drahtst?rke muss man dann auch wissen. Metrisch ist halt besser aber erkl?r das mal nem Ami...


Here a short translation for our non-german friends:

The grainsize is of course not that important but when using the metric system you actually know the resulting grainsize (the 200?m should only be an example). This feature is not available when using the american or english standart system with mesh, inch and so on. For those, the diameter of the wire used for the sieve is important to know.

Please dont try to learn german with the text above, its hardly school-like!!


MfG
newtoolsmith

Edited by newtoolsmith, 18 January 2006 - 11:42 AM.