Is there a method that has to be adhered to, for the sampling of stock and in-process media?

Do my samples have to be taken from the hopper every time, should a range of samples be taken and tested?

Do we need a sample separator for the new stock?

Unfortunately we don't mention methods in our documents. It would be nice to have a consistent method applied, such as gathering a 1.5 Kg sample and splitting it down to 100 grams. The sub-sample for shape could be taken from this lot. Next, either 100 grams or the remainder of the sub-sample would then be presented for sieve analysis. The sieve analysis does not have to start with 100 grams as often believed. The procedure works in percentage. Using 100 grams has become accepted because of the ease of reporting.

I bet quite a few folks dispose of perfectly good peening media do to improper sampling techniques. Take your sample after it has been through the screening system.

These are two products I use, an accurate sample is key!
As Jack mentioned a sub-sample of shape is also to be taken out if this sample. However, the shape inspection must be performed prior to sieve analysis.

http://www.globalgilson.com/productdisplay.asp?group=SampleReducer

http://www.globalgilson.com/productdisplay.asp?group=JonesCarpcoMicroSplitters