![]() ![]() The results speak for themselves - see for info.ĭISCLAIMER: Material presented on the 911METALLURGIST.COM FORUMS is intended for information purposes only and does not constitute advice. Now this really is a major step forward and, frankly, blows away anything that came before it. We pioneered all of these products and continue to learn from them with new innovations, the latest one being the Progradex Sampling System. That said, cone splitters have now had their day as well, including the rotary/rotaport design that followed the original. That is one of the many reasons why cone splitters exposed riffle splitters for what they are flawed, flawed, flawed. At best, it will just confuse you into a false sense of security. It is not therefore a "duplicate" sample at all and should not be used for any kind of QAQC. A tiered riffle splitter, on the other hand, takes a primary sample ONLY and then splits it in half at the end for a duplicate. Perhaps a better way of explaining the above is that a cone splitter will take a primary and duplicate split from the bulk sample. And it was the Metal Craft Cone Splitter that was used in the paper mentioned above. And then the duplicate is supplied from simply splitting the material from the final tier in half after bulk bias has occurred but the real joke is that and even with this flaw in its favour, it still can't provide a repeatable sample (tending to bias to the duplicate side on the graph.Īs for the cone splitter, don't know without more information, other than to say, there are a lot of poor copies from the original Metal Craft Cone Splitter around now. In other words, any bias from tier to tier, of which there will be a lot, is not represented in the primary or duplicate sample. The riffle splitter's "apparent" repeatability can't be relied upon because the duplicate is taken from the last tier only (the final part of the split), not all the way through the individual tiered splits. Could do with seeing Q-Q Plots to establish systemic bias and photos to establish set up - photos will probably explain most things. ![]() It’s difficult to make a final judgement without more information. ![]()
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