I have a lot of mixed Lego, is it possible to calculate sieve screen dimensions to sort out particularly lego categories like bricks or plates ?

So you can say if I use this screen size and dimensions of holes i will sort out xx% of this range of items.

I think it should be possible but i do not know how to start. I want to calculate it from a mathemical point of view. Any suggestion is welcome.

  • $\begingroup$ For some geometric shapes this is possible, for others it is not. One could, for instance, not separate a cylinder and a hollow cylinder of same outer dimensions with a sieve, alone. That would require an additional mechanism, e.g. separation by mass or average density. $\endgroup$
    – CuriousOne
    Commented Jan 19, 2016 at 11:40
  • $\begingroup$ This is similar to any stone&gravel quarry's sifter, which uses a sequence of fine-to-coarse sieves to separate sand, gravel, small stones, large stones. The longer you "shake" over a given sieve, the higher percentage of objects which can fall thru actually do fall thru. $\endgroup$ Commented Jan 19, 2016 at 13:18
  • $\begingroup$ but is it possible to calculate the optimal geometry to let throug tine objects (plates) or only thick objects (bricks) ? $\endgroup$
    – pwghost
    Commented Jan 19, 2016 at 14:39


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