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Tend banks of sifting and purifying machines.

What does a Bolter do?

Tends banks of sifting and purifying machines that separate fine flour from coarse flour or middlings: Opens spouts and adjusts feed slides to route flour to machines and to regulate flow across sifters without overloading. Feels sifted flour to detect uneven texture that indicates breaks in screens. Pulls screen frames from machine to locate and replace broken screens. Records weights of flour grades produced as indicated on automatic scales. May collect flour samples periodically for laboratory testing. May perform color tests of flour, comparing color of various batches to maintain quality of milled product. May be designated according to machine tended as Purifier.