I understand that after cremation, the remains are put through a crenulator to reduce them to ashes and to sift out metals. I assume it's a sort of shaker/sieve.
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The word you're looking for is cremulator a device to grind the bone fragments that remain after cremation into fine powder.
It's probably a slightly macabre jokey extension from crenulate/crenate (having a notched or scalloped edge, as certain leaves) in reference to the fact that notched rollers are likely to be part of the grinder.