(57) The apparatusforcalibrating granite, marble, and the like in slab form, comprises
a base frame on which a carpet conveyor (2) fortransporting slabs (40) to be calibrated
is caused to run and carries a calibrating head (10) which is movable perpendicularly
to the plane of lay of the slabs (40). The calibrating head (10) includes a calibrating
roller (20) driven rotatively about its own axis and having its axis substantially
parallel to the plane of lay of said slabs (40) and substantially perpendicular to
the direction of advance of the slabs (40). Furthermore an abrasive form (30), provided
on the lateral surface of said roller (20), extends unbroken around the roller (20)
into a substantially helical pattern.
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