Abstract: An apparatus for automatizing flaw detection comprising carrier bodies arranged in parallel, on sides (Y-) and (Y,+), taps capable of supporting the both bodies and extensible from and retractable into the bodies, clamp shafts having downwardly tapered heads and vertically movably inserted in hollow shafts of the taps, and collet claws disposed around the portions of the clamp shafts near their heads, with expansion bands fitted around the claws for centripetally fastening them together, the carrier body on the (Y-) side being slidably supported by X-direction guide rods and the carrier body on the (Y,+) side by the X-direction guide rods and Y-direction guide rods.