Shot or sand blasting machine

In a shot blasting machine for blasting elongated rod-like material, said machine comprising a substantially closed housing, means rotatably mounting a first centrifuge wheel in said housing, means rotatably mounting a second centrifuge wheel in said housing spaced from said first centrifuge wheel to define a blasting zone in said housing between said centrifuge wheels, means defining an inlet for blasting shot to said housing, means for conducting said rod-like material through said blasting zone in said housing, and means defining an outlet from said housing for scale blasted from said rod-like material, the improvement comprising driving means for rotating said first centrifuge wheel and said second centrifuge wheel in the same direction as each other, wall means dividing said blasting zone into a first section and a second section, said wall means having means permitting the passage of said rod-like material therethrough, a first guide device disposed adjacent said first centrifuge wheel in said first section, and a second guide device disposed adjacent said second centrifuge wheel in said second section, said first guide device being operative to guide the blasting shot from said first centrifuge wheel through said blasting zone to said second centrifuge wheel and said second guide device being operative to guide shot from said second centrifuge wheel through said blasting zone to said first centrifuge wheel, whereby said blasting shot is circulated between said first and second centrifuge wheels and is accelerated thereby and through said blasting zone to blast said rod-like material conducted therethrough.