Method and apparatus for controlling shot-blasting machines

An apparatus for the continuous processing of workpieces of the type having a rotatable drum and centrifugal blasting medium impeller means for shot blasting workpieces in the drum, and wherein the supply of the quantity of workpieces to the drum varies with time, the apparatus including

• transducer means for measuring the quantity of workpieces to be blasted per unit time and for producing a signal representative of that quantity;
• means coupled to the drum for controlling the rate of passage of the workpieces through the drum;
• and
• a regulating circuit coupled to said means for controlling and responsive to the signal from said transducer means for varying the workpiece rate of passage as a function of workpiece quantity whereby a substantially uniform blasting effect on the workpieces is achieved independently of the quantity supplied.

An apparatus for the continuous processing of workpieces of the type having a rotatable drum and centrifugal blasting medium impeller means for shot blasting workpieces in the drum, and wherein the supply of the quantity of workpieces to the drum varies with time, the apparatus including

• transducer means for measuring the quantity of workpieces to be blasted per unit time and for producing a signal representative of that quantity;
• means coupled to the impeller means for controlling the amount of blasting medium supplied to said impeller means;
• and
• a regulating circuit coupled to said means for controlling and responsive to the signal from said transducer means for varying the amount of blasting medium supplied as a function of workpiece quantity whereby a substantially uniform blasting effect on the workpieces is achieved independently of the quantity supplied.