A rotor, used particularly in a rotating tool for machining workpieces, includes a rotor base body with locations, which are formed on the periphery thereof in an interspaced manner and which are suited for fitting the rotor with functional elements. The rotor base body includes a first, radially outer base body element and a second, radially inner base body element. When the rotor is not rotating, a jointing pressure prevails along an encircling joining line, which is formed between both base body elements. The second, radially inner base body element has a higher modulus of elasticity than that of the first, radially outer base body element.