Abstract: The attachment is intended for use with a machine tool comprising rotary tool means and a rotary spindle for driving said tool means and comprises a shaft adapted to be connected to said spindle for rotation therewith, a rotary bearing carried by said shaft, a pantograph mounted on said bearing for an angular movement relative to said shaft about the axis thereof and adapted to carry said tool means at a distance from said axis, a tracer carried by said pantograph at a distance from said axis, and an angled drive mechanism and operatively connected to said main shaft and adapted to be operatively connected to said tool means when they are carried by said pantograph. Said tool means are adapted to be driven from said spindle through said drive means during an angular movement of said pantograph about said axis.