Arrangement for measuring the diameter of cylindrical parts during the machining thereof

A measuring arrangement, in particular in a machine tool, for interrupting the machining operation on a cylindrical part when such part has attained a predetermined diameter, such arrangement including:

• a head exhibiting an opening provided with two rectilinear ridges positioned in the form of a V and adapted to bear against the part to be machined, said head showing two parallel faces substantially perpendicular to the axis of the part to be machined, said parallel faces defining the thickness of the head,
• a sensor mounted on such head and arranged along the bisector of the angle formed by the two ridges, said sensor furnishing a signal representative of the diameter of the cylindrical part, the head being oriented relative to the part to be machined in a manner such that said bisector is situated in a plane substantially parallel to the horizontal,
• means coupling the head to a base fixed to the machine frame in order to assure contact of said ridges with the cylindrical part during the machining operation, said coupling means being arranged so as to assure the mobility and the retention of the head in a plane X-Y substantially perpendicular to the axis of the cylindrical part to be machined,
• elastic urging means urging the head against the part to be machined, and
• elastic sustaining means for sustaining the head with its coupling means on the base fixed to said machine frame, said sensor, said coupling means, said elastic urging means, and said elastic sustaining means all being located within a space bounded by the extension of said two parallel faces defining the thickness of the head.