This International Standard specifies dimensions relating to the interchangeability of the following types of spindle unit used in special purpose machines constructed from modular units :
— Quill feed (self-feeding) single spindle drilling units (clause 4);
— Quill feed (self-feeding) single spindle drilling units with adjusting slide for tool changing (clause 5);
— Single spindle drilling units (clause 6);
— Single spindle milling units (clause 7);
— Single spindle facing and boring units (clause 8).