High precision spindle assembly, and method of forming same

The method of forming a spindle assembly, comprising the steps of:

• providing a body having an opening into which said spindle is to be mounted;
• providing a tubular main spindle part having a first abutment surface;
• inserting said main spindle part into said body opening;
• providing a bearing having an inner race and an outer race;
• positioning said bearing between said main spindle part and said body;
• providing a retaining nut having a second abutment surface;
• mounting said retaining nut on said body so as to compress said bearing between said first and second abutment surfaces;
• providing a retaining nut;
• mounting said retaining nut on said main spindle part so as to form therewith an assembled spindle;
• rotating said assembled spindle relative to said head;
• and
• grinding a frusto-conical surface on said retaining nut;
• thereby to form a frusto-conical surface on said retaining nut that is concentric with the rotational axis defined by said bearing.