In transfer and unit machine design, the head stock processing craft is a key. "A three charts card" including processing components working procedure chart, processing schematic drawing，engine bed assembly drawing, production efficiency computation card. Processing components working procedure chart is expressed a aggre gate machine-tool to is processed the craft content schematic drawing which the components should complete. It including processing spot sizeprecision, content and so on surface roughness and specification. The processing schematic drawing indicated is processed the components in the engine bed processing process, the cutting tool, auxiliary position condition, work piece and jig, position relations engine bed various spare parts and so on between cutting tool, as well as engine bed power stroke and operating cycle and so on. The engine bed assembly drawing expressed the engine bed each composition part mutually coordinates the relations and various components, the part, the standard letter, General Work piece and so on the name, the code number, the quantity and the movement relations. Examines various parts between the relative position and the size relates whether satisfies the processing request, the general part is whether appropriate and so on the content.
Key words: transfer；unit machine Head stock； "a three charts card"
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