Abstract: Proceed from the needs of plane grinder CAD, two advanced techniques are studied. "Removing toy bricks" mechanics model is presented. Through the solver of the model and optimization of the parameters, volume optimization and stiffness optimization of grinder spindle is realized. New variational design method-variation reasoning is presented. On the basis of building variational design model automatically, a new design graph can be obtained automatically when dimension driven. It is specially applicable to optimizing design, modifying design and series design. The results studied possess generic significance.

Key words: Optimizing design, Plane grinder, Spindle, Variational design