The paper presents a method for the synthesis of die four bar spatial mechanism according to die criteria of the pressure angle. This method implies the usage of an utility program with graphic facilities of the MATHCAD or MATLAB type. With its help, one can plot an admissible domain. If the circle described by the extremity othe crank is in the admissible domain, tie pressure angle is smaller than the admissible pressure angle. To fulfil this condition, one should act, by testing, on the mechanism constructive parameters.
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