The design and analysis of complex machining fixtures is difficult. This paper describes software which aids the designer in this task. Using this system, a designer specifies the basic geometry of the fixture in a series of steps. After each step, the designer validates the design using the analysis facilities of the software. The output of this process is a design which satisfies kinematic restraint, total restraint, and tool path clearance requirements. In addition the lower bounds on required clamp actuator intensities are also determined.