The following principles should be considered for design of jigs/ fixtures
1.Rigidity: jigs/ fixtures should be sufficiently stiff/rigid to achieve required accuracy during machining.
2.Fool proofing: The fool proofing or mistake avoiding system should be provided so that no human error may occur during use of jigs/ fixtures.
3.Easy clamping/de clamping : The component should be easily clamped/de clamped during positioning the component.
4.Simplicity in design: The design should simple and easy for use and manufacturing. It reduces cost of jigs/ fixtures.
5. Easy ejection of component: Ejectors should be provided to remove the component after machining using suitable ejector mechanism.
6.Design for safety: Safe and convenient for use. Minimum chances of accidents, avoid sharp corners, projected parts like bolts,etc
7. Locating points : Good facilities should be provided for locating the work. The position of work piece should be accurate with use of locating points.
8.Economical: The cost and benefits should be considered and design of jigs/ fixtures Should be simple so that its manufacturing should be economical.
9.Easy visibility for operator : During machining operator can easily observe the process and work piece without any obstruction or movement of body unnaturally.
10.Burr grooves: The burr or clearance grooves should be provided for easy removal of metal chips, burrs after machining