a) General rules for designing Compare the cost of production of work with present tools with the expected cost of production, using the tool to be made and see that the cost of buildings is not in excess of expected gain. Decide upon locating points and outline clamping arrangement. Make all clamping and binding devices as quick acting as possible. Make the jig fool proof Make some locating points adjustable Avoid complicated clamping arrangementsRound all corners Provide handles wherever these will make handling easy Provide abundant clearance Provide holes on escapes for chips Locate clamps so that they will be in best position to resist the pressure of the cutting tool when at work Place all clamps as nearly as possible opposite some bearing point of the work to avoid springing action Before using in the shop, test all jigs as soon as made
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