Fool proofing:

It can be defined as “the incorporation of design feature in the jig or fixture that will make it possible to lead the work into jig and fixture, in an improper position, but will not interfere with loading and unloading the work piece.” There are many fool proofing devices, such as fooling pegs, blocks or pins which clears correctly position parts but prevent incorrectly loaded parts from entering the jig and fixture body

• The location system should positively prevent the wrong loading of the workpiece in a fixture by fool proofing
• The workpiece shown in fig is to be located from holes A and C.
• As holes B and C are equidistant from A and their size is also the same, there is a risk of the workpiece being wrongly loaded as shown by the chain of dotted line
• This wrong loading can be prevented by providing a fool proofing pin which would obstruct the path of the workpiece if in case it is loaded wrongly
• It would be impossible to load the workpiece wrongly due to a fool proofing pin.

Swarf clearance

Large quantities of metal chips are produced in a high production metal working plant. By continuous removal of the chips the productivity of the plant can be improved considerably, because the machine tool operator does not waste his time removing the chips he produces as a by-product.

An economical removal system for chips and recovery of cutting fluids does, however, require tailor-made systems.

The chips are collected and conveyed away from the machine tools by means of specially adapted conveyors.

• Bushy swarf is crushed to short chips. Wet chips are centrifuged and cutting fluids recovered and cleaned.
• The process should be continuous and requires a minimum of manual work. The solution for efficient and economical chip handling will vary depending on the workpiece and the nature of job, chip volume and the properties of the chips.
• Jigs and Fixtures can be ergonomically designed such that the swarf excreted out can fall of in a tray or any conveyor drive and can be removed without the intervention of an operator