Fig. 8 shows a jig used to drill holes at the same position on multiple identical wooden components. The machine is commonly found in school and industrial ...

(a) A jig is a device that holds and locates the workpiece and guides the cutting tool (such as a drill bit) to ensure each component is manufactured identically. [1] It combines workholding and tool guidance in a single fixture, so the operator does not need to measure, mark out, or align each piece individually. The jig shown has guide holes through which the drill bit passes, ensuring holes are drilled in the same position on every workpiece.

(b) One advantage of using a jig for batch production: [1]

It ensures accuracy and consistency because all holes are drilled in the same position on every component without the need for individual marking out. This saves time (no measuring or marking per piece), reduces the skill level required of the operator, and virtually eliminates positional errors across the entire batch.

(c) The part labelled 'stop' is an end stop (also called a location stop). Its function is to position each workpiece in exactly the same location within the jig before the operation begins. [1] The operator pushes the workpiece against the stop, guaranteeing that every piece is registered in the same position relative to the guide holes. Without the stop, each workpiece could shift to a slightly different position, causing the drilled holes to be inconsistently located from piece to piece.