Answer:
ØA Jig Is A Device That Locates And Holds The Work Piece.
ØIt Also Guides And Controls One Or More Cutting Tools.
ØSmall Jig Are Not Usually Clamped To The Machine .ØØFor Holes Above 6mm Jigs Are Usually Clamped .
ØJigs Are Fitted With Hardened Steel Bushing For Guiding Drills Or Other Tools .
Jigs are used to support & hold the work piece and guide the cutting tool while Fixture is used to support and Hold the Workpiece.Generally milling work fixtures are used and for drilling work jigs are used.for aircraft assembly Jigs are used to assemble the all components.