Abstract: A spar assembly jig for tack-free positioning of aircraft spar components for subsequent fastening at a second location. Pneumatically operated clamps are mounted on the frame of such jig. The spar components are laid up in such jig and the clamp closed thereon to hold the members together as opposed to the prior art method of securing such components together by temporary fasteners or tacking. The assembly jig and so-assembled and clamped spar components are then transported by overhead crane to an automatic riveting machine. The riveting machine has a jaw defined by a spindle and anvil which fits above and below the jig assembly. The clamps have a swing-away feature such that as the spindle and anvil approach, the clamp swings out of the way so that such machine can drive a rivet through endcap and web at or near the spot vacated by the swing-away clamp. The machine then moves on and the clamp re-closes on the spar components.

Abstract: A spar assembly jig for tack-free positioning of aircraft spar components for subsequent fastening at a second location is provided. Pneumatically operated clamps are mounted on the frame of such jig. The spar components are laid up in such jig and the clamps closed thereon to hold the members together as opposed to the prior art method of securing such components together by temporary fasteners or tacking. The assembly jig and so-assembled and clamped spar components are than transported by overhead crane to an automatic riveting machine. The jig and spar components are lowered into place before such riveting machine, which has a jaw defined by a spindle and anvil which fits above and below the jig assembly. The clamps have a swing-away feature such that as the spindle and anvil approach eg.