FIELD: transport engineering; automotive industry. SUBSTANCE: roll-out truck frame of assembly-and-welding jig is installed in turned-over position onto checking plate of three-axis checking machine, preliminary checking of frame is carried out and checking members are installed by which output to used coordinate system is provided and then nonplaneness of frame in fixed points is checked, and jig members (jig plates, posts and working blocks) are set and checked relative to checking members to provide spatial position of jig, and jig plate, posts and blocks simulating theoretical surfaces of body are set and checked out. EFFECT: reduced costs of preparation for production, enhanced accuracy of jig adjusting with compensation for machining errors of jig parts, reduced labour input at assembling. 3 cl, 13 dwg
