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Originally Posted by Lee Stewart
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I like this one, too.
You can see the frames start out upside down, to allow gravity to help when installing the front crossmember/suspension and rear axle.
One other result is that the grease pencil markings on the frame are written in this condition and therefore appear upside down when viewed on a complete vehicle.
Frame turn-over is an interesting operation. Pontiac Michigan had an elaborate fixture that would grab the frame from the side and lift it up and over, landing it on the next conveyor in the upright position. (Pretty sure that is what we are seeing here; the light colored mechanism in the foreground hooks in the flange of the frame rail).
In Flint, the frames were hanging from chains, and so the turnover operation consisted of simply picking up one side with an air hoist, lifting it over center and letting it free fall the rest of the way. The frames danced around a bit when they slammed down so you wanted to give those guys a lot of extra space.
K