Jack Point - Page 3 - Lexus IS Forum
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post #31 of 31 (permalink) Old 07-30-2014, 12:30 AM
Fig
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Originally Posted by blkdout View Post
A normal floor jack would have wheels to compensate for the change in angle, i.e.: it will move/roll with the cars rising angle.

A bottle jack will remain stationary on the floor and push up into the changing angle of the vehicle, thus, bending the weakest point, i.e.: the car is moving up and sideways but the bottle jack is only going straight up.
that is just it, with undersized rollers on rough asphalt the jack remains stationary. Old jacks had huge rollers. Also the jacks angle changes much more than the jack points when rising, that is why the factory scissor jack is a straight rise jack. But the factory jacks work horribly on uneven surfaces as well. Bottom line is that if the load is not square it will fold and there are plenty of circumstance that can cause this.
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