On 9/5/2017 10:21 AM, micky wrote:
>
> What good is a jackpad with a slot if the slot is not deeper than the
> thing it holds? Isn't the idea that the weld area fits completely in
> the slot and the car is supported on either side of the slot?
>
>
> I accidentally came across a jack pad with a slot in it, so the weld
> line on unibody cars doesn't hold the weight of the car when you jack it
> up. And that's when I realized a) I need that, b) the jack that came
> with the car has a slot, but if I jack it up at home I use a better jack
> with no slot, c) there is already damage from people before me jacking
> it up, and d) the drain holes in the fender could be damaged if I were
> stupid enough to put the jack there.
>
> But...... the slots range from 1/4 inch to 0.63 inches, and my pinch
> weld is almost an inch high on the outside and higher yet on the inside.
>
> What good is that?
>

I would think that they want the jack to be lifting on the welded rib
because that is where the most stiffness is to spread the weight out
over more of the frame, rather that putting the weight on the flat
surface that can then dent in. Once it dents, its strength goes away,
like denting the side of a beer can when trying to squash it from the end.