Springs... what do they do?

This is more of a question of curiosity opposed to an issue, but can anyone explain the purpose of the springs on the shapeoko?

My understanding is they are they to provide general upforce on the Z axis - that said it doesn’t seem enough to do much unless the router is at the lower end of the axis?

The springs prevent the spindle mount from dropping to the wasteboard and snapping off endmills or a spinning endmill making a gouge in raw material or a finished piece.

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That makes sense - Thanks