when operator want to cut much more thin sheet,it needs to agjust the shearing machine blade angle.otherwise,you can not cut enough wide,because another side is too high.that is to say that the two points of knife never together.then,the problem is how to handle this thing. we have place a manual handle or electric button to control this step.you can find the handle in the front of guillotine shearing machine.it is more suitable compared to swing beam shear.