解释可编程前规与后规的优点。改造现有剪切机与购买带有可编程前端计量的新剪切机，以及节约成本来证明额外成本的合理性。

EXPLANATION OF THE BENEFITS OF PROGRAMMABLE FRONT GAUGING VERSUS BACKGAUGING. CONVERTING AN EXISTING SHEAR VERSUS BUYING A NEW SHEAR WITH PROGRAMMABLE FRONT GAUGING AND WHERE THE SAVINGS COME FROM TO JUSTIFY THE ADDITIONAL COST.