The present invention aims to produce a cold-rolled metal coated multi-phase steel, characterized by a tensile strength of at least 500 MPa, a yield ratio lower than 0. The BEMF spindle speed control is used to calibrate a reference time period representing an accumulation of a predetermined number of wedge-to-wedge times. Each rail section has at least one pivotable flap 19 engageable by the carriage 16 as it moves along the rail. The display allows for a dual representation employing multiple pointers, with one pointer dedicated to a dial-based display, and another pointer dedicated to a bar graph display. An electric motor drives the translatable nuts fore and aft, and a fail-safe device that includes a motor control switch operated by the fore and aft movements of two of the nuts limits misalignment of the two pedals due to adjustments.