end of the crown 19 to close the ends of the box beam and to prevent the introduction of foreign matter to the interior of the beam each corner post houses a vertical tie bar 25 best seen in fig2 that extends from the base of the press and extends out of the top plate 21 of the crown a tie bar nut 27 is threaded onto the top of each tie bar 25 to secure the crown 19 of the press to the respective corner post 18 the tie bar nuts 27 are tightened to preload the corner posts 18 with a combined preload force that is greater than the largest force that will normally be exerted by the press on a workpiece an electric motor 30 that is used to drive the press is mounted on a support plate 32 that is cantilevered from a spacer block 33 the spacer block 33 is positioned in the middle of the crown 19 equally spaced from the two tie bar nuts 27 a mounting bracket 35 is attached to the cantilevered end of the support plate 32 remote from the spacer block 33 and a displacement transducer 36 such as a linear variable differential.