Sash trimmers are a foot-operated machine used to cope the ends of sash bars that frame in at oblique angles. The angles are infinitely adjustable from 0-90 degrees. The machine is indispensable for sash that have diagonal bars such as the Corner Drugstore Sash Project in Leavenworth, Kansas. As seen in the photo above, Heald sash trimmer coping end of sash bar.