The cutting width of your cutter/guillotine should always be more than the longest dimension of your maximum sheet/printing size. The longest dimension is the diagonal length. So with format 75 x 105cm. the diagonal is 129cm. which is turned easily under the knife of the 137 cutter. With the 115 cutter, the pile of material has to be pulled forward and turned on the front table. N.B. The Polar 92cm. cutter would allow format 52 x 72cm (diagonal = 88cm) to be turned under the knife.However, most modern printing presses have 120cm. pile height at the delivery. So the Polar 115 with 15cm. clamp opening would be better than the 92cm. cutter with 10cm. clamp - i.e. eight loads of 15cm. on the 115 vs. twelve loads of 10cm. on the 92. The operator loads the cutter less times.
Yes that is correct. That is the reason for having the 78 and 92 for the B2 sheet size 50 x 70 cm (diagonal 88 cm) and the 115 and 137 for the B1 sheet size 70 x 100 cm (diagonal 122 cm). The smaller cutter will do the job but the larger one would give you a lot more productivity by enabelling you to turn the sheets underneath the knife without pulling it onto the front table. To calculate the diagonal for your individual sheet size you can simply use this formula √a² + b².
