To ensure the simplicity of blade arrangement and on-site production operability of the longitudinal cutting machine, this method is generally used for on-site longitudinal cutting debugging, except for special structural production lines (leveling machines without support rollers). The total length of the blade shaft of the longitudinal cutting machine is generally about 200 millimeters longer than the widest sheet metal required by the customer. The method for aligning the longitudinal cutting machine benchmark is as follows: 1. Use the longitudinal cutting machine benchmark of over 100 millimeters as the first blade of the mother blade as the benchmark to start cutting. The width of the first blade spacer of the public knife is 100mm+blade thickness+selected blade side clearance (unilateral clearance). 2. According to the inconsistency of the upper and lower blade axis benchmarks of the longitudinal cutting machine, the benchmark needs to be repeatedly aligned. The alignment method is as follows: first, perform the first cutting according to the theoretical calculation value, and after the cutting is completed, check the jumping of the upper and lower benchmark blades. If the runout is higher than the reference section runout, it is necessary to investigate the cause (such as the deviation of the reference end face runout, the deviation of the spacer parallelism, the deviation of the blade runout, dust, etc.). After eliminating the cause, the theoretical first blade runout should not exceed 0.01mm3, and the gap between the upper and lower blades on the descending blade axis should be about 0.5 millimeters. First, visually check whether there is a side gap between the blades. If there is a side gap, continue to descend the upper axis until the blades overlap by 1-2 millimeters. Measure the side gap between the reference blades, and the error between the measured gap and the selected gap is the error between the upper and lower blade axis benchmarks. Adjust the thickness of the spacer between the first set of male blades and the benchmark to ensure that the measured gap overlaps with the selected gap. Then, the longitudinal shear machine benchmark Zhao. If the blade has no side clearance before adjustment, in order to prevent the blade from biting, it is strictly prohibited for the blade to fall and overlap. Adjust the thickness of the spacer until the gap is appropriate. 4. Once the benchmark of the slitting machine is adjusted, there are no special requirements in the subsequent production process, and the benchmark does not need to be changed. If the blade clearance is changed, it can be adjusted by replacing the spacer or adjusting the paper cushion. 5. After the benchmark is selected, a benchmark line is set at the position of the roll body of the unwinding machine, rewinding machine, etc. Regardless of any changes in the width of the customer's winding, all steel coil winding positions are based on the benchmark& nbsp; & nbsp; & nbsp;& nbsp; As the baseline.