果树手锯新锉法图二新锉法图一常规锉法修剪果树用的手锯用一段时间就会发钝，对锯齿应用钢锉打磨锉伐。常规锉伐方法均左右排锯齿隔一顺排向锉成三角形，即将一齿打磨成两个对应斜面（见图一）。此法打磨的齿尖近似三棱形，这样运用起来锯齿易钝，且费力。笔者凭多年的经... Figure of a new file of fruit tree hand saw Figure II of the new file method A conventional file method Pruning fruit trees with hand saws will be blunt for some time, the application of serrated tooth file grinding file cutting. Routine methods of filing are left and right rows of serrated teeth in a file into a triangle, the tooth is polished into two corresponding bevel (see Figure 1). This method of grinding the tip nearly triangular shape, so that the use of serrated blunt, and laborious. The author with many years of experience ...