The riving knife shall meet the following provisions:1. Materials: complying with SK5 specifications set in the national standard CNS 2964 "carbon tool steel " or other equivalent or more mechanical properties.2. Shapes:(1) A shape of the riving knife is formed to comply a gap within 12 millimeters to two third of the slope teeth of the blade related to the standard table surface in accordance with Article 116.(2) The cross section shape of the riving knife shall be the form that resistance is less to feed the wood-piece.3. Being related to the standard table position based on Article 116, the width of a riving knife with one end fixed (hereinafter referred to as the sickle-type riving knife) shall be in accordance with the diameter of the blade and not less than the value in Attachment table 6.4. The width of the sickle-type riving knife in a two-thirds position of the blade reverse teeth from the standard table position is not less than one third of the value in Attachment table 6.5. The width of the drape-type riving knife fixed at both ends (hereinafter referred to as the drape-type riving knife) shall be in accordance with the diameter of the blade and not less than the value in Attachment table 7.6. The thickness of the riving knife shall be more than 1.1 times of that of the blade.7. The mounting portion has a structure to adjust the gap between the blade and the riving knife.8. Mounting bolts:(1) The material shall be steel. The diameter of bolts shall be according to the type of the riving knife and the diameter of the blade and not less than the values in Attachment table 8.(2) Numbers of mounting bolts shall be over two.(3) The mounting bolts shall use conical spring washers to prevent loosening.9. Materials of support parts shall be steel or cast iron and have sufficient strength to support the riving knife.10. The riving knife for the circular saw with the diameter over 610 millimeters shall be a drape-type.Attachment table 6.pdfAttachment table 6.docAttachment table 7.pdfAttachment table 7.docAttachment table 8.pdfAttachment table 8.doc