Materials, installation ways and flanges for woodworking circular saws (hereinafter referred to as the circular saw) shall meet the following provisions.:
1. Materials shall comply with the specifications in attachment table 5 or other equivalents or more mechanical properties depending on the type of circular saw blades and their components.
2. Mounting:
(1) Using the flange set in subparagraph 3, except a gang rip or a multiple sizer that uses special assembly tools.
(2) fixed- or movable- flange being fixed on a saw shaft in a shrink fit, press or the like, or with pins, bolts.
(3) The fastening bolts on the shaft of the circular saw shall be of an appropriate tightness.
(4) Nuts, bolts and others for fastening the flange must be capable of preventing loosening while the saws are being braked.
3. Flange:
(1) Uses material that has a tensile strength of FC150 iron castings set in the national standard CNS 2472 “gray iron castings,” and not causing deformation.
(2) Flange diameters being equal on the fixed- side and the movable- side.

• Attachment table 5.pdf
• Attachment table 5.doc

The circular saw shall have the following safety devices:
1. An anti-kickback device for the circular saw (hereinafter referred to as the anti-kickback device) except the cross cut circular saw or others not causing danger to workers because of wood kickback.
2. A teeth contact-preventive device for the circular saw (hereinafter referred to as the teeth contact-preventive device) except that for lumber or with an automatic feeding device.

A riving knife of the anti-kickback device (hereinafter referred to as the riving knife) or a teeth-contact preventive device shall meet the following provisions:
1. The installation of the riving knife and the teeth contactpreventive device must be in the condition that the longitudinal cross section plane formed by their longitudinal cross section planes containing their longitudinal center lines and the longitudinal cross section plan containing the longitudinal center line of the blade are always on the same plan.
2. The gap between the riving knife and the top of that opposite blade teeth is less than 12 millimeters.

When the power blocked, the circular saw shall have a brake device to make its rotating shaft stopped except the following circular saw:
1. The circular saw is capable of stopping its shaft within 10 seconds when the power blocked.
2. The portable circular saw use a single-phase series wound motor.
3. The circular saw has an automatic feeder which blade is built into the body or others that do not cause a dangerous risk because of bodily contact.
4. It is a tenoning machine or a multi-axis tenoning machine.

The circular saw shall have a device to fix its shaft to prevent the hazard from shaft rotating when replacing the blade.

The power blocking device for the circular saw shall meet the following provisions:
1. Setting in a place that the operator can control it without leaving the operating position.
2. Being easily to control and having a construction that no risk of unexpectedly starting when accidently contacting or vibrating and so forth.

Blades, gears, pulleys, belts and other rotating parts of circular saws those have a dangerous risk because of bodily contacting shall have covers except the necessary cut portion by the blade.

A tilt device of the table of an universal tilt circular saw shall be a spiral type or a structure not to cause an accident tilting.

The portable circular saw shall provide a surface plate. The distance between the outer end of the surface plate in cutting side and the teeth top of the blade shall be over12 millimeters.

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.pdf
• Attachment table 6.doc
• Attachment table 7.pdf
• Attachment table 7.doc
• Attachment table 8.pdf
• Attachment table 8.doc

An anti-kickback preventive claw for an anti-kickback device (hereinafter referred to as the anti-kickback preventive claw) or an anti-kickback preventive roll (hereinafter referred to as the anti-kickback preventive roll) shall meet the following provisions:
1. Material : It is in accordance with the SS400 set the national standard CNS 2473 " the general- structure-using rolled steel " or the equivalent or others having more mechanical properties.
2. Construction:
(1) The anti-kickback preventive claw or the anti-kickback preventive roll shall have the function to prevent processing material from lifting on the slope tooth side of the blade and be enough strength based on the wood-piece thickness but it is unrestricted for the anti-back preventive claw with an automatic feed device.
(2) For the anti-back preventive claw with an automatic feed device, it shall have function to prevent processing material kickback and be enough strength based on the wood-piece thickness.
3. The support of the anti-back preventive claw or the anti-kickback preventive roll shall have sufficient strength against the processing material bounce.
4. Except the circular saw with an automatic feed device, the anti-kickback preventive device with the diameter over 450 millimeters shall use that neither the anti-kickback preventive claw nor the anti-kickback preventive roll.

The teeth-contact preventive device for the circular saw shall meet the following provisions:
1. Construction:
(1) Except the teeth-contact preventive device for a portable circular saw, a cover that lower-end always contacts with fed wood-piece in the teeth-contact preventive device (hereinafter referred to as the movable teeth-contact preventive device) shall have a construction being capable of guarding all excluding the teeth opposite the riving knife and the cutting portion of the wood-piece.
(2) Except the teeth opposite the riving knife and the portion of 8 millimeters above the top of feeding wood-piece, the cover being not a movable teeth-contact preventive device shall have a construction to guard all and cannot let the lower-end of the cover be adjusted over 25 millimeters above the saw table surface to intend use it.
(3) The cover in the preceding two subparagraphs shall have a construction that the operator who is feeding the wood-piece can see the cutting portion of the saw blade.
2. Bolts, pins and others for the hinge portion of the cover related in the preceding subparagraph shall have function to prevent loosening.
3. The support portion of the teeth-contact preventive device have the construction to adjust the cover position and enough strength to support the cover. Preventing loosing or dropping out shall be applied to the shaft and bolts of the support portion.
4. The teeth- contact preventive device for the portable circular saw:
(1) The cover: It has the construction to guard the portion except the cutting necessary portion. In the state, the necessary sizes for the saw blade cutting shall be not over the value in Attachment figure 1 when the surface plate is adjusted to the most cutting depth and the angle between the surface plate and the saw blade is 90 degrees.
(2) Fixed-cover: It has a construction to let the operator see the cutting portion.
(3) Movable cover:
a. When cutting work is finished, it comes back to the closure point automatically.
b. It cannot be fixed at any position in the movement range.
(4) The support portion: It has sufficient strength to support the cover.
(5) Preventing loosing or dropping out shall be applied to the bolts in the support portion and the bolts to fix metal fittings of the springs in the movable automatically return cover.

• Attachment figure 1.PDF
• Attachment figure 1.doc