Porter-Cable PCB270TS ユーザーズマニュアル

–  6  – 

ASSEMBLY AND RIVING KNIFE
Your table saw is equipped with a blade guard assembly, 

anti-kickback assembly and riving knife that covers the 

blade and reduces the possibility of accidental blade 

contact. The riving knife is a flat plate that fits into the cut 

made by the saw blade and effectively fights kickback 

by lessening the tendency of the blade to bind in the cut. 

The blade guard assembly and anti-kickback assembly 

can only be used when making through cuts that sever 

the wood. When making rabbets and other cuts that 

make non through cuts, the blade guard assembly and 

anti-kickback assembly must be removed and riving 

knife lowered to the non through cut position marked on 

the riving knife. Two anti-kickback pawls are located on 

the sides of the riving knife that allow the wood to pass

through the blade in the cutting direction but reduce 

the possibility of the material being thrown backwards 

toward the operator. Use all components of the guarding 

system (blade guard assembly, riving knife and anti-

kickback assembly) for every operation for which they 

can be used including all through cutting. If you elect 

not to use any of these components for a particular 

application exercise additional caution regarding control 

of the workpiece, the use of push sticks, the position of

your hands relative to the blade, the use of safety 

glasses, the means to avoid kickback and all other 

warnings contained in this manual and on the saw itself. 

Replace the guarding systems as soon as you return to 

thru-cutting operations. Keep the guard assembly

in working order.

KICKBACKS
KICKBACKS: Kickbacks can cause serious injury. A 

kickback occurs when a part of the workpiece binds 

between the saw blade and the rip fence, or other fixed 

object, and rises from the table and is thrown toward the 

operator. Kickbacks can be avoided by attention to

the following conditions.

How to Avoid Them and Protect Yourself from Possible 

Injury:

a. Be certain that the rip fence is parallel to the saw blade.

b. Do not rip by applying the feed force to the section of 

the workpiece that will become the cut-off (free) piece. 

Feed force when ripping should always be applied 

between the saw blade and the fence; use a push 

stick for narrow work, 6 in. (152 mm) wide or less.

c.  Keep saw blade guard assembly, riving knife and anti-

kickback assembly in place and operating properly. 

If anti-kickback assembly is not operational, return 

your unit to the nearest authorized service center for 

repair. The riving knife must be in alignment with the 

saw blade and the anti-kickback assembly must stop a 

kickback once it has started. Check their action before 

ripping by pushing the wood under the antikickback 

assembly. The teeth must prevent the wood from 

being pulled toward the front of the saw.

d.  Plastic and composite (like hardboard) materials may 

be cut on your saw. However, since these are usually 

quite hard and slippery, the anti-kickback pawls may 

not stop a kickback. Therefore, be especially attentive 

to following proper set up and cutting procedures for 

ripping.

e.  Use saw blade guard assembly, anti-kickback 

assembly and riving knife for every operation for which 

it can be used, including all through-sawing.

f.   Push the workpiece past the saw blade prior to 

release.

g.  Never rip a workpiece that is twisted or warped, or 

does not have a straight edge to guide along the 

fence.

h.  Never saw a large workpiece that cannot be controlled.

i.   Never use the fence as a guide or length stop when 

crosscutting.

j.   Never saw a workpiece with loose knots, flaws, nails 

or other foreign objects.

k.  Never rip a workpiece shorter than 10 in. (254 mm).

l.   NEVER use a dull blade – replace or have 

resharpened.

m.  NEVER use a rip fence and miter gauge together.

n.  Keep hands out of saw blade.