Ryobi 7-1/4 in. CIRCULAR SAW DOUBLE INSULATED CSB123 - Manual (Page 18)

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OPERATION
0° BEVEL STOP
See Figure 21.
The saw has a 0° bevel stop that has been factory adjusted to
assure 0° angle of the saw blade when making 90° cuts.
To check 0° bevel stop:

Unplug the saw.
 Place the saw in an upside down position on a work-
bench.
 Check the squareness of the saw blade plate to the base
of the saw using a combination square.
To adjust 0° bevel stop:

Unplug the circular saw.
 Loosen bevel adjustment knob.
 Loosen hex nut securing adjusting screw.
 Turn adjusting screw and adjust base until square with
saw blade.
 Tighten hex nut and bevel adjustment knob securely.
WARNING:
Attempting a bevel cut without having the bevel
adjustment knob securely tightened can result in seri-
ous injury.
LENGTH OF CUT SCALE
See Figure 22.
The saw is equipped with a length of cut scale on its base.
It is parallel with the saw blade and can be used to measure
the distance into the material the blade cuts.
NOTE: Six inches is the maximum length of cut that you can
measure. Also, it is accurate only when the depth of cut is
set at full maximum depth. Fig. 1
BEvEL
ADJUSTMENT
KNOB
COMBINATION
SQUARE
ADJUSTING
SCREW
Fig. 
LENGTH OF CUT SCALE
HEx NUT