RIDGID R4121 Operator's Manual page 33

OPERATION
CUTTING WARPED MATERIAL
See Figures 40 - 41.
When cutting warped material, always make sure it is
positioned on the miter table with the convex side against
the fence as shown in figure 40.
If the warped material is positioned the wrong way as shown
in figure 40, it will pinch the blade near the completion of
the cut.
RIGHT
WARNING:
To avoid kickback and serious personal injury,
never position the concave edge of bowed or
warped material against the fence.
Fig. 40
33
WRONG
Fig. 41