Edging With A Pilot Bit - Craftsman 320.28212 Operator's Manual

EDGING WITH A PILOT BIT (Figs. 12 and 12a)
Arbor-type bits with pilots are
excellent for edge shaping
any workpiece edge that is
straight or is curved with a
curvature that is equal to
or greater than the radius
of the bit that is used. The
pilot prevents the bit from
making a cut that is too deep;
holding the pilot firmly in
contact with the workpiece
edge throughout the cutting
process prevents the cut from
becoming too shallow.
Fig. 12
TOP EDGE SHAPING
Motor housing
Workpiece
Top Edge of Workpiece
When the workpiece thickness
and the desired depth of cut are
such that only the top part of the
edge is to be shaped, leaving
at least a 1/16-in. thick uncut
portion below, the pilot can ride
against the uncut portion of the
workpiece. (See Fig. 12.)
Fig. 12a
If the workpiece is too thin or
the bit is set so low so that
\ ,
there will be no uncut edge WHOLE EDGE SHAPING GuideBoard
against which to ride the pilot,
an extra board must be placed
Whole Edge of
Workpiece
under the workpiece to act
as a guide (see Fig. 12a). This
"guide" board must have exactly the same contour as the workpiece edge. If it is
positioned so that its edge is flush with the workpiece edge, the bit will make a
full cut. If the guide board is positioned as shown in Fig. 16a (extending beyond
the workpiece edge), the bit will make less than a full cut, altering the shape of
the finished edge.
_, WARNING: Always securely clamp the workpiece in place, and keep a firm
grip on the router base with both hands at all times. Failure to do so could result
in loss of control causing possibly serious personal injury.
28212 Manual_Revised_07-0713 Page 25