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Multi-depth Profiles
There are several reasons for making
multiple passes with edge forming, profile
cutters.
► For large profiles, a shallow first-pass
can be made to remove the bulk of the
material.
► Several shallow passes can be made for
better control with large router bits.
► A final, shallow, clean-up pass can
improve the quality of the finished edge.
Multi-position (horizontal) Profiles
Altering the horizontal position of a router
cut for multiple passes is required
whenever the profile cuts back into the
workpiece in a way that changing the
depth would destroy the desired profile. A
common example of this is a slot cutter. A
common problem with this type of cutter is
that sharp corners between the cut profile
and the uncut wood edge will tend to tear
out. This can be reduced by making a very
shallow scoring cut before making a full
profile cut.
Pre-cutting Dovetails and Keyways
Dovetail and keyway cutters are inherently weak
because the upper shank of the bit is smaller
than the cutting edges. If the stress on the bit is
too great, the cutting tip can break. To reduce
the stress on the cutter, it is common practice to
plough out the majority of the material with a
straight bit. The depth of the straight bit should
be slightly shallower than the depth of the final
bit so the bottom of the profile remains square.
Supplemental User’s Manual 15