ROUTER PREPARATION
18
Chapter 7 Super Jig-12-18-24 User Guide
7-6 Depth of cut is not the distance the bit projects from the
router base. This is bit projection
. This user guide generally
refers to depth of cut. Bit projection
is always .500"[12,7mm]
more than depth of cut.
2
7-7
Ideally, the router collet (and bit) should be concentric (cen-
tered) to the guidebush as in figure 7-5. Regrettably, this is often not
the case; the bit can be off center (eccentric to) the guidebush
. The
illustration shows the problem highly exaggerated. The good news:
bit to bush alignment doesn’t affect joint fit or flushness; both are
“adjusted out” in normal jig setup.
1
7-8 Bit to guidebush offset may change when the router motor is
unclamped from the base when changing bits or making bit height
adjustments.
Concentricity problems can also arise if two routers are
used for through dovetails, (one for pins; one for tails). Routers with
different bit to guidebush offsets
(misalignment shown highly
exaggerated)…
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7-9
…will cause pin to tailboard
misalignment (again, shown
highly exaggerated).
Fortunately, some newer routers have sub-bases that can adjust
for concentricity. If you don’t have this type, it might pay to stick
to a single router for through dovetails.
■
3
3
7-5 Depth of Cut: The depth of cut always refers to the actual
depth
of the cut into the wood beneath the guidefingers
.
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