INCRA Jig - Manual (Page 6)

6
Grooving, dadoing, rabbeting and edge forming.
Box joints, dovetails and the exotic INCRA Double and Double-Double joinery may be the icing on the
cake, but everyday cutting applications such as grooving, dadoing, rabbeting and edge forming are the
real bread and butter benefits of owning an INCRA Jig. Each of these common cutting operations requires
a different way of calibrating the fence to the
cutter. For grooving and dadoing, you will
typically zero the fence to the INSIDE edge
of the router bit. For rabbeting, you will zero
the fence to the OUTSIDE edge of the bit.
And for edge forming, you will often add a
pair of sub fences to accommodate the
larger diameter of most edge forming bits.
A quick look at the illustrations below will
show how you can quickly and easily
calibrate your INCRA Jig for each of these
types of cuts.
Applications - Common Cuts
Fig. 22 Edge forming
First: Lock upper body at 0”
Second: loosen clamps and
slide base panel forward
towards the cutter
Third: While continuing to nudge
the base panel forward, sight
along the fence until the gap of
light between the fence and the
cutter disappears.
Fourth: Re-tighten the base
panel clamps. The fence is
now zeroed to the inside edge
of the cutter
Fig. 19A
Fig. 19
Zeroing for grooving and dadoing
Fig. 21 Zeroing for rabbeting
First: Lock upper
body at 0”
Fig. 18 Grooving and dadoing
Fig. 20 Rabbeting
Fig. 23 Zeroing for edge forming
Third: Hold straight-edge
against fence
Fourth: Tap base panel
backward until cutter “kisses”
the straight-edge
Fifth: Re-tighten the base panel clamps.
The fence is now zeroed to the outside
edge of the cutter
First: Lock upper
body at 0”
Second: Loosen clamps and slide base panel
forward until the fence covers the cutter
When setting up for most common cutting
operations, the first step us usually to set
the INCRA Jig to a reading of zero, as
shown in Fig. 19A. The base panel is
then moved forward until the fence is
“zeroed” to the desired edge of the bit.
Second: Loosen clamps and slide base panel
forward until sub fences cover the cutter
Fourth: Tap base panel
backward until bearing
touches straight-edge
Fifth: Re-tighten the base panel
clamps. The fence is now zeroed to
the cutter bearing
Third: Hold straight-edge
against fence at level of
cutter bearing