Leigh D4R Pro - Chapter 3 The Leigh Ebush and Optional Guidebushes

9
3-1 The Leigh e7-Bush
➀
is used to rout through, half-blind,
single pass half-blind and sliding dovetails, and also box joints on
the D4R Pro. The elliptical design provides precise joint fit adjust-
ment for box joints and sliding dovetails. A round
7
/16"[11,1mm]
guidebush (min. barrel length
1
/4"[6,35mm])
➁
can be used to
rout through, half-blind, and sliding dovetails on the D4R Pro.
1 2
7
/
16 " [11,1mm]
[6,35mm]
1
/
4 " min.
3-2 The Leigh e7-Bush that comes with your D4R Pro is a
unique template guidebush that is adjustable in size. Unlike regular
circular template guidebushes
➀
, the e7-Bush is slightly elliptical
in cross section
➁
. This simple innovation effectively changes the
guidebush “active diameter size” when it’s rotated, and provides
benefits not possible with a standard round guidebush.
1
2
3-3 The e7-Bush (
7
/16") fits the router base or a guide bush
adaptor in the base (see Appendix I). The ellipse/oval shape has a
major axis
➀
7
/16"[11,1mm], and minor axis
➁
7
/16"[11,1mm] less
.020"[,5mm]. Turning the eBush 90
º
in the router base changes
the active diameter by .020"[,5mm] providing minute adjustment
and recordable settings for perfectly fitting box joints.
1
2
1
2
7
⁄16"[11,1mm]
7
⁄16"[11,1mm] less .020"[,5mm]
3-4 Here’s how it works. In normal use on a dovetail jig, the
operator does not rotate the router more than a few degrees either
way
➀
. In fact, because of potential bit-to-bush eccentricity prob-
lems it is advisable to minimize router rotation on jigs
➁
.
1 2
The Leigh eBush and
Optional Guidebushes
D4R Pro - CHAPTER 3
The guidebush is the vital link between router and jig. All joints created on the D4R Pro are routed with the unique
e7* elliptical guidebush, a Leigh innovation that provides precise joint fit adjustment for box joints and sliding dovetails.
If your router doesn’t accept the e7-Bush, you can use an alternative guidebush with some limitations.
*Supplied with the D4R Pro. U.S. Patent No. 8,256,475. UK Patent No. GB2443974. Canada Patent No. 2,611,232
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The online video will reduce your learning time
dramatically!
Stream to your smart phone or tablet to use in
your shop as a visual reference. Find the video in the Instructional
Videos section of the Support menu at leighjigs.com.
Watch the Online Instructional Video