Leigh D4R Pro - Half-Blind Dovetail Bit Selection

75
BIT SELECTION
Appendix IID4R Pro User Guide
1
2
3
B
Pin Board
Tail Board
Bits:
The same dovetail bit routs both
parts of a half-blind dovetail.
Flush Drawers:
The dovetail bit’s working depth
of cut
B
must be less than the
pin board thickness
➀
for flush
4
5
Half-Blind Dovetail
Bit Selection
drawers by at least
1
⁄8"[2mm].
Rabbeted Drawers:
The dovetail bit’s working depth of cut
B
must
be about
1
⁄16"[1mm] less than the rabbet depth
➁
for rabbeted drawer fronts.
Drawer Sides (Tail Board):
Minimum thickness is
1
⁄4"[6mm]. Drawer side thickness
➂
does not affect bit selection.
Note:
B
is the nominal working depth for half-blind dove-
tails, not the maximum depth.
B
must not be varied, except
for minor adjustments for joint fit. See page 37.
Selecting the Bit
Measure the drawer front thickness (minimum
1
⁄2"[12mm])
➀
or rabbet depth (minimum ~
7
⁄16"[11mm])
➁
.
Select a bit with the appropriate depth of cut
B
from the fol-
lowing pages. Can I use any dovetail bit? No, all half-blind bits
must be
1
⁄2" [12,7mm] diameter. As the angle changes, so does
the depth of cut. Using bits that are a different angle and diam-
eter will result in joints that don’t fit, and could damage the jig.
Guidebush
All 8mm shank half-blind dovetail bits listed in this appendix
work with the e7-Bush (
7
⁄16" OD [11,1mm]) supplied with
your Leigh jig, or any
7
⁄16" OD [11,1mm] guidebush. No other
guidebush sizes can be used for half-blind dovetails. See page 70.
Shank Selection
The Leigh D4R Pro comes with two half-blind bits with 8mm
shanks, plus a
1
⁄2"[12,7mm] to 8mm collet reducer. The reducer
➃
simply slides into the
1
⁄2"[12,7mm] collet
➄
of your router,
and the 8mm shank bit is inserted into the collet reducer. The
collet is tightened as normal. The collet reducer is not required
with
1
⁄2"[12,7mm] shank bits. For a
1
⁄2 "[12,7mm] collet you
will require the included
1
⁄2"[12,7mm] to 8mm collet reducer,
No. 172-8.
Note:
➃
is a collet reducer, not a collet
➄
. The reducer does
not replace the collet, it slides directly into your collet.