Leigh Super12 - HB Cutting Depth Recommendations; Critical HB Depth of Cut Guidance

VARIABLY SPACED HALF-BLIND DOVETAIL PROCEDURES
30
Chapter 9 Super Jig-12-18-24 User Guide

Pins
h

Pin sockets

Half-pins
➃
Half-pin sockets
➄
Tails
H

Tail sockets
➆
Depth of Cut (tails)
➇
Depth of Cut (pins)
1
3
5
7
8
Depth
of Cut
Depth
of Cut
22
6
4
9-1 Half-Blind Dovetail Terminology:
The pins fit in the pin sockets. Joints almost always begin and
end with a half-pin as shown.
Bit selection is critical. You need to
select a specific dovetail bit for your half-
blind dovetail project, depending on the
pinboard (drawer front) thickness you
are using.
• Choose one of the five
1
⁄2" [12,7mm]
diameter dovetail bits shown above.
Check bit selection in Appendix II.
• Depth of cut must be as specified for
each of the five bits illustrated above.
Note: Leigh bits 101-8, 112-8 and 128-8
are optional.
• Raising the bit above its specified cut-
ting depth will result in loose joints
and may damage the jig, bit and/
or guidebush. A lower setting will
result in tighter joints that may not
fit together.
• Small Depth of Cut adjustments will
change joint fit tightness. See why in
Steps 9-3 to 9-5.
• Half-blind PINS and TAILS are rout-
ed with the same dovetail bit and must
be at the same Depth of Cut.
• All half-blind dovetail bits work with
the Leigh e7-Bush supplied with your
Leigh jig or standard
7
⁄16"[11,1mm]
outside diameter guidebush.
• A dovetail bit will produce only on
specific cutting depth. Only 1/2”
[12,7mm] cutting diameter bits can
be used for half-blind dovetails.
 Important! Read This About HB Depth of Cut
9-2 Cutting Depth for Variably Spaced Half-Blind Dovetails
Note: Add at least
1
⁄8"[3,2mm] to the depth of cut for board thickness.
*
Included with jig. ~ Symbol for "approximately"
Minimum pin board
thickness 1/2"[12,7mm]
Depth of cut:
~3/8" [9,5mm]
128-8
18°
120-8
14°
112-8
12°
Minimum pin board
thickness 9/16"[14,3mm]
Depth of cut:
~7/16" [11,1mm]
Minimum pin board
thickness 5/8"[15,8mm]
Depth of cut:
~1/2" [12,7mm]
101-8
10°
80-8
8°
Minimum pin board
thickness 3/4"[19mm]
Depth of cut:
~5/8" [15,8mm]
Minimum pin board
thickness 7/8"[22,2mm]
Depth of cut:
~3/4" [19mm]
~3/8"
[9,5mm]
1/2"
[12,7mm]
1/8"[3,2mm]
Min
1/8"[3,2mm]
Min
~7/16"
[11,1mm]
1/2"
[12,7mm]
1/8"[3,2mm]
Min
~1/2"
[12,7mm]
1/2"
[12,7mm]
1/8"[3,2mm]
Min
~5/8"
[15,8mm]
1/2"
[12,7mm]
1/8"[3,2mm]
Min
~3/4"
[19mm]
1/2"
[12,7mm]
Pinboard Pinboard
Pinboard
Pinboard
Pinboard
* *