Leigh rtj400 - Chapter 9 Half-Blind Dovetails

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RTJ400 User Guide
Half-Blind Dovetail Joint Procedures
Chapter 9
9-6 Prepare six similar boards (two for testing) about ⅝"×
6¼" by about 12" long [13mm × 159mm × 305mm]. Boards of
different thicknesses may also be joined.  IMPORTANT: Read
this whole chapter before routing any boards.
9-7 Fit the e10 eBush to the router table/router table insert, set
to 5. The eBush is used to adjust joint fit.
Board Width Selection for Half-Blind Dovetails
No. of Tails 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Inches
Min ⁄" 1 ⁄" 2 ⁄" 3 " 3 ⁄" 4 ⁄" 5 ⁄" 6 ⁄" 6 ⁄" 7 ⁄" 8 ⁄" 9 ¼" 10 ⁄" 10 ⁄" 11 ⁄" 12 ⁄" 13 ⁄" 13 ⁄" 14 ⁄" 15 ½"
Exact ⁄" 1 ⁄" 2 ⁄" 3 ⁄" 3 ⁄" 4 ⁄" 5 ⁄" 6 ¼" 7 ⁄" 7 ⁄" 8 ⁄" 9 ⁄" 10 ⁄" 10 ⁄" 11 ⁄" 12 ½" 13 ⁄" 14 ⁄" 14 ⁄" 15 ⁄"
Max 1 ⁄" 1 ⁄" 2 ⁄" 3 ⁄" 4 ⁄" 5 ⁄" 5 ⁄" 6 ⁄" 7 ⁄" 8 ⁄" 8 ⁄" 9 ¾" 10 ⁄" 11 ⁄" 12 ⁄" 12 ⁄" 13 ⁄" 14 ⁄" 14 ⁄" 16"
No. of Tails 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Millimeters
Min 17 37 56 76 96 116 136 156 175 195 215 235 255 275 294 314 334 354 374 394
Exact 20 40 60 79 99 119 139 159 179 198 218 238 258 278 298 318 337 357 377 397
Max 29 49 69 89 109 129 148 168 188 208 228 248 267 287 307 327 347 367 387 406
9-3 Board Width Selection
Use this chart to determine the board width for your project. Half-blind joints may be routed in
boards up to 1" thick. Board widths are based on the number of full tails
A
in the joint design.
Board edges always end with a half pin
B
. Board widths in the chart below may be increased by ¼"
[6mm] or decreased by ⅛" [3mm] if required.
9-4 Use the Quick Reference strip to determine the correct
dovetail bit and guide bushing combination for the board
thickness, in this case, the Leigh e10 Guide Bushing and the
optional ½" 18
º
dovetail bit.
A
B
9-5 Making a Box Note the symbols indicating the inside
or outside of the pin and tail boards. When assembled with the
finished pieces properly oriented, any one of the pin ends will fit
any one of the tail ends. Mark the inside faces of the tail boards
A
and outside face of the pin boards
B
.
A
A
B
B