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RTJ400 User Guide
Box Joint Procedures - 3/8"
Chapter 10
10-4 Use the Quick Reference strip to determine the correct
straight bit and eBush combination.
10-3 Board Width Selection
Board widths are determined by the total number of pins and sockets in the joint design and whether the joint is symmetrical or
asymmetrical. Use this chart to determine board widths up to 16" [406mm].
10-6 Prepare four similar boards ¾"× 5" by about 12" long
[19mm × 129mm × 305mm]. For the quick fit test you will need
two test boards about ½" thick. Boards of different thicknesses
may also be joined.
IMPORTANT:
Read this whole chapter before routing any
boards.
10-7
Install the e10 eBush to the router table/router table insert,
set to 5.
10-5 Making a Box Note the symbols indicating either side
of the pin and socket boards can face in or out. With box joints,
the same edge of the board goes against the sidestop.
Symmetrical Board Width Chart for
3⁄8
"
Box Joints
Total Pins & Sockets 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41
Inches 1 ⁄" 1 ⁄" 2 ⁄" 3 ½" 4 ⁄" 5 ⁄" 5 ⁄" 6 ⁄" 7 ⁄" 8 ⁄" 8 ⁄" 9 ¾" 10 ⁄" 11 ⁄" 12 ⁄" 12 ⁄" 13 ⁄" 14 ⁄" 15 ⁄" 16
Millimeters 29 49 69 89 109 129 148 168 188 208 228 248 267 287 307 327 347 367 387 406
Asymmetrical Board Width Chart for
3⁄8
"
Box Joints
Total Pins & Sockets 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
Inches 1 ⁄" 2 ⁄" 3 ⁄" 3 ⁄" 4 ⁄" 5 ⁄" 6 ¼" 7 ⁄" 7 ⁄" 8 ⁄" 9 ⁄" 10 ⁄" 10 ⁄" 11 ⁄" 12 ½" 13 ⁄" 14 ⁄" 14 ⁄" 15 ⁄"
Millimeters 40 60 79 99 119 139 159 179 198 218 238 258 279 298 318 337 357 377 397
Symmetrical Joints have a full pin at
each board edge. e total number of pins
and sockets is always an odd number.
Asymmetrical joints have a pin on one edge and
a socket on the other edge. e total number of pins
and sockets is always an even number.
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