Leigh FMT PRO, User Manual

Page: 59 / 74

JOINT SPECIFICATIONS, GUIDE & BIT SELECTION
FMT PRO Appendix I
55
Joint Specifications,
Guide & Bit Selection
A1-1 Joint Terminology
The tenon sides are the “Cheeks”
➀
.
The tenon shoulders are called (luckily) the “Shoulders”
➁
.
Unfortunately, references to dimensions of mortises and tenons
do not share matching terminology, so...
Long or short tenons
➂
fit into deep or shallow mortises
➃
.
Tenon Length = Mortise Depth.
1
2
3
4
A1-2
Wide or narrow tenons
➄
fit into long or short mortis-
es
➅
.
Tenon Width = Mortise Length.
6
5
A1-3
Thick or thin tenons
➆
fit into wide or narrow mortises
➇
.
Tenon Thickness = Mortise Width.
7
8
A1-4 Largest Single Rail and Tenon
Using One Table Position with
1
⁄
2
" Bit
➀
Workpiece thickness 1 5 ⁄
16
"[34mm]
➁
Workpiece width 3
1
⁄
8
" [80mm]
➂
Tenon thickness 1 ⁄
2
" [12mm]
➃
Tenon width 2
1
⁄
2
"[65mm]
Note: To rout single tenons in stock thicker than 1 5 ⁄
16
"[34mm] would
require the bit to be plunged into the edge of the workpiece and so
“trapping” the bit. That could be dangerous, so follow the “Third
Tenon” procedure (see 5-39 through 5-44).
2
4
1 3
Foreword
The illustrations and specifications in this Appendix show the largest tenon rail and tenon sizes possible
on the FMT Pro, either in one table position or multiple table positions as noted. For all smaller sizes, refer to the
guide and bit selection chart.
Joint Specifications