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  & Tenon Jig
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Innovative FMT Features That Benefit You
Click to EnlargeClick to EnlargeClick to EnlargeClick to EnlargeClick to Enlarge Perfect Multiple Joints!
It's remarkably easy to set up perfectly aligned multiple mortises and tenons on the FMT. Precision and repeatability are made possible by adjustable table limit stops (circled here and below) that control the table's range of motion in both X and Y axes. With each mortise or tenon position sighted and limit stops set, you're ready to rout double, quadruple, or even triple joints with the same ease and precision as a single mortise and tenon.


Double and Quadruple Joints
The sequence below shows each step in making double and quadruple joints. In steps 1& 2, the side-to-side limit stops are set to produce double inline tenons. Steps 2 & 3 set the front-to-back limit stops which are used to produce side by side tenons.

Clockwise from left, examples 1 to 4 below show how a quadruple tenon is routed.



From the above sequence, it is also easy to see how double joints are routed – either side by side or in line.

Click to EnlargeTriple Joints
Triple joints are set up just like quads. Make a small stop block to fit between the front-to-back limit stop and post (circled), to position the table for routing the third mortise and tenon.




Wider or Narrower Joints
It's always faster and easier to use a joint guide made to cut the exact mortise and tenon size you want. However, if you don't have the right guide on hand, or if you want to cut a joint that's wider or narrower than the nearest guide size, you can use the table limit stops to change what any given joint guide allows you to do.
In the photo above, a single 1-1/2" joint guide (1) has been used in simple two-step procedures to cut a 1" wide tenon (2) and a 2" wide tenon (3). You can cut tenons as short as twice the diameter of your bit, or up to almost twice the guide length.

The photo above shows that with a 1 1/2" guide (1), a simple two-step procedure is used to rout either a 1" wide joint (2) or a 2" wide joint (3), or any width you choose from; up to nearly two times the guide size or as narrow as two cutter diameters.

Production Routing and Smaller Joints
When you're engaged in a high-volume production job, you can speed up the process considerably by using the largest bit possible to cut tenons smoothly and quickly in one pass. Using a tenon bit larger than the joint guide size will make tenons that are smaller than the guide, so you'll have to use a bit smaller than the guide to cut matching mortises. The principle is simple: any two bit diameters which add up to twice a given joint guide size can be used to make joints the size of the smaller bit. (See drawing at right.)

In the extreme, this technique lets you cut joints much smaller than the FMT's smallest 1/4" joint guides. Delicate furniture parts such as small cabinet door frames, doll house architecture and furniture, and very accurate miniatures all call for mortises and tenons as narrow as 1/8" or even less. The charts on pages 12 (inch measurements) and 14 (metric) show how different bit combinations can crank out such extraordinary joints just as quickly and precisely as larger ones.

This diagram shows how a 3/8" x 1" joint guide can be used for rapid production of 1/4" x 7/8" mortises and tenons. A strong 1/2" bit quickly mills tenons 1/8" narrower and shorter than the guide; a 1/4" bit cuts mortises correspondingly narrower and shorter as well.

Incredible Miniature Joints are Easy!
Click to EnlargeClick to EnlargeClick to EnlargeClick to Enlarge The FMT can rout joints not just smaller than 1/4" but so tiny they're almost beyond belief - all with the same easy setup and adjustable fit you expect in larger joints. These examples of miniature joints show the extreme versatility of the FMT. The 7-1/2" ebony and holly ladder leaning against a 1/2" X 5" tenon has ebony wedged tenons 1/16" X 1/8".

The matches have progressively smaller tenons mortised through other tenons, featuring joints .040" X .095", .023" X .068" and .013" X .053" respectively. The smallest mortise and tenon was routed with .010" mortise and 31/64" tenon machine tool bits. These matchstick joints actually creak when assembling! And if you're wondering how pieces such as the matches, miniature table parts and some of the curved workpieces are held in place, here's how: there are twelve through-holes in the clamp plate with which shop-made auxiliary plywood plates, blocks, and work-holding fixtures can be attached and used together with the Leigh cam clamps. It's all in the easy-to-follow Leigh User Guide.

Bonus Feature:
Floating Tenons and Doweling
Traditional mortise and tenon joinery isn't practical on miter joints, though often they need all the strength that tenons provide. The FMT makes it easy to mortise both sides of a miter then glue in a shop-made floating tenon for the strongest possible joint. Doweling, though not as strong, is just as easy to set up and is faster overall when you don't have time to prepare floating tenon stock.


* The FMT is patented in the USA, Canada and Europe.

Gallery

Purchase these products:
Pricing
FMT Pro  FMT Frame Mortise & Tenon Jig
Shipping weight 30lb
$1049.00 USD
FMT Pro-M  FMT Frame Mortise & Tenon Jig (Metric)
Shipping weight 30lb.
$1049.00 USD
162-180C  Solid Carbide Boxed Bit Set 162, 164C, 166C, 168C, 170-500C, 173-500C, 177C, 180CL. Note: No.162 is HSS. Solid carbide bits keep an edge for a lot longer than HSS. $309.00 USD
162-180  HSS Boxed Bit Set 162, 164, 166, 168, 170-500, 173-500, 177, 180. $189.00 USD
ACMTC  Accessory Kit (for FMT Pro & Super FMT)
8-piece boxed bit set in Solid Carbide (162-180C) and 16 optional guides in 1/4", 3/8" and 1/2" sizes for a complete set 6720.
$379.00 USD
ACMT  Accessory Kit (for FMT Pro & Super FMT)
8-piece boxed bit set in HSS(162-180)and 16 optional guides in 1/4", 3/8" and 1/2" sizes for a complete set (6720).
$259.00 USD
6166A  FMT Sidestop Fence The redesigned sidestop fence is simple to install and use for all 90º tenons. Angled and compound tenons are easily aligned and routed when the fence is reversed front to back. When inverted top to bottom on the jig, the upper portion of the fence supports the ends of small mortise boards, preventing board deflection and vibration.$20.00 USD
168-500  1/4'' HSS Louver Guide Bit with 1/2'' shank$19.00 USD
Super FMT  Super FMT Mortise & Tenon Jig
Shipping Weight 30 lb.
$519.00 USD

Click here to view our shipping rates.



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