Tom Bellemare said:
MFT's can be joined many ways...
Tom
Tom,
That's a nice link to demonstrate the basic capabilities of a single MFT/3. It contains
nothing about joining two or more MFTs in any way, let alone into a T-shape.
Deke,
I don't have any MFT/3s, but I do have three earlier style MFTs, one MFT 1080, and two MFT 800s. I have joined them into an L-shape using only one of Festool's metal connectors. My standard setup is to join them in-line using a pair of Festool's metal connectors. I have also joined them in-line but spaced apart using a pair of Squaring Arms which I made based on the description given in Jerry Work's manual on use of the (old style) MFTs. Here's an example of a spaced in-line arrangement. The tables are positioned exactly the right distance apart to enable the workpieces to be wedged between the tops of the MFTS to facilitate cutting out the centers and routing a lip on the short shelves. Note the laminated (walnut and 1/2 inch birch plywood member joining the tables. There is a similar connector linking the MFTs in the back.
Right angle brackets for joining a pair of MFT/3s in a T-shape could be made of solid wood and plywood. For each right angle connector bracket, make a right triangle of 3/4 plywood or MDF. Then make short lengths of ~1" x 3" as if you were making short Squaring Arms, each with at least a couple of holes for insertion of T-bolts so the short arm can be attached to the side rails of the MFT/3 (or any MFT). Join the short Squaring Arms to the base and elevation sides of your plywood triangle using dados or Domino tenons and glue, offsetting the Squaring Arms elevation relative to the triangle so you can easily access the knobs to tighten the T-bolts upon installation of your Right Angle Connector Brackets. Obviously, you could make up the right triangle with reinforced edges, then bore two holes through each of those edge for insertion of the T-bolts.
Not that if you make these brackets accurately, they could also be used for setup and assembly work. The flanges with the T-bolt holes can be clamped to the two workpieces to be held at a right angle to each another.
As others have said, T-connectors could also be made of metal. If you have access to any right angle brackets made from angle iron or aluminum, all you'd have to do is drill some holes for insertion of a pair of T-bolts in each arm. Commercially available shelf brackets might work, but most that I have seen do not have a true 90 degree angle between their arms; they intentionally have a larger included angle so that the shelf is tilted slightly upward when installed and gradually tilts toward level when loaded.
Dave R.