If you just need to create simple box joints rather than fancy joinery, MLCS has another system for quickly producing these joints on your router table.
The three different spacer bases in the Multi-Joint system allow you to make 1/2″, 3/8″, and 1/2″ box joints as well as rabbet, dado, spline, and sliding dovetails. The bases are 24″ long pieces of laminated MDF with guide bars made from ultra-high molecular weight polyethylene (UHMW).
To set up the system, choose which size box joint you want to make — we’ll choose 1/2″ for our purposes. Chuck a half-inch straight cutting bit in your router table and place the 1/2″ base over the top of the bit. Use the 1/2″ setup bar to set the height of the bit, use it to set the distance from the bit to the plastic guide bar, and then clamp the base to your table. Then place the right angle fence with the 1/2″ notch over the guide rail and clamp the work piece to the fence. Now you’re ready to start cutting.
When you buy the Multi-Joint system you get 1/4″, 3/8″, and 1/2″ spacer bases, three right angle fences, a dovetail liner offset fence, a positive stop setup block, and five brass setup bars. You’ll need to supply your own 1/4″, 3/8″, and 1/2″ straight cutting bits. You can purchase the entire Multi-Joint spacing system for $120, or you can buy a kit for just one size box joints for $50.