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Is it possible to dovetail a board that is over 6' long while laying flat on a bench with a General Tools dovetail jig? I am building a workbench that I want to use 3/4" Poplar around the outside edges. The core of the bench is 4 pieces of 3/4" plywood that has been laminated together. I want to use this jig with my handheld Porter Cable router.The bench is just over 6' long by 24" wide.
 

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That's not the kind of joint I would do for that purpose. First of all, it's very difficult to find straight enough poplar to make such a joint line up after you cut the dovetails. I would more likely consider using some screws to attach the poplar strips, so you could replace it if it gets dinged too badly. I'd line up the top of the table with the poplar strips as best as I could, then plane the poplar flat to the table with a hand plane.

Or use a table saw jig like this to flatten the top edge of the poplar so it lines up with the table top.
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I've been able to find a few, select pieces of poplar that were straight enough for face frames, but It's maybe one out of a dozen strips. I know our local HD restocks lumber on Tuesdays, so I go in on Wednesday early and pick the best pieces. I can find 6 and 8 footers that are pretty darn good in 1.5 inch width. You could also buy some straight wider pieces a bit more than twice as wide as the strip you need, and halve it with a table saw.

I personally don't really like the look of dovetails. Good for strength, but not very attractive to me. I think using them on a very long edge is just unnecessary overkill. IMHO.
 

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I've used the edge of the opening of my pull-down stairway to the shop's attic for both my Leigh D4R and my FMT Pro jigs. I also borrowed the use of the railing on my neighbor's 2nd floor deck for the FMT Pro when I needed to do this kind of thing. You've just got to "Think Outside The Box" when a need like this arises.

Charley
 

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Is it possible to dovetail a board that is over 6' long while laying flat on a bench with a General Tools dovetail jig? I am building a workbench that I want to use 3/4" Poplar around the outside edges. The core of the bench is 4 pieces of 3/4" plywood that has been laminated together. I want to use this jig with my handheld Porter Cable router.The bench is just over 6' long by 24" wide.
Dovetails are usually used along the periphery of loose fitting panels, such as drawer bottoms, simply because they have no give. Fitting to the exact length would be quite a challenge, and would have built in movement conflict. My apron is 5/4 ash doweled along its length front and back and breadboarded at the ends of which sliding dovetails would be great for that application. The corners are not attached to allow movement. It hangs about 2 inches lower than the top for easy removal of bench dogs and irons that match the front vise, whose back jaw is the apron. The bottom edge on the front side is beveled front and back for the deadman slide.
 
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