I'm planning to build a dresser out of plywood that's around 5-6 feet long and 3 feet high, featuring mitered edges. I've heard mixed opinions about when to use dominos during the glue-up process. Do they actually add strength, or are they mainly just to keep everything aligned? I don't have a domino machine, so what alternatives can I use if I decide they're necessary for my mitered edges? P.S. the depth will be about 18-20 inches.
3 Answers
Miter joints can be tricky, especially since the end grain isn't super strong. When working with a long miter like yours, it's smart to use something to reinforce it. It really helps if there's support from the back or bottom. Dominos aren't strictly necessary; dowels or splines can do the job, too. Since this is your first time, I'd recommend practicing on some scrap wood to get a feel for it!
Mitered joints are a step up in woodworking; they require precision cuts on both surfaces. Because you're dealing with challenging grain orientations, you'll want to prevent any sliding when you glue them. Dominos will help keep your pieces aligned and reinforced, but I've also successfully used splines in miter joints. If you want to go that route, you can create a long channel for the spline using a router or tablesaw. Just practice first for accuracy!
Using dominos definitely adds some surface area to your glue-up, giving you a bit of extra strength. But the big advantage they provide is alignment during the glue-up process. With dominos or dowels, your dry-fit and wet-fit will match perfectly, minimizing movement as you clamp everything together.