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Common Joinery Installation Mistakes and How We Prevent Them

Make chips on a smooth edge. Room between the sides. A stray combination square that slips out of your hand and pierces a piece of wood that you just sanded.

When things go wrong in the woodshop, it can feel like the world is no longer fun.

Now, breathe deeply and fight the urge to throw a tool across the shop. Because making mistakes is a normal part of working with wood.

A master woodworker taught me a class years ago. He told me that he still makes big mistakes and a lot of little ones on every job.

That's why I always say that being able to fix your mistakes is what makes a great maker.

Today, we'll look at some of the most common mistakes people make when they work with wood.

But first, you need to know...

The #1 Rule About Woodworking Mistakes:

Stop letting everyone know about them! You are already better at woodworking than more than 90% of people in the world.

Everyone will not only not notice your mistakes, but also have no idea what you're on about when you complain about the pins in your dovetails.

How to Avoid Woodworking Mistakes

The more you work with wood, the better you'll be able to see mistakes coming and avoid them.

Still, here are some tips that will help you avoid a lot of trouble.

Have a Plan

It doesn't matter if you use Fusion 360, the free version of Sketchup, or the back of a junk mailer with a great new credit card deal. Making a build plan changes everything.

It helps you see where problems might happen before you start, and it also gives you something to look at while you're cutting.

It also helps you get the most out of your wood, which is important since good woods isn't cheap these days.

Use the Right Tool, the Right Way

You shouldn't bring a tool to a fight over a router, but I wouldn't bring either one either.

In woodworking, there are a million different ways to get the same result. To avoid mistakes, it's important to know which way works best in each case.

While power tools are fast and effective, hand tools may be better for fine work that needs to be very precise.

When you use power tools, remember to make several small passes instead of one big pass. It'll work better and keep you safer. When it comes to routers and dado stacks, this is very important to remember.

Measure Once, Cut Again and Again and Again

Set yourself up to measure as little as possible. It sounds silly, but it will help you get more accurate results. It's important to be able to do things over and over again, and jigs are the best way to do that.

You can use one leg as a guide to make the other three the same length if you need all four to be the same length.

You could set up a stop block on your table saw or line up the legs and use a track saw to cut them all at once.

You have a WAY better chance of getting legs that are the same size this way than if you used a tape measure and a writing knife on each one separately.

Must-Have Materials for Fixing Woodworking Mistakes

Make sure your shop has these things on hand so you're always ready to fix things.

  • CA glue: This quick-drying glue, which is also called "super glue," is a woodshop lifesaver.
  • CA glue activator: This tool makes CA glue ties stick even faster, so you don't have to stop working.
  • Tape in blue: It can stretch a little and clamp down for quick fixes. It's also good for keeping glue off of places you don't want it.
  • If you are patient and have a little more time, wood glue can make very strong ties.
  • Timber Mate is my favorite wood filler (this isn't paid for, just so you know). They match a lot of different types of wood well, don't go bad because they're water-based, and polish up well. Check them out here if you're interested.
  • The putty knife is used to spread the filler out.

7 Woodworking Mistakes You Can Easily Fix

As a builder, these are the mistakes you'll most likely make, from "oh shoot" to "Honey, put down the pipe clamp."

1. SMALL DINGS AND SCRATCHES

Bring out the wood filler if you have a nick that is too deep to sand out.

  • Use a putty knife to spread the filler over the scratch. Look for a color that is close to the wood species. Do not let too much build up.
  • Let the filler dry for a minute or two. When the color changes from dark to light, you'll know it's done.
  • Use sandpaper with a fine grit to buff it down.

One thing I like about Timber Mate is that it's water-based and won't go bad. Pour some water over it and let it sit for a while if it gets dry.

It's also possible to mix colors to make a custom color that fits your stock better.

2. Dents

The first time I saw this trick, it blew my mind. It fixes dents in wood where the grain hasn't been broken or gone through, like when a hammer falls on it.

  1. Place a wet rag over the dent in your piece of work.
  2. A clothes iron should be run over the rag a few times.

It should come back up flush with the heat and wetness, giving you a flat, damage-free piece of work.

3. Chip Out (With Chip)

You might chip out a piece of wood along one of the edges if you use a chisel or handplane.

Look for that chip. If you want to keep your shop clean and free of dust, this is a great reason to do so.

It's just a matter of putting the chip back in place once you have it.

If you need to get somewhere quickly:

  1. Add some CA glue to the chip's inside.
  2. Spray the area where the activator will be used to reconnect it.
  3. For a short time, hold the chip in place with your finger.

This can also be done with chips that are still attached to the wood. Put CA glue in the crack, spray it with activator, and use your finger to hold it in place.

Something to remember about CA glue: Your finger WILL stick to the piece of work. They say that if you pull your finger off, you might tear off the wood chip again.

That's because CA glue can pull very hard. It does, however, have terrible shear strength.

When you twist your finger before pulling it off the chip, you keep it from coming off again.

If you have more time, you can stick the chip on with wood glue and use painter's tape to hold it in place and push down on it.

4. Chip Out (Without Chip)

As you finish the edge of a board, a chip flies off and lands on the floor. You look for it in mounds of sawdust, but you can't find it.

  1. Don't be scared. Thanks to Marc Spagnulo a.k.a. The Whisperer in Wood.
  2. Flatten out the part of your board that chipped out with a hand plane.
  3. From a scrap piece that matches your board, cut a strip. This strip should go past the edge of the chip that is missing.
  4. Put CA glue on the flattened piece, spray activator on the extra strip, and then put the strip on top of the flattened piece.
  5. Take the strip down with a hand plane to fill in the blank spot on the board perfectly.

It's possible to get great results if you take the time to match the grain.

5. Cupped Board

There's a chance that when you come back the next day, the board you worked on has been covered. Especially if you're trying to bookmatch the grain, it can feel pretty bad.

This kind of wood movement is caused by differences in the amount of moisture inside and outside the board. This trick also works on the same concept.

Note: It doesn't always work, but you should try it anyway.

  1. Put the board with the rounded side down on some cauls in the shape of an arch. For mold not to grow, the cauls are very important.
  2. Wipe the side of your board that doesn't have cups clean with a damp cloth until it's completely wet.
  3. Lay the board out flat overnight with something heavy on top of it.

Your board should be flat and ready to use when you get back in the morning.

6. Gaps in Panel Glue Up

Have you ever glued up two boards for a panel and seen a big hole in the middle? It may seem hopeless, but this is easy to fix.

  1. The two boards should be folded in half so that both of their show sides are facing outward. To keep them together, you can use double-stick tape or two pieces of blue tape with CA glue in the middle.
  2. Make both sides flat by running a hand plane along them at the same time.

When you lay the boards back out, they will fit together perfectly, even if you plane the sides at a crazy 30° angle. No need for a jointer.

7. Gaps in Joinery

After spending hours cutting what looked like a perfect joint, you find gaps in it when you put it together.

Now is a great time to use sawdust and glue, which is my favorite "wood filler" that I make myself.

  1. Get out your sander and vacuum out the dust bag. Then, use 80-grit sandpaper on a piece of the same species as your job. After shaking the bag of sawdust on your workbench, you'll have a nice pile of sawdust that fits together nicely.
  2. Make sure you put on enough glue so that it can squeeze out of all the joints when you're done. Wipe off all of the extra glue very well.
  3. Spread the sawdust around the joint's edges. Go crazy.

The joint will look as tight as a ½-inch stick smashed into a ¼-inch hole when the glue dries.

Since I'm being honest, I even use this trick on perfectly joined furniture. It promises that a few weeks from now I won't find a gap that I'll be crazy about for all time.

Your Mistakes Make You Better

It's normal for even the best woodworkers to make mistakes. You learn how to deal with them without getting angry over time...

Always remember that every mistake you make is a chance to get better at woodworking.