Corner Clamp - DIY





Introduction: Corner Clamp - DIY

About: I'm not an expert in anything. I just enjoy making things sometimes for the process sometimes for the end product.

I made a corner clamp out of a couple of squares, some epoxy and a few screws. The idea here was to have something that I can use to clamp 90 degree angles with. I looked in to buying the 3D corner clamps but they were $30-$35 a pair. So instead I came up with this idea. The squares were $2.00 each. The epoxy and screws I already had in my garage. They are nowhere near as good as an actual 3D corner clamp but they seem to do the trick.

Step 1:

I got this tip from watching other Youtubers. When ever I'm mixing a small amount of epoxy I put down some blue tape to mix on. This way I know the surface is clean and when I'm done I can just throw away the tape.

Step 2:

The first picture is how they will be glued together. You spread the epoxy on to one of the squares nice and thick since there are a lot of crevices on the squares. Then you put them together and use some spring clamps to keep them nice and snug. You will most likely have some squeeze out now would be a good time to clean it with some paper towels. You let it dry for how ever long the instructions on the epoxy say to leave it drying.

Step 3:

Next I cut out a notch to create a hold or grabbing point for the clamps. I used an angle grinder with a cut off wheel but you could use a hack saw since these are aluminum which it isn't to tough to cut by hand.

Step 4:

And this is how I use it. Basically this allows me to join two pieces of wood at a 90 degree angle. The clamps hold the two pieces while I pre-drill and then screw together the wood. It worked pretty well once it was clamped I could lift the whole piece up and move it around and didn't have to worry about losing my 90 degree angle.

Step 5:

I thought it might be a good idea to reinforce the epoxy with some screws. I figured that over time and with use the epoxy wouldn't hold. So I drilled three holes, one on each corner and then secured them with a fastener and a nut. The holes I drilled for the screws were very close to the diameter of the fasteners I used so that there wouldn't be any wiggle room.

Step 6:

The beauty shots. ;) Here is what the finished product looks like. I hope you find this helpful and maybe add it to your tool collection. I bought the corner clamps at Harbor Freight for $1.99 each. This is a relatively inexpensive solution for about $5 I was able to make this corner clamp.



    • Woodworking Contest

      Woodworking Contest
    • Make it Move Contest

      Make it Move Contest
    • Casting Contest

      Casting Contest

    We have a be nice policy.
    Please be positive and constructive.




    Awesome! I was thinking of doing just this when I found your ‘ible. Used cheapo harbor freight speed squares and they work great!

    1 reply

    Took the word right out of my mouth :).

    I liked the tip on the blue tape too. Nice idea

    After buying two of the commercial corner clamps myself, I find this an inexpensive, and good, alternative. One suggestion, use a square to verify the two units before the epoxy sets up. Those cheap Chinese castings aren't always quite square.....

    1 reply

    I agree, great suggestion I did this before the epoxy set up with my "nicer" square to confirm the angle was correct.

    I didn't understand exactly what you did, Did you just combine the squares to make them easier to use?

    Oh, And Step #1 is a great idea, Thanks for sharing!

    1 reply

    Basically I joined the two squares with the two broader flat sides forming a 90 degree angle. I was trying to come up with a version of this which are really handy when joining two pieces of wood at a 90 degree angle. It can be a bit of a task to glue or screw together two boards at a perfect 90 degree angle, at least for me anyways, so I made this to help myself out. Check out my video here it might make a little more sense to watch me use it.

    great idea. I didn't want to spend a lot of money on commercial corners either and this looks like a great solution

    1 reply

    Thanks, I've used it a couple of times since I made it and they really do work pretty well.