To begin, you will pair two 5" charm squares together, right sides together and make a half square unit like we made last week. If you need a refresher or missed it, you can read about it here. As you can see, I already pressed my half square units when I realized I hadn't taken a picture yet so that's why they look like this.
Now place the two half square triangle units together, right sides together and opposite of each other. You will place them directly on top of each other when you do this. In this picture I staggered them so you could so the opposites.
Now draw a diagonal line from corner to corner.
Sew 1/4" from each side of the drawn line and cut apart. You can check your intersection to see if the seams match before cutting but if the seams lock together, they will match.
Open and press to one side. You will now have 2 hourglass units. Square them to 3 1/2". I like to use the rulers from Eleanor Burns Quilt In A Day to square them as they have an X on them and it's easy to line the X up with the seam lines. They come in several handy sizes. I have 2 1/2", 3 1/2" 4 1/2" and 6 1/2" in my collection.
This method will give you 2 hourglass blocks.
I have one more unit to show you next week on Tips Tricks and Tuts Tuesday with charm squares and then I'll share some layout ideas using them.