Acrobats: Quarter Square Triangles

Several years back I was introduced to a fantastic book: 501 Rotary Cut Quilt Blocks by Judy Hopkins.  I have found this book to be a fantastic resource. I use this book often. How do I use it? I have challenged my private Facebook group: Sew Anyways with Nancy McNally to learn 2 new blocks a month. We are currently in our 1st month, block 2: Acrobats.

https://www.facebook.com/groups/240137286367256/

In order to join my group, you have to answer the questions when you request to join. I will approve your membership as soon as I see your request. Now, back to the quarter square block.

The Acrobats block is made up of  9 quarter square triangle units and 11 squares. The layout of the QST. + the Sq. makes the block appear as if there is an X  running through it. This is a block that is not seen very often in the public domain of the World of Quilting. That is the reason I chose Acrobats for the 2nd block of this month.

Let’s talk about Quarter Square Triangle (QST).

It consists of 4 triangles (hence the name quarter).

A QST consists of 4 triangles sewn together to create a square. You can’t just sew any type/group of triangles to create a QST. The triangles must have the cross or straight of grain as their base or bottom. The 2 remaining sides of the triangle come together to form a 90° angle (the center)…but don’t put this one the outside…its cut from the bias! That means it will stretch or distort.

In order to figure out what size of a QST you need, there is some math you need to do…I know I know…just bare with me.

Let’s say we want a 3″ FINISHED size QST block/unit : add 1.25 to your 3″

We want our QST to have 2 different fabrics.

3″ + 1.25 = 4.25

We will need 2 fabrics cut at 4.25″ (4 1/4″) squares.

Cut on BOTH diagonals.

Place fabrics in the layout you would like and sew.

The QST will measure 3 1/2″ x 3 1/2″ this is the unfinished size

It will finish at 3″ x 3″. In the diagram below. I have 2 squares lined up (1 black & 1 white). Blue lines going through both blocks showing to cut on both diagonals. You will yield 4 triangles of each. I only show 2 of each, because that is all you need for 1 quarter square triangle block/unit. You will yield 2 quarter square triangle blocks/units total. The 3rd picture in the diagram shows which ones to sew together. Press towards the darker color. Pressing lines/arrows are not shown in the picture.

Sew…that is how you do the math for a Quarter Square Triangle! It is really simple!

The only step remaining once you piece your quarter square triangle block is to trim to the correct size. Sometimes sewing triangles can be tricky, they can slide or move. Once your block is pieced, iron, then trim to the correct size. For Trimming, I always find center. Align my ruler on the center. See the diagram below.

My block is 3″, center is 1.5. I rest the 1.5 intersection on my ruler on the very center of my block. I have it circled in red. Before trimming, check all 4 sides of the ruler/block. Make SURE the fabric is extending past the desired measurement, not less than or on the inside of the desired amount. If my fabric would have been on the other side (less than) of the 3″ mark…going towards the 2″ side, I would not trim. At that point, I would begin examining my seam allowance…

As for the Acrobat Block,

Happy Quilting!

Nancy McNally