This easy block could range in size from 8 inches to 12 inches. As you can see there are many ways to color this block. Version A on the left shows just the pinwheel on a plain background.
You may choose to use 12 squares and 4 half-square triangles to make each the block.
Or you may want to use the speedy "quick corner triangle" assembly method shown below.
For review of making HST's in quick methods, see the Half Square Triangles article here. By counting how many combinations you need of each pair of fabrics you can "gang up" your HST's for faster sewing.
Think of the Pinwheel block as being made of 4 strips as shown
below. There are 2 each of 2 strips (see below the block image to see the 2
Note: I am not showing the seam allowances around the strips, but it is assumed that there is a 1/4" allowance added.
You will cut (for an 8" finished block) strips of fabric into 2.5" wide strips for use in making this block. From these 2.5" wide strips you will cut the squares and rectangles to use to make the block as shown below.
= make 2
= make 2
To use the "quick corner triangle" method you will work with squares and not with cut bias edges of triangles. There is a small amount of waste fabric when you trim the triangles, but you can keep these pieces to make small half triangle squares for another project or a border if you wish.
We are going to assume you wish to make a finished sewn 8" block for this example. If you are making many blocks you can strip piece so that you can cut the strip #1
The left yellow square is 2" x 2" sewn (2.5" x 2.5" unsewn)
The right purple section is 2" x 6" sewn (or 2.5 x 6.5" unsewn)
After assembly - the strip is 8.5" wide
At the right end of the strip you will diagonally sew another 2.5" x 2.5" yellow square to the end as shown with the dashed line in strip #1-A
= strip #1A
Now trim away, leaving a 1/4" seam allowance as shown. Open the yellow triangle formed and press to result in strip #1B
= Strip #1B
Make two of these for one Pinwheel block
This 2nd strip can be thought of as two parts as below.
Two yellow strips each (unsewn) 2.5" x 4.5" with a purple triangle attached as shown.
Now you can add the purple triangle in the same way you added a yellow one above = Take a 2.5" x 2.5" purple square and diagonally sew it to one of the yellow strips, then cut and press. then assemble the two sides to form strip #2. The finished size unsewn will be 2.5" x 8.5"
Make two of these for one pinwheel block
Now assemble the 2 pairs of strips into a Pinwheel block.
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