For a 12 inch finished Pinwheel Star you need:
From the yellow cut two 5 1/4 inch squares
From light blue cut one 5 1/4 inch square
From dark blue cut two 2 7/8 inch squares
From a background cut one 5 1/4 inch square, four 4 1/2 inch squares and two 2 7/8 inch squares.
You will start with the 5 1/4 inch squares, and cut them twice on each diagonal.
Sew these together in units as diagramed below. Be very careful when handling these pieces, as you are dealing with bias edges. Bias will stretch if handled roughly. I suggest that you pin carefully to avoid stretching.
Next make the center square, the pinwheel, which is made of four triangle squares.
Take the 2 7/8 inch squares of blue and background, place them right sides together. Carefully draw a line down the center, corner to corner, diagonally across the block. (This will be a cutting line when you are finished.) Now if you have a true 1/4 inch foot on your machine, you can sew on either side of this drawn line. If not, you will have to draw a second line on either side, exactly 1/4 inch from the first line. These will be your sewing lines. After you have sewn on your sewing lines, you will cut this square in half on your cutting line.
Press to the darker fabric. Don't forget to trim your dog ears. Your finished diagonal half-squares should measure exactly 2 1/2 inches.
Posted May 1, 2015
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