I decided I needed 2 odds and ends days so I made the pinwheels today. Now I need to put labels on 2 quilts, then quit procrastinating and get back to my other work.
Like usual, I didn't follow the instructions. I've made many HST's that way but that is my least favorite way to do them. If you're using the line on the index card you don't need to mark that center line. Sometimes it is hard to get a straight seam though. Mine sometimes bow a little, but once the block is steam pressed and squared it looks fine. Since I needed 32 HST's for 8 blocks I decided to use 3" triangle paper. That of course didn't give me any extra for squaring the blocks, so after sewing them into pinwheels, and since I decided to twirl the seams instead of pressing them open, they were just a tad small. I will work that out when I sew the blocks together.
My suggestion is if you're using triangle paper, sew the seam just outside the line. For other piecing methods, square the HST's on the inside seams only to end up with approximately 3-5/8" units. Then after the units are sewn into pinwheels, square the blocks to 6-1/2", with the 3-1/4" mark on the ruler at the center of the block. This way you will not have to be so careful on the size of your seam allowances.