The 9 Patch in Sawtooth Star Quilting Block
You can see from the pictures that the center of this block is a 9-patch block. It is also very easy to see the flying geese blocks around the sides. There are four squares in the corners, and that is it.
The only tricky part with this block is making the 9-patch conform to the Simple Measurements. You want to make this block with Simple Measurements because you want this block to fit with other 4-patch blocks. < See grids and patchwork >
The trick is to make the 9-patch unit fit the flying geese block. If you plan each grid in this block to finish at 2 inches, that means the flying geese block will take up 2 grids. The raw measurement of the flying geese block will be 4 1/2 inches by 2 1/2 inches. This means your 9-patch must be put together so that it is 4 1/4 inches raw.
You cannot use simple measurements for your squares (or strips). Again, you have to cut the squares so that when pieced, the three of them will measure 4 1/2 inches raw so they will fit the flying geese block. That will take some math.
If you were to cut the strips at 2 inches raw, after sewing them together you would be left with 5 inches raw. That is 1/2 inch too big. Your closest measurement is 1 7/8 inches raw, and that is going to make the block 1/8 inch too large.
The easiest way to handle this is to make a test piece. Cut 3 squares at 1 7/8 inch raw and sew them together. Then measure the width. It will vary, depending on how deep you sew your seam allowance. Adjust your strip width or your seam allowance just a little bit to get your 9-patch to measure 4 1/2 inches raw.
It is better to make your 9-patch a little larger then too small. You can always shave a little bit off each side to make it smaller.
This will be an easy block, as long as you take the time to make sure the 9-patch fits the flying geese block.