How I sew the curve with just one pin........
First I find the center of both pieces and pin them together with the concave piece on top.
Then I go to the end of the seam and baste with a few stitches. This works better than a pin because the fabric always moves when you pull the pin out. This last corner will try to swing out crooked if it isn't attached. This picture was taken with super macro so it looks like a big mismatch at the end of the seam when in reality it is about 1/16th of an inch off.
Then I sew a few stitches at the beginning of the seam and stop with the needle down. Then just smooth the top curve to match the bottom. Sew slowly and use your fingers to hold it in place as it moves into the presser foot.
When you get to the center again stop with the needle down. Hold the basted corner with your right hand and with your left hand just smooth the top piece out to match the bottom piece. I didn't have 2 hands to show this since one was holding the camera.
Once again your fingers will just ride on the fabric holding it in place as it gets sewn.
And there you have it, another block finished.
I was holding the fabric with one hand and the camera with the other hand. I took pictures of the first block but wasn't happy with some of the shots so had to start a second block and retake some of the parts. You may or may not have noticed the top fabric isn't the same in all of the pictures.
Some of the blocks will have strip pieced sections in both parts, some will have plain fabric for one of the parts. Click on Strips and Curves in my Labels list to see all of the quilts made from this type block. When you have pieced sections both top and bottom, you just roll the top piece back 1/4" as you approach each seam and see that it is matching with the seam on the bottom piece. It is just a little slower sewing those blocks.
Today I am meeting some of my students to help them with their fabric choices. Also one lady couldn't make it to the demo so I'll meet briefly with her to explain the pressing procedure that is in the book.