If you want tosew a large circle, try this golden oldie method: Cut the circle(s) the size you need plus seam allowance. Tape a thumbtack, point side up, where the center point of your circle is. Put the outside edge of the circle under the presser foot and slowly stitch around the edge, lifting the presser foot to accommodate the curvature every few stitches. When you finish, clip a hole and turn inside out and press. Hope this helps.