Next page: Assembling a Set-In Seam by Machine
With set-in seams, the piece to be added is stitched into the unit in two steps. Diamond blocks frequently contain set-in squares and triangles. Joining stitches for these pieces run from marked dot to marked dot and do not extend into seam allowances.
Transferring Dots to Fabric Pieces
To ensure that the pieces fit together accurately, the pattern templates should have dots marked on the 1⁄4" seam line at the outer and inner corners. To transfer those dots to the fabric pieces, first pierce a small hole through each dot on the template with a large needle or awl. Make sure the hole is just large enough for the point of a fabric pen or pencil. Align the template over the wrong side of the fabric piece and mark through the holes.
Starting a Set-In Seam by Machine
Seams that begin away from the fabric edge need to be secured with a few backstitches.
Begin sewing forward at the dot for a couple of stitches, take a couple of backstitches, and continue sewing to the opposite edge or dot. Avoid the urge to backstitch too far. You do not want to go past the starting point. Too many layers of thread will add unnecessary bulk to the finished seam. Stitching forward, backstitching, and stitching forward again gives the beginning part of the seam three layers of thread.
1. Turn your work so the starting dot is 1⁄4" in front of the needle. Stitch forward to the dot.
2. Leaving the needle in the fabric, pivot the work 180º and continue sewing the seam. With this method, there are only two layers of thread in the beginning part of the seam.
Ending a Set-In Seam by Machine
Seams that end away from the fabric edge need to be secured with a few backstitches.
Stop sewing forward at the dot and take a few backstitches.
1. Stop sewing forward at the dot. Leave the needle in the fabric at the dot and pivot the work 180º.
2. Take a couple of stitches forward on top of the previous stitching.