My quarter-inch seam is too big!

I came upon this realization after much scrutiny and 20 years of making quilts; my quarter-inch seam is just too big.

I’ve measured seams many times before, which always looked about right, I’ve read so much about the dreaded scant-quart-inch, and I’ve tried different sewing machine feet. Something was just off. After all this time, it is time I do something about it, even though I thought I had. Yes, I’ve had issues sewing blocks and rows together in quilts over the years, but I attributed it to just that is how it was. I presume it will be much easier now.

The light went on for me, when I began a new project; The Quilt Show 2020 BOM (Block of the Month) designed by the late Sue Garman. Something in her instructions demonstrated perfectly what my problem was.

In this quilt, Afternoon Delight, the instructions emphasized the importance of precision sewing, not to mention cutting, and pressing. Each has an important role to play in quilt making. I knew that. I just didn’t know I had a problem. Now I do.

There are 64 blocks in this quilt, with each measuring 7 ¼-inch. With so many blocks needed in a row, a small discrepancy could add up, making the task of assembling the quilt, difficult at best. >To insure that seams are just right, the instructions called for a practice piece to test for sewing accuracy. It suggested cutting three pieces, 1 ½ by 3 ½ inches. Sew them together. The entire set of strips should measure exactly 3 ½ inches square. If not, there is a problem. I had a problem, but I fixed it, as seen in the illustration at right.

I was a little perplexed because not only did I use my quarter-inch foot on my sewing machine, but when I measured the individual seams, they appeared to be right on the money. But when I measured the three pieces, it was too big.

This wasn’t the first time I questioned my quarter-inch-seam. I wrote about it in a prior blog post. I wasn’t sure what to do about it until I decided to simply adjust my needle position, two clicks to the right. I tried to make the three piece sample again. And, it worked! I’ve finally achieved the perfect quarter-inch seam.

I didn’t come up with this answer myself. Thanks to the Internet, and the trusted quilters of the Quilting Board, and a little sleuthing, I learned that often times, the quarter-inch seam made with the default position on the Janome sewing machine, even with the specially designed quarter-inch foot, is too big.

The default setting on the Janome is 3.5 mm. Therefore, whenever I turn on the machine, I have to remember to move my needle two clicks to the right, to 4.5 mm. to come up with the perfect seam. Perhaps it is time to write a letter to Janome asking them to change the default. I may just do that.