These blocks come from this book, and I'm making them in blues, greens, and grays.
I started these blocks in January using my old sewing machine, and then bought the new one in February. As the weeks have gone by, and I've made other blocks, I've been starting to think that maybe the 1/4 inch stitching mark on the machine is not accurate. So I decided I'd better do a test block!
I made a 4 patch using 2.5 inch squares, and...
It was about 1/16 of an inch too small!
Then I lined up a small ruler under the presser foot with the 1/4 inch mark up against the needle.
Yep - it's about 1/16 inch off! Darn it!
Well, since I want my Northern Lights blocks to accurately finish at 8.5 inches, I decided I'd better adjust my seam allowance. These blocks are made from two 4 patches and 2 HSTs. The HSTs came out a little big and just needed a little trimming - no problem there!
The 4 patches are made by matching up a print 5 inch square with a background 5 inch square, and sewing on two opposite sides. You then cut them in half like this -
Match up opposite colors - and sew opposite sides again. (top and bottom in this photo)
Using a "scant" 1/4 inch seam (according to my machine's marking), I ended up with the 4 patches being a smidge big this time, and needing a little trimming. Better that than too small!
And the new blocks are just right!
Oh, I like this design!
Those two dark looking blocks are actually a dark green and a dark blue.
So, here's my question? Do I trust myself to remember that scant seam allowance - or should I mark it on my machine in some way? Have you had to do this on your sewing machine? How have you done it? Thanks, quilty friends!
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