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Turn 10-inch squares into quarter square triangle disappearing quilt blocks

by Jean Boyd

Yesterday I used the laser light on the Brother Innov-ís BQ3050 to make half-square triangles. Today, I’ll use the same great feature to make quarter square triangle quilt blocks.

This is a good project for using 10″ squares (layer cakes) or using fabrics from your stash. It’s a very scrappy look, so don’t be afraid to mix and match.

Start with (12) 10″ squares – you can always make more blocks later if you like this design.

 

10″ squares ready for the quarter square triangle blocks

 

  • Turn on the laser line by pressing the laser line button.
  • Press the – button beside the laser light button until the reading is –2mm. You can move it to any position in between center and left, but –2mm is the setting needed today.

 

Press the laser line button to turn on the laser light.

 

  • Place (2) 10″ squares right sides together.
  • Sew from corner to corner on the 10″ square. This is quite a long seam, so you might like to draw a line on the fabric from corner to corner before starting to sew.
  • Place the laser light on the drawn line.
  • Start sewing, lining up the edge of the J foot with the laser line. I’ll be sewing a scant ¼” from the laser light. It takes a bit of practice to follow the laser light instead of looking at the needle, but it’s well worth it to learn this technique on the Brother Innov-ís BQ3050.
  • Stitch on both sides of the centerline.

 

Sew ¼” on both sides of the center line.

 

  • Cut the square apart on the center line to make 2 half square triangles.
  •  Press seams toward the darker fabric.

 

Cut the square apart on the center line to make 2 half square triangles.

 

  • Take 2 different half square triangles and place them right sides together, matching the seams. It doesn’t matter if the outside edges match. They’ll be trimmed later.
  • Using the laser line as a guide, sew a seam on each side of the center line, just as I did with the first 2 squares.

 

Sew 2 half square triangles together, matching seams.

 

  • Cut the squares apart on the center line and I have two quarter square triangle blocks.

This is a great technique to use for any size quarter square triangle block you need.

 

Finished quarter square triangle blocks

 

  • Using an Omnigrip ruler, trim the squares so they are 8½”. Make sure to keep the diagonal seams right in the corners when trimming.

 

Trim squares so they are 8½”.

 

Be sure to come back tomorrow to see the magic that happens when I cut these blocks up, sew them back together again on the Brother Innov-ís BQ3050 and create a completely different design!

 

This is part 3 of 5 in this series.
Go back to part 2: 1 quilt block, 3 disappearing quilt block options!

Go to part 4: Quarter square triangles make many disappearing quilt blocks

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