The secrets to accurate Half Square Triangles by Paul Leger January 10, 2022 written by Paul Leger January 10, 2022 409 When posting on social media, one never knows what kind of reactions the post will get. Case in point, a few weeks ago I posted a photo of my construction process for multiple half-square triangles (HSTs) using single strips of fabric. That post produced many questions on the technique I used. Coincidentally, at the same time, I was asked to write this week’s post and what topic I would choose to write about. Well, without missing a beat, I replied that I’d like to write about the various techniques to use when making HSTs. To make this week’s quilt, I’ll use some of my favorite Clover notion and tools. CLOVER Quilting Pins – 48mm (17⁄8″) CLOVER Wonder Clips CLOVER Thread Cutter Pendant CLOVER Chaco Liners CLOVER Rotary Cutter – 45mm (13⁄4″) GÜTERMANN 26 pc Cotton Thread Set with Storage Box Clover quilting notions and tools Here’s a look at the quilt I’ll be working on this week. It measures 48” x 60” – the perfect size for my neighbor’s newborn son. This week’s Marvel Avengers Kids in Action quilt project measures 48” x 60” when complete. The accent fabric I selected is called Marvel Avengers Kids in Action, available at your local quilt store. I matched this accent fabric with solid colors I already had in my stash. Here are the fabric requirements for this week’s quilt: ¾ yard [0.7m] Marvel Avengers Kids in Action accent fabric ⅞ yard [0.8m] each of two different fabrics for HSTs (blue and red) ⅝ yard [0.6m] each of two different fabrics for Quarter Square Triangles (yellow and green) ½ yard [0.5m] for binding 3 yards [2.75m] for backing Marvel Avengers Kids in Action with complementary solid color fabrics. Today, I’ll demonstrate one of the three methods I use to make HSTs. This method takes us back to the basics. There are two HSTs on each side of the accent fabric and quarter squares in all four corners of the block. On Thursday I’ll demonstrate my go-to method to make Quarter Square Triangles. 20 blocks are required to make this quilt. Each block measures 12” x 12” finished. Completed blocks Each HST measures 3” x 3” when finished. When cutting the fabrics for the HSTs, always add ⅞” to the finished size. In other words, cut the fabrics into squares measuring 3⅞” x 3⅞” each. If everything is perfect (the cutting, the marking, and the sewing), these measurements result in 3½” x 3½” unfinished HSTs. In my case, while I strive for it, the result is never perfect. So, I prefer to err on the side of caution and cut 4” x 4” squares and trim after sewing. Yes, the trimming means taking an extra step but the resulting HSTs are perfect! From the two fabrics I’m using for the HSTs, I cut 4” wide x width of fabric (WOF) strip. Then, I sub-cut each strip into 4” x 4” squares. I get 10 squares measuring 4” x 4”. Cut 4” x 4” squares from a 4” x WOF strip of the blue and red fabrics. Before going on to the next step, I’ll show you the marking tools I’m using this week. I often use Clover Chaco Liners. Why? Because I love the fine line they make, and the line easily rubs off the fabric with no effort. They come in regular and pen styles in white, silver, blue, yellow, or pink. Once empty, there are refills available for both liner styles. Note: Although I’ve never had issues with Chaco Liners, all fabric marking tools should be tested on the fabrics to ensure the marks left will brush or wash off. Chaco Liners by Clover. Now, onwards! For the next step, pair red and blue fabric squares, right sides together. Using a Chaco Liner, draw a diagonal line on the wrong side of one of the paired fabric squares. With lines drawn, sew a ¼” seam on each side of the diagonal line for each pair. Note: Unless otherwise mentioned, all seams this week are ¼”. Draw a diagonal line from corner to corner on the wrong side of the fabric and sew a ¼” seam on both sides of the line. After sewing all seams, cut along the diagonal line, press open and trim the result to measure 3½” x3½”. Cut sewn squares along the diagonal line, press seams open and trim to 3½” x 3½”. Today, I introduced Clover Chaco Liners. They come in five colors, so there’s always a color that will be visible on any fabric. They are easily applied and equally easily removed after the seams are sewn. Tomorrow, I’ll demonstrate using the Chaco Liner again as I feature another HST-making technique! This is part 1 of 5 in this series Go to part 2: 5 easy steps for making multiple Half Square Triangles at once! Print this page or save as a PDF 0qs398Clover 45mm Rotary CutterClover 48mm Quilting PinsClover Chaco LinersClover Seam RipperClover Thread Cutter Pendantclover wonder clipsfabricsMarvel Avengers Kids in Actionnotions FacebookTwitterPinterestLinkedinRedditWhatsappTelegramEmail Paul Leger I took my first quilting course in September 1994 in Barrie, Ontario, near the armed forces base where I was stationed. After moving to Ottawa in 1996, I joined my first guild. I took more courses and began to buy quilting books and lots of fabrics. Quilting has become my passion. I have made over 150 more quilts since then, and have never looked back. I now share my knowledge of quilting by teaching and doing presentations, and blogging! previous post Spectrum QAL Block 9 with Pam Voth: Delightful Collection by Riley Blake next post 5 easy steps for making multiple Half Square Triangles at once! YOU MAY ALSO LIKE... Make a strap adjustable with a slide buckle The easiest way to add a magnetic closure... 12 easy steps to sew a zippered pocket... 2 ways to make fabric waterproof with Odif... 6 easy steps to making a strong strap... Use Odif Odicoat to waterproof your quilted project... IF Odif 909 is permanent, why is it... Odif Iron Cleaner to give a dirty iron... When quilting, Odif 606 is a great alternative... 4 comments Carol Jones-Packwood January 10, 2022 - 5:31 pm Where do you buy the Clover markers? Reply Paul Leger January 10, 2022 - 5:36 pm Hi Carol, I get them at one of my local quilt shops. Reply Alison January 10, 2022 - 1:06 pm In the last step for trimming the hst should it be trimmed to 3.5 to finish in the quilt at 3”? Reply Paul Leger January 10, 2022 - 2:02 pm Thanks Alison for picking that up. I’ll get it corrected. Reply Leave a Comment Cancel Reply Save my name, email, and website in this browser for the next time I comment. Δ This site uses Akismet to reduce spam. Learn how your comment data is processed.