To celebrate the Triangle Transparency quilt pattern release, I want to share a half-square triangle (HST) piecing tip that helped me chain piece the quilt top together quickly. The Triangle Transparency quilt studies transparency using an overlay of triangular shapes. Block construction is achieved using Half Square Triangles (HSTs) and strip piecing to quickly create a 60″ by 60″ lap quilt.
There are several different methods to make HSTs, and I prefer to create oversize units and trim them back to their exact unfinished size. I have found this allows me much higher piecing accuracy during block construction. The method I am going to describe creates 2 HSTs of one color combination at once and is the basis for the cutting instructions in this pattern.
HST Step 1
Place (2) fabric squares right sides together with the lightest fabric on top. On the wrong side of the lightest fabric, mark one diagonal line from corner to corner.
HST Step 2
Sew a quarter inch seam allowance on either side of the marked diagonal line. BEFORE you mark extra lines to sew along to create your quarter-inch seam allowances, check out the tip below!
HST Seam Allowance Piecing Tip
Tip: Check to see if moving your needle all the way to the right and sewing with the marked line centered creates a scant quarter inch seam allowance.
The next thing I tried was to adjust the reference point that I used to sew down the marked centerline. Instead of keeping the marked centerline centered under my presser foot, I used the inside “notch” on the left hand side of the presser foot as a guide.
As a reference, I sew on a Bernina and used my 1D foot.
The offset needle in combination with offset reference point for sewing along the marked centerline created beautiful quarter-inch seam allowances and reduced the amount of time I spent preparing my fabric squares for piecing!
HST Step 3
Cut into (2) triangles along the marked diagonal line.
Tip: Iron the blocks to set your seams prior to Step 3.
HST Step 4
Press the HST seams open. Trim square to the desired unfinished size.
Tip: Use a square grid ruler with 1/2″ grid increments to make trimming HSTs to size quick and easy.