After finishing the tutorial for one of the Floral Sketches BOM blocks that was composed of hourglass blocks yesterday I thought that it may be a good idea to share some quick reference charts I made for myself to determine the size of pieces to cut.
- Cut 2 strips each 2 1/2 inches wide, one from each of your fabrics. You can stack your strips if you wish
- Using your quarter square ruler line up the 2 1/2 line on the ruler with the lower edge of the strip
- Cut the triangle
- Flip the ruler over and cut another triangle
- For one hourglass block you need to cut four triangles, two from each colour strip
- Pair up adjoining triangles, stitch. I always stitch from the long outer edge to the centre of the triangles.
- Set the seams and press the seams towards one colour
- Pair up both triangle units matching the centre seam. The seams should nest together nicely. Stitch. Set the seam and press well.
This methods makes 2 blocks at a time
Place your fabrics right sides together
Mark in the diagonal on the top square as shown
Flip one of the half square triangle units over and draw another line on the diagonal that is perpendicular of that unit as shown.
Once again stitch 1/4 inch each side of the line you have drawn in.
We now need to trim the units down to the correct size.
Lay one of the hourglass units face up on your cutting mat. You need to use a square up ruler or your cutting ruler with a 45 degree line.
Place your ruler on top of your unit so that the 2 1/2" lines are on the centre of the unit square and the diagonal line (45 degree) on the ruler is on the sewn diagonal line of your unit. ( Mine is a bit off, trying to take a pic and hold the ruler all at once can be difficult at times)
Trim off any section along the top and sides of the ruler that extends out
If you wish to make hourglass units with many different colours you can:
- If you do have a quarter square triangle ruler you can cut strips as described in Method 1 from the two colours
- If you do not have a quarter square ruler determine the square size you need to cut sqaures as you do in Method 2. For example to make the 4 inch finished hourglass block I would 5 1/4 in squares. You then cut the square into 4 pieces across one diagonal and then across the other to yield four squares the same.