Friday, October 10, 2008
Squaring up the Quarter Square Blocks
all of the quarter square blocks in the curent Quilt for an Hour project will need to be squared up to 3 1/2 inches to match the size of the center star square. to do that we need to find the center point both visually and mathmatically. Dividing 3 1/2 inches by 2, we arrive at a figure of 1 3/4 inches, the mathmatical center of the block.
to find the visual center, we need to put the 45 degree angle of the ruler on top of the diagonal seam line. With each cut both of these measurements will be used. and with each succesive cut an additional check will be the allignment of the previous cut.
So on these blocks let's start by squaring up one of the star points (C).
1. put the 1 3/4 mark on your ruler at the center of your block where the triangles come to a point.
2. slide your ruler up or down so that the 45 degree angle mark of your ruler is on top of the seam line.
3. make your first cut on the right hand side of the block.
4. rotate your block and square up the second star point(C). we will be working on opposite sides when squaring up this block.
5. next we square up the remaining two sides. Rotate you block a quarter of a turn to fabric B. Notice that you now have an extra check point in the squared side of fabric C that you can use to determine if everything is square. make your cut.
6. rotate your block one last time and make your cut on fabric F. by this time you will have additional check points at the top, left, and bottom of your block.
and here is your quarter square block all finished, and measuring 3 1/2 inches square.