
Block #7  September  Arkansas Snowflake
Making the "isotriangle units"
Numbers shown in the block above indicate the fabrics used in each.
See the fabric layout page for more
information.
In order to make the "isotriangle units" shown above in fabrics #5 and #6 you could either use a rotary cutting method, cutting from strips. Or, you could use a paper foundation piecing method.
I show both methods below.
Rotary Cutting Method
You will need a quilter's ruler that is marked for
cutting by degrees.
Below is a set of diagrams for making this entire block, since you need only plain 4.5" x 4.5" squares plus the "isotriangle units" I am showing strips for both.
The "A" illustration shows a 4.5 inch strip size used to cut the plain 4.5 inch squares.
The remaining B, C and D illustrations show the cutting for the "isotriangle unit" pieces. Each unit has 3 pieces, the center isosceles triangle and the two long sides of right triangles.
In B and C you see a 25/8" strip from which you cut 2 rectangles each 25/8" x 5.25", then cutting those in half diagonally gives 4 patches. You need to cut each of the 2 rectangles B and C in opposite directions to get the right geometric arrangement in the 4 resulting right triangles.
Then in D you see a 4.75 inch strip used to cut the center isosceles triangle. You will need a quilter's ruler that is marked for cutting by degrees as this triangle needs to be cut with 63 deg. angles in each corner.
You may want to practice cutting and sewing this triangle unit from some scrap fabric before cutting your BOM fabric.
Paper Foundation Piecing Method
I recommend getting some squared paper marked in 1/4 inch
divisions
The easiest way to make the templates for this simple 4.5 inch unit is to draw them with gridded paper. The diagram below shows the unit with a 1/4 inch seam allowance.
Just draw a line from the lower right and lower left corners of a 4" square and meet them at the top center. Then draw a 1/4 inch border around the block to show the seam allowance. Since you only need to make 8 now you may want to draw them all. But, the next block for this BOM2006 will use more of these units so you may want to make photo copies. Be sure to copy all from the SAME ORIGINAL and not make copies of copies since the size will change.
Here is the way the unit will look and the numbers indicate a suggested sewing order.
This isotriangle block is 4.5 x 4.5 before sewing with a .25 inch seam allowance.
Happy Quilting,
Susan
copyright 2006  Susan Druding
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