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Figuring the math for diagonal quilt settings!
Here is the math formula for finding out the sizes of triangles you will need for a quilt that is
set "block to block" WITHOUT sashings:
What if my quilt has SASHINGS?! What sizes do I cut?
http://www.quiltville.com
Putting it "On-Point"!!
(Click here for printer-friendly version)Figuring the math for diagonal quilt settings!
Here is the math formula for finding out the sizes of triangles you will need for a quilt that is
set "block to block" WITHOUT sashings:
- Corner Triangles
- Take the finished block size and divide by 1.414
Note: Round up to the nearest dimension on the ruler.
Add 7/8" to that number
Cut two squares the size determined above.- Cut each square in half
diagonally for the four corner triangles.
- Example #1:
Finished block size = 12"
12 / 1.414 = 8.486 (Round to 8.5 = 8-1/2")
8-1/2" + 7/8" = 9-3/8" squares to cut for Corner Triangles - Finished block size = 6"
6 / 1.414 = 4.243 (Round to 4.25 = 4-1/4")
4-1/4" + 7/8" = 5-1/8" squares to cut for Corner Triangles
- Side Triangles
- Take the finished block size and multiply by 1.414
Note: Round up to the nearest dimension on the ruler.
Add 1-1/4" to that number for the correct size to cut squares for side triangles.
Cut this square in half diagonally twice with an X to produce four Side Triangles.
Cut one square for every four side trinagles needed for the quilt setting.Example#3:
Finished block size = 12"
12 x 1.414 = 16.96 (Round to 17 = 17")
17" + 1-1/4" = 18-1/4" squares to cut for Side Triangles- Example#4:
Finished block size = 6"
6 x 1.414 = 8.48 (Round to 8.5 = 8-1/2")
8-1/2" + 1-1/4" = 9-3/4" squares to cut for Side Triangles
Example#2:
|
Common Sizes for
Setting Triangles |
||
|
Finished Block Size |
Side Triangles |
Corner Triangles |
| 3" |
5-1/2" |
3" |
| 3-1/2" |
6-1/4" |
3-5/8" |
|
4" |
7" |
3-3/4" |
| 4-1/2" |
7-
5/8" |
4-1/8" |
|
5" |
8-3/8" |
4-1/2" |
| 5-1/2" |
9-1/8" |
4-1/8" |
|
6" |
9-3/4" |
5-1/8" |
| 6-1/2" |
10-1/2" |
5-1/2" |
|
7" |
11-1/4" |
5-5/8" |
| 7-1/2" |
12" |
6-1/4" |
|
8" |
12-5/8" |
6-5/8" |
| 8-1/2" |
13-3/8" |
6-7/8" |
|
9" |
14" |
7-1/4" |
| 9-1/2" |
14-3/4" |
7-5/8" |
|
10" |
15-1/2" |
8" |
| 10-1/2" |
16-1/8" |
8-3/8" |
| 11" |
16-7/8" |
8-3/4" |
| 11-1/2" |
17-1/2" |
9-1/8" |
|
12" |
18-1/4" |
9-3/8" |
| 12-1/2" |
19" |
9-3/4" |
| 13" |
19-3/4" |
10-1/8" |
| 13-1/2" |
20-3/8" |
10-1/2" |
|
14" |
21-1/8" |
10-7/8" |
| 14-1/2" |
21-3/4" |
11-1/8" |
|
15" |
22-1/2" |
11-3/8" |
| 15-1/2" |
23-1/4" |
11-7/8" |
|
16" |
23-7/8" |
12-1/4" |
*Note*
I like to round my
numbers up a bit when cutting the squares for side triangles. For
instance, if your closest fraction is 1/8", I personally would round it
up to the 1/4". If the closest fraction is 3/8", then I would round it
up to the 1/2". The blocks will float inside the top a bit
when pieced with bigger triangles, but I trim it down after the top is
together.
Lay out the triangles and corners with your blocks. Begin sewing the quilt into rows starting at one corner. Your first row will have one corner block, two large setting "wing" triangles, and the corner triangle. Your second row will have three blocks, two wing triangles...etc. Each row will get larger as you get to the center of the quilt. I like two assemble the quilt rows together as I go until there are two halves of the top.....and then sew the two halves together in one long seam.
Lay out the triangles and corners with your blocks. Begin sewing the quilt into rows starting at one corner. Your first row will have one corner block, two large setting "wing" triangles, and the corner triangle. Your second row will have three blocks, two wing triangles...etc. Each row will get larger as you get to the center of the quilt. I like two assemble the quilt rows together as I go until there are two halves of the top.....and then sew the two halves together in one long seam.
After the top is
together, use your ruler and rotory cutter to
trim the edge of the quilt 1/4" away from the corners of the blocks at
the quilt top edge. This gets rid of all the dog ears from sewing the
rows together too.
What if my quilt has SASHINGS?! What sizes do I cut?
The side and corner
triangles need to be cut using the same calculations above, only we now
add the sashing measurement to the block measurement as one unit.
The sashing is considered to be part of the block when calculating the
side and corner triangles. Say you have an 8" finished block size, but
you are setting the quilt with 2" finished sashing. You would figure
that you need setting triangles for a 10" finished block size (8" block
+ 2" sashing) to set your quilt.
Questions
or Comments? I would love to hear from you!! © Bonnie K Hunter & Quiltville.com 1997-2011 All Rights Reserved. No part may be used, copied, sold, distributed or otherwise
altered without express written permission from the author/webmaster.