Making the disappearing 9 patch...
#2
Super Member
Join Date: Oct 2010
Location: Alaska
Posts: 2,356
Let me see how my math is this morning:
5 inch squares will leave 4.5" after seam allowance (4.5 x 3 = 13.5" finished square) I figured 3 across and 3 down. Now cut that again into 4 and sew back together - these squares will be 6 inch (not counting seam allowance - you will end up with a 12 inch square.
Hopefully I did my math correctly. I love using larger beginning squares for this.
5 inch squares will leave 4.5" after seam allowance (4.5 x 3 = 13.5" finished square) I figured 3 across and 3 down. Now cut that again into 4 and sew back together - these squares will be 6 inch (not counting seam allowance - you will end up with a 12 inch square.
Hopefully I did my math correctly. I love using larger beginning squares for this.
Last edited by KarenR; 06-23-2014 at 06:42 AM.
#5
Power Poster
Join Date: May 2008
Location: MN
Posts: 24,644
(assuming 1/4 inch seams and pieces are cut accurately)
A basic formula
Finished size plus 2 inches
Divide that number by 3
Example:
In the attached example, I would end up with a 4 inch finished unit.
I cut each of my squares at 2 inches (2 x 3 = 6)
I "lost" 2 inches to seam allowances
I would cut the squares 4 inches to get a 10 inch finished unit
I would cut squares 4-2/3 inches to get a 12 inch finished unit
A basic formula
Finished size plus 2 inches
Divide that number by 3
Example:
In the attached example, I would end up with a 4 inch finished unit.
I cut each of my squares at 2 inches (2 x 3 = 6)
I "lost" 2 inches to seam allowances
I would cut the squares 4 inches to get a 10 inch finished unit
I would cut squares 4-2/3 inches to get a 12 inch finished unit
Last edited by bearisgray; 06-23-2014 at 07:35 AM.
#7
Power Poster
Join Date: May 2008
Location: MN
Posts: 24,644
Let me see how my math is this morning:
5 inch squares will leave 4.5" after seam allowance (4.5 x 3 = 13.5" finished square) I figured 3 across and 3 down. Now cut that again into 4 and sew back together - these squares will be 6 inch (not counting seam allowance - you will end up with a 12 inch square.
Hopefully I did my math correctly. I love using larger beginning squares for this.
5 inch squares will leave 4.5" after seam allowance (4.5 x 3 = 13.5" finished square) I figured 3 across and 3 down. Now cut that again into 4 and sew back together - these squares will be 6 inch (not counting seam allowance - you will end up with a 12 inch square.
Hopefully I did my math correctly. I love using larger beginning squares for this.
What happens:
The original corner squares will still "finish" at 4.5
The center side cut squares lose 0.5 inch and now "finishes" at 4.0
4.5 + 4.0 + 4.5 = 13.0
#9
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