D9P block size question
#1
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Join Date: Dec 2009
Location: Enid, OK
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If I use 5" charms to make the 9P's, when the D9P block is cut and sewn back together, will it be 12.5" unfinished? I want to use up scraps, but I need a 12.5" unfinished block! SO not sure if I should use 4 1/2", 4 3/4", or 5" charms to make the block!
#3
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Originally Posted by BigDog
I can not believe you asked this question!!! My next project will be D9P and I've been wondering the exact same thing.
Thanks!
lol
Thanks!
lol
#6
You cut D9P twice - if you made a nine patch from 5" squares, your unfinished block would measure 14". You cut this again into quarters, yielding 4 blocks of 7" unfinished or 6 1/2" finished. I think of these as the final blocks and do my layout and join my rows using these quarter blocks but if you sewed four of them back together, you'd get a 13" finished block. If your original patches were 4 3/4", you'd get a 12 3/4" unfinished block by the above process. I'd do this then trim down, otherwise you'll be fiddling around with 1/8" :lol:
The formula is:
(size of patch x 3) subtract 1" ( 4 x 1/4" seams) = unfinished size of nine patch, then subtract 1/2" (represents 2 x 1/4" seams) = unfinished size of new block if nine patch is cut into quarters and sewn back together.
Reverse the formula to work back from your unfinished final block:
Unfinished final block + 1/2" + 1" divided by 3 = patch size so:
12.5" + 1/2" = 13" + 1" = 14" divided by 3 = 4.63", which is 4 5/8". :-D
NB - I made a mistake (see post below, this formula has been edited and is now CORRECT! - I hope! :lol: )
The formula is:
(size of patch x 3) subtract 1" ( 4 x 1/4" seams) = unfinished size of nine patch, then subtract 1/2" (represents 2 x 1/4" seams) = unfinished size of new block if nine patch is cut into quarters and sewn back together.
Reverse the formula to work back from your unfinished final block:
Unfinished final block + 1/2" + 1" divided by 3 = patch size so:
12.5" + 1/2" = 13" + 1" = 14" divided by 3 = 4.63", which is 4 5/8". :-D
NB - I made a mistake (see post below, this formula has been edited and is now CORRECT! - I hope! :lol: )
#7
Originally Posted by k3n
The formula is:
(size of patch x 3) subtract 1 = unfinished size of nine patch, then subtract 1 (represents 4 x 1/4" seams) = unfinished size of new block if nine patch is cut into quarters and sewn back together.
(size of patch x 3) subtract 1 = unfinished size of nine patch, then subtract 1 (represents 4 x 1/4" seams) = unfinished size of new block if nine patch is cut into quarters and sewn back together.
#8
Originally Posted by Thusnelda
Originally Posted by k3n
The formula is:
(size of patch x 3) subtract 1 = unfinished size of nine patch, then subtract 1 (represents 4 x 1/4" seams) = unfinished size of new block if nine patch is cut into quarters and sewn back together.
(size of patch x 3) subtract 1 = unfinished size of nine patch, then subtract 1 (represents 4 x 1/4" seams) = unfinished size of new block if nine patch is cut into quarters and sewn back together.
#9
The easiest way to calculate the D9P is to add up the 3 unfinished size blocks and subtract 2" to get the finished size. I've got a couple right here that I'm working on and measured them.
4.5" unfinished x 3 = 13.5" (finishes to 11.5" )
5" unfinished x 3 = 15" (finishes to 13" )
The only ways to get 12.5" are to cut odd sizes, or use larger squares and cut down the whole block when you are done. If what you are making doesn't HAVE to be 12.5", why create a huge headache out of it, go a little smaller or larger! :)
4.5" unfinished x 3 = 13.5" (finishes to 11.5" )
5" unfinished x 3 = 15" (finishes to 13" )
The only ways to get 12.5" are to cut odd sizes, or use larger squares and cut down the whole block when you are done. If what you are making doesn't HAVE to be 12.5", why create a huge headache out of it, go a little smaller or larger! :)
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