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Thread: D9P block size question

  1. #1
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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!

  2. #2
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    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

  3. #3
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    Quote 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
    now we just have to hope somebody has the right answer! :lol:

  4. #4
    Senior Member 4dogs's Avatar
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    I havent tried this yet (on my to-do list) but if you just subtract a quarter inch for each seam in a side, that should give you the final size (did that make sense?)

  5. #5
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    I believe that would make it 14", or 13.5" finished. 4.75" would be 12.75"

  6. #6
    k3n
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    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: )

  7. #7
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    Quote 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.
    Wouldn't you get the finished size if you subtract 1 again after cutting for the second sewing? For the unfinished block you only need to substract 1/2 inch, as there are only two seem allowances per block direction.

  8. #8
    k3n
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    Quote Originally Posted by Thusnelda
    Quote 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.
    Wouldn't you get the finished size if you subtract 1 again after cutting for the second sewing? For the unfinished block you only need to substract 1/2 inch, as there are only two seem allowances per block direction.
    You're absolutely right - I just went off to make coffee and it occurred to me that there was now one seam not two. So I came back to edit and saw your post. :lol: I'll edit mine above so as to not confuse anyone. :-D Although THIS post will then confuse them! Sorry, it's early morning here and my brain isn't up yet! :lol:

  9. #9
    Super Member katier825's Avatar
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    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! :)

  10. #10
    Super Member Connie in CO's Avatar
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    I have a 1/4 block that i didn't use and it's measures 7 inches unfinished,so it would measure 13 inches with all 4.sewn together.Connie CO

  11. #11
    Super Member irishrose's Avatar
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    I'm relatively sure my blocks made with 5" squares were 13.5", so 4 2/3" makes sense to come close to 12 1/2".

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    My daughter is a high school math teacher. I ask her hard questions like this one.....

  13. #13
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    Quote Originally Posted by katier825
    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! :)
    I was hoping to use these with some star blocks..I think I will be fine if I just trim them down when they are finished...

    Thank you all for helping figure this out!

  14. #14
    Power Poster debcavan's Avatar
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    If you sew a nine patch using 5" squares your nine patch will measure 14" unfinished. So if you measure in 6 1/2 inches and cut from all edges you will have a little excess in the center to throw away. But you will have a block of 12 1/2 inches unfinished when you sew four of them together.

    (Actually I would put my ruler to cut on the seam line of the nine patch so I would be putting my ruler so I cut 2" past the seam line (that would be the seam along the center block). That way all those small blocks are exactly the same size.) To make sure you are in the same area or understand what I am saying. Turn the block upside down and measure in 6 1/2 inches in and mark it with a pencil. Now measure from the seam 2" and you will see they are the same thing. Only if there are irregularities when you sew your nine patch, lining up your ruler on the seam is more accurate.


    I saw a question on the board why the little blocks didn't line up in someone's patchwork, the above suggestion will illiminate that.

    The fiinished size (after the block is sewn in quilt top) of the big patch will be 4 1/2" and the small strip and small block will be 1 1/2. That totals to a finished 6" block or a finished 12" block of four put together or a 12 1/2 unfinished block of the four put together.


    Certainly you can cut down the blocks before, but why

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    would love to see the progression of block as its cut if anyone wants to show ics - thanks cheryl :thumbup:

  16. #16
    Power Poster blueangel's Avatar
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    Sounds logical.

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