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Thread: one square block into a pinwheel?

  1. #1
    Junior Member
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    I have enjoyed the you tube video to make pinwheels from two squares sewn together a 1/4 inch all the way around the outside edge. I would like to have a chart that shows you what size blocks to start with to end up with a 5 inch pinwheel and a 6 inch pinwheel. Can any help?

  2. #2
    Power Poster erstan947's Avatar
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  3. #3
    Super Member gramajo's Avatar
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    Quote Originally Posted by erstan947
    This only goes up to 7". I want to know what size to cut for a 10" (10 1/2" with seam allowances) block. Can anyone help?

  4. #4
    Super Member bibliostone's Avatar
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    On the last 4 measurements she gave, there was a difference of 3 inches between the square she started with and the ending size. So I would try 14 inches and see if that is slightly too big. Easier to make it smaller than make it bigger. If 14 is too big, try 13.

  5. #5
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    When we were doing the pinwheel project a member, Ceil, came up with this formula that works!
    "Whatever your block side is subtract .5 then multiply by 1.4 then subtract .5. "

    Starch or sizing the fabric is a must before you cut out the squares.

    So you would have:

    to end with a 6" block
    Start with 2 5.5 inch squares
    5.5 minus .5 = 5
    5 x 1.4 = 7
    7 Minus .5 = 6.5 unfinished block = 6" finished

    To get a 5"
    Start with 2 5 inch squares
    5 - .5 x 1.4 - .5 = 5.8 trim to 5.5 unfinished = 5" finished

    Try it on some scrap fabric.
    If your seams are a true 1/4" it should work.

    HTH

  6. #6
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    Quote Originally Posted by gramajo
    Quote Originally Posted by erstan947
    This only goes up to 7". I want to know what size to cut for a 10" (10 1/2" with seam allowances) block. Can anyone help?
    You would start with 8.5"
    8.5 -.5 x 1.4 - .5 = 10.7 trim to 10.5

    Test it with scrap material!
    Starch the fabric before cutting since you are working with bias edges.
    HTH

  7. #7
    Senior Member stitchengramie's Avatar
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    Quote Originally Posted by susiequilt
    When we were doing the pinwheel project a member, Ceil, came up with this formula that works!
    "Whatever your block side is subtract .5 then multiply by 1.4 then subtract .5. "

    Starch or sizing the fabric is a must before you cut out the squares.

    So you would have:

    to end with a 6" block
    Start with 2 5.5 inch squares
    5.5 minus .5 = 5
    5 x 1.4 = 7
    7 Minus .5 = 6.5 unfinished block = 6" finished

    To get a 5"
    Start with 2 5 inch squares
    5 - .5 x 1.4 - .5 = 5.8 trim to 5.5 unfinished = 5" finished

    Try it on some scrap fabric.
    If your seams are a true 1/4" it should work.

    HTH
    Thank you for posting this. I found it very helpful.

  8. #8
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    One thing I discovered using this method was This gives you the size one on the 4 pinwheel blocks, then you put them together to make your pinwheel or what other shape/ pattern you want. I was trying to make a 4" pinwheel, followed the above for a 4" block and ended up with an 8" pinwheel once all pieces were put back together. So you want your "block" to be 1/2 of the finished pinwheel size. 10" pinwheel would use 4 5" blocks. (Just rough measurements as an example) When you are cutting up your square you are making 1/2 sq triangles not the pinwheel. The pinwheel comes from the 4 cut blocks re sewn.

    http://www.moonlightquilters.org/tipHSTfav.htm

    Is another site with sizes for the HST.

    I'm still new at this but it was something I learned the hard way.

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