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Thread: formula for correct hourglass block size

  1. #1
    Super Member AlwaysQuilting's Avatar
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    I want to make hourglass blocks that are 5.5" (5" finished).
    I know to make HSTs you cut your fabric 7/8" larger.
    But I seem to remember that if you're making an hourglass you need to cut the fabric even larger?
    I'm thinking 1.25" larger. Am I correct?
    My brain cells aren't what they used to be and I couldn't find the formula (if there is one) online.
    Thanks

  2. #2
    Moderator kathy's Avatar
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    yes, you are correct

  3. #3
    Super Member AlwaysQuilting's Avatar
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    thanks for the quick reply.
    Now I can start cutting!

  4. #4
    Power Poster MadQuilter's Avatar
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    Quote Originally Posted by AlwaysQuilting
    I know to make HSTs you cut your fabric 7/8" larger.
    If you cut them 7/8" larger you have to be extrememly careful with the cutting, sewing, and pressing or your HSTs may be too small. Many of us cut the square 1" larger and trim the HSTs. More work but better results.

    Oh, and good luck with your hour glass.

  5. #5
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    I just finished making some this afternoon. I wanted a finished 6" block. So I cut two squares of contrasting fabric 7 1/2 in.l placed them right sides together. Then I drew aline diagonally across the fabric and sewed 1/4 inch on either side. Then I cut it down the middle and ironed it opened. Then I placed the sq. right side together again with oppisite sides facing and drew another line diagonally and sewed again down both sides and cut it iin half. Opened it up, pressed and squared it up to 6 1/2 inches. Perfect hour glass.

  6. #6
    Super Member AlwaysQuilting's Avatar
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    Quote Originally Posted by mic-pa
    I just finished making some this afternoon. I wanted a finished 6" block. So I cut two squares of contrasting fabric 7 1/2 in.l placed them right sides together. Then I drew aline diagonally across the fabric and sewed 1/4 inch on either side. Then I cut it down the middle and ironed it opened. Then I placed the sq. right side together again with oppisite sides facing and drew another line diagonally and sewed again down both sides and cut it iin half. Opened it up, pressed and squared it up to 6 1/2 inches. Perfect hour glass.
    Thanks for the tute.
    This is how I planned on making mine too but I forgot to mention it.
    I didn't want to make a bunch of HSTs and then sew them together. Too slow.
    I probably will cut the fabric larger than the needed amount also. Just safer that way, isn't it?

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