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Thread: HST Formula

  1. #1
    Shiny Thimble

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    Default HST Formula

    Hi
    Does anyone know how I can apply Jenny's fast hst technique to other sizes of blocks? The method I am speaking of is where Jenny takes two blocks, sews entirely around the perimeter and then cuts diagonally to yield multiple blocks. I am particularly interested in how to accomplish this technique for a pattern which calls for cutting a block 3 7/8 inches to arrive at a 3 inch finished block. Is there a general rule of thumb?
    Thanks!
    Sue

  2. #2
    Missouri Star

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    Default Re: HST Formula

    I think with that method you add one inch to the size you want the finished block to be, so 3" +1" = 4. Cut your two squares 4", sew around the perimeter, do your criss cross cut and your new square should be 3". If a pattern calls for 7/8 in the measurement I cut to the next full inch and square up. Easier to modify a block slightly too big than short. I am no math genius but this is how I would do it. Other people who are more technically minded and really good at math might say my answer is wrong. So I would advise making and measuring a test block from scraps first. And wait and see how many other answers you get here.

  3. #3
    Missouri Star

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    Default Re: HST Formula

    HSTs using Jenny's method - beginning and ending sizes. You can trim down the HSTs to make the size you need (though that would be an extra step).
    2 squares = 4 HSTs
    2" Square = 1.06" HSTs
    2.5" Square = 1.41" HSTs
    3.0" Square = 1.77" HSTs
    3.5" Square = 2.12" HSTs
    4.0" Square = 2.47" HSTs
    4.5" Square = 2.83" HSTs
    5.0" Square = 3.18" HSTs
    5.5" Square = 3.54" HSTs
    6.0" Square = 3.89" HSTs
    6.5" Square = 4.24" HSTs
    7.0" Square = 4.60" HSTs
    7.5" Square = 4.95" HSTs
    8.0" Square = 5.30" HSTs
    8.5" Square = 5.66" HSTs
    9.0" Square = 6.01" HSTs
    9.5" Square = 6.36" HSTs
    10.0" Square = 6.72" HSTs
    10.5" Square = 7.07" HSTs
    11.0" Square = 7.42" HSTs
    11.5" Square = 7.78" HSTs
    12.0" Square = 8.13" HSTs


    And going the other way - what size original squares are needed to end up with certain size HSTs:
    #" Squares (2) = #" HSTs (4)

    1.7" Squares = 1.0" HSTs
    2.4" Squares = 1.5" HSTs
    3.1" Squares = 2.0" HSTs
    3.8" Squares = 2.5" HSTs
    4.5" Squares = 3.0" HSTs
    5.2" Squares = 3.5" HSTs
    5.9" Squares = 4.0" HSTs
    6.6" Squares = 4.5" HSTs
    7.3" Squares = 5.0" HSTs
    8.0" Squares = 5.5" HSTs
    8.7" Squares = 6.0" HSTs
    9.4" Squares = 6.5" HSTs
    10.1" Squares = 7.0" HSTs
    10.9" Squares = 7.5" HSTs
    11.6" Squares = 8.0" HSTs
    12.3" Squares = 8.5" HSTs
    13.0" Squares = 9.0" HSTs
    13.7" Squares = 9.5" HSTs
    14.4" Squares = 10.0" HSTs
    15.1" Squares = 10.5" HSTs
    15.8" Squares = 11.0" HSTs
    16.5" Squares = 11.5" HSTs
    17.2" Squares = 12.0" HSTs
    *~* Myrna *~*
    *~* Quilters lead pieceful lives *~*

  4. #4
    Applique Angel

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    Default Re: HST Formula

    Phew, those are two really impressive charts. I believe you just have to be careful ironing your HSTs made this way since there'll be some bias. Anyone can correct me if I'm wrong...

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