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Thread: Quilter's Math - UGH ! ! ! Help Please ! ! !

  1. #1
    Junior Member Groovy Pieces's Avatar
    Join Date
    May 2013
    Scrap Bag, NC

    Unhappy Quilter's Math - UGH ! ! ! Help Please ! ! !

    Hi All . . .

    Working from "Patchwork: Comforters, Throws, & Quilts" Published by House of White Birches & edited by Stauffer & Hatch" page 68-71.

    Found this wonderful fabric with embossed gold/mettalic flower oblongs that measure 7-5/8" X 8-3/8". Decided to cut them down to 7" squares (I'll get more than enough of the design & refuse to go out of my mind over 1/8" intervals). Now. . . here's the equation:

    What would be the setting triangles & the corner HST. . . . these are the book measurements:

    Decorative A squares: 10" - mine will be 7"
    Setting Triangle B squares: 14-3/4" - What would mine be?
    HST corner C squares: 7-5/8 - What would mine be?

    What would the B & C squares measurements be? Or is it possible just to subtract 3" from all measurements (since I cut the original 10" to a 7")? Please forgive the simplicity of this question, but I need guidance from all you veterans out there to make my life easier.

    My utmost thanks in advance for all the great advice.
    Create A Great Day ! ! ! !
    MQB-3 / RAB-2 / Booms 11 & 13 / Projects

  2. #2
    Power Poster dunster's Avatar
    Join Date
    Mar 2009
    Lake Elsinore, CA
    This page explains setting and corner triangles - http://quiltville.com/onpointmath.shtml - remember to use your FINISHED block size when using the table. I'm not sure whether you mean that you cut your fabric into 7" squares (so 6.5" would be the finished size) or 7.5" squares (so 7" would be the finished size). In the example from the book, the finished block size was 9.5" and the squares were cut (unfinished) at 10".

  3. #3
    Super Member mom-6's Avatar
    Join Date
    Feb 2010
    I find it easiest to put the design on graph paper as the original and then work out the new dimensions below it. Much less math involved!

  4. #4
    Super Member eparys's Avatar
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    Sep 2008
    New England, USA
    So ... The original ones would be a cut 10" sq (finished up at 9.5) with a cut 14.75 setting triangle so ... at a cut 7" (finished up at 6.5) square for Dec A the setting triangle would be cut at 10.5" then cut on the diagonal both ways (like an X ). When I do setting triangles I always cut them larger (I would cut min of 11" sq here ). As far as the HSTs ?? I assume that you are referring to the corner setting triangles / for a 6.5" finished sq, those would be cut at 5.5" with one cut on the diagonal .

    A quilt will warm your body and comfort your soul.


  5. #5
    Senior Member
    Join Date
    Nov 2011
    Central Missouri
    Groovy, I have a wonderful reference book called All-in-one Quilter's Reference Tool by Harriet Hargrove, Sharyn Craig, Alex Anderson and Liz Aneloski which I was able to put my hands on. I'm taking your 7 inches as a finished size, which would make setting triangles (side) cut at an 11.25 inch square. Your corner triangle will start as 5-7/8 inch squares (I'd make them 6 and trim down the sides before putting on the borders. If your 7 inch block is NOT finished (making a 6.5 inch finished block) your setting squares would need to be 101.5 inches and corner squares at 5.5 inches. Good luck! Hope this helps.

    Linda in Missouri

  6. #6
    Join Date
    Mar 2010
    Sturbridge, Ma
    I would draw on graft paper and then measure. Would be more accurate in the long run.

  7. #7
    Super Member Jan in VA's Avatar
    Join Date
    Aug 2010
    Piedmont Virginia in the Foothills of the Blue Ridge Mtns.
    Quote Originally Posted by Holice View Post
    I would draw on graft paper and then measure. Would be more accurate in the long run.
    I swear I just believe you and I are among the "old-timey" quilters who 'came up' in the early 80s when all we *had* were our colored pencils, 6" rulers, and graph paper pads for designing our own blocks and quilts. I'm beginning to feel like a dinosaur every time I urge someone, even a 65 year old, to use this method for figuring out measurements and designs. I'm getting to the place that I'm just going to keep this great tip to myself from now on!

    Jan in VA
    Jan in VA
    Living in the foothills
    peacefully colors my world.

  8. #8
    Power Poster nativetexan's Avatar
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    Feb 2009
    home again, after 27 yrs!
    Blog Entries
    No, don't do that Jan. I still draw things on grid paper.

  9. #9
    cjr is offline
    Super Member cjr's Avatar
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    Jul 2010
    Las Vegas NV
    I.ve only been quilting about 5 yrs. i did not start until I retired at age 67. I do blocks on graf paper as well as design my quilts. I have made my own with 1/2" blocks that seem easier to use then preprinted graf paper. Limited budget, so I figure it out best I can. So far all my quilts have 90 degree corners.

  10. #10
    Super Member GailG's Avatar
    Join Date
    May 2008
    Quote Originally Posted by nativetexan View Post
    No, don't do that Jan. I still draw things on grid paper.
    So do I!! I print graph paper from the internet and plot it out. Sometimes guess-timating. Just so it's cut a little bigger. Easy to square up. No quilt police around here.
    One step at a time, always forward.

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