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Thread: quick way to create half square triangles

  1. #1
    Super Member oma66's Avatar
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    I am sure that most of you have seen this method of creating half square triangles, but perhaps those new to quilting have not. the pictures below, I hope, show how it is done very clearly. I made enough half square triangles for a full size quilt in one long afternoon - that includes cutting, sewing, ironing and squaring up the blocks.

    two squares, right sides together, sewn on all four sides
    Name:  Attachment-118842.jpe
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    cut on the diagonal
    Name:  Attachment-118844.jpe
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Size:  63.2 KB

    4 half square triangles.
    Name:  Attachment-118845.jpe
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Size:  74.3 KB

  2. #2
    Super Member DebraK's Avatar
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    That's a good one. Pictures speak a thousands word...or how ever that saying goes ;-)

  3. #3
    Super Member quiltsRfun's Avatar
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    Just be careful they don't stretch since all your outside edges are on the bias.

  4. #4
    Super Member oma66's Avatar
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    Quote Originally Posted by quiltsRfun
    Just be careful they don't stretch since all your outside edges are on the bias.
    you are so right, thanks for adding that.

  5. #5
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    Starching profusely will help that.

  6. #6
    Super Member RkayD's Avatar
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    I Love pictures..short sweet and definately to the point.

  7. #7
    Super Member Qbee's Avatar
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    OK...why have I never seen this before?? That is TOO COOL!

  8. #8
    Power Poster amma's Avatar
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    Quote Originally Posted by wolfkitty
    Starching profusely will help that.
    I agree, I would starch the fabric and then start making these like crazy :D:D:D

    Thank you for making this tute for us! :D:D:D

  9. #9
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    How do you determine the square sizes for the blocks that you want to make? For instance, if I needed 6 1/2 inch half square triangles, what size would the two squares need to be?

  10. #10
    Super Member oma66's Avatar
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    Quote Originally Posted by Tallulah
    How do you determine the square sizes for the blocks that you want to make? For instance, if I needed 6 1/2 inch half square triangles, what size would the two squares need to be?
    I cut 91/2 in squares and ended up with 6 1/2 in half square triangle blocks.

  11. #11
    Power Poster earthwalker's Avatar
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    Very clever - thank you.

  12. #12
    Senior Member sewaholic's Avatar
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    I'd forgotten about this way - thanks

  13. #13
    Super Member SherriB's Avatar
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    Do you sew all the way to the end of each side or stop at 1/4 inch and turn and go up the next side? I can't tell from the picture.

  14. #14
    Super Member oma66's Avatar
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    Quote Originally Posted by SherriB
    Do you sew all the way to the end of each side or stop at 1/4 inch and turn and go up the next side? I can't tell from the picture.
    I do both Sherri. Whatever strikes my fancy, but I usually stop 1/4 inch from the edge and turn the fabric, but it really doesn't make any difference. Have fun making the half square triangle.

  15. #15
    Super Member MadeinMaine's Avatar
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    How neat! Do you suggest the starching before sewing the edges or just before the cutting?
    Thank you for posting this.

  16. #16
    Super Member luvTooQuilt's Avatar
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    Quote Originally Posted by Qbee
    OK...why have I never seen this before?? That is TOO COOL!
    Ditto!! first time i'm seeing this.. hmmm guess i'm a newbie too then..

    Thanks for sharing!!!

  17. #17
    tooMuchFabric's Avatar
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    starch starch starch starch and then sew them together without too much delay.

  18. #18
    Power Poster CarrieAnne's Avatar
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    Thanks!

  19. #19
    Super Member oma66's Avatar
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    Quote Originally Posted by MadeinMaine
    How neat! Do you suggest the starching before sewing the edges or just before the cutting?
    Thank you for posting this.
    I do not starch before cutting or sewing, but i do starch after I make the half sq. triangles. I should say "sizing" instead of starch. I use sizing on all my pieced blocks.

  20. #20
    tooMuchFabric's Avatar
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    I use starch while the fabric is still uncut, that is to say, before there are any cut bias edges.
    When I try to starch or steam AFTER the bias edges are cut, they always become unsquared and out of true.

  21. #21
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    One could cut the squares "on the diagonal" or "on point" and then sew them - then when cut, they would have "straight" edges

  22. #22
    Super Member oma66's Avatar
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    Quote Originally Posted by tooMuchFabric
    I use starch while the fabric is still uncut, that is to say, before there are any cut bias edges.
    When I try to starch or steam AFTER the bias edges are cut, they always become unsquared and out of true.
    I will try sizing before I cut and see if I find any difference from what I am already doing. If there an advantage to doing it your way I most certainly will change. Thanks to you and to "toomuchfabric" who said the same thing. I have never had a problem, but learning from others is one of the great things about this board. Thanks again. I appreciate it.

  23. #23
    Super Member oma66's Avatar
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    Quote Originally Posted by bearisgray
    One could cut the squares "on the diagonal" or "on point" and then sew them - then when cut, they would have "straight" edges
    Have you done this? I never thought of doing it that way.

  24. #24
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    It works - the outside edges are a bit "stretchy" when sewing them - but not nearly as "stretchy" as when sewing triangles.

  25. #25
    Senior Member seymoore's Avatar
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    This is so cool! Thanks for sharing!

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