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Thread: Uneven Half-square triangles

  1. #1
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    Uneven Half-square triangles

    I am having trouble getting my half square triangles to be sewn to a regular square; they don't match exactly so the points are off. I know that you cut the half squares 3/8" bigger. So I am making 2.5 regular square and the triangle square I cut 2 7/8. But when I go to match them up to sew, they don't match--the half-square triangle which is now a square is bigger??? What is the problem? Does anyone else have that problem? What must I do?

  2. #2
    Senior Member shnnn's Avatar
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    I go bigger and trim it down. so I would cut 3" squares, cut them into triangles - sew, press, then trim down to 2 1/2 using the diagonal on my ruler to make perfect points. Or... if I was doing 2 colors only I draw a line on the diagonal and sew 1/4" on either side of it then cut on the line, press and trim.

  3. #3
    Super Member luvTooQuilt's Avatar
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    I made mine bigger then trimmed down but - wow - i still couldnt make them to save my life...

  4. #4
    Super Member Jan in VA's Avatar
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    Please check out this tutorial on making triangles easily.
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    Jan in VA
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    http://www.quiltingboard.com/members...bums19552.html

  5. #5
    Super Member karenpatrick's Avatar
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    I think you make them 7/8" bigger not 3/8". Someone will correct me if I'm wrong.

  6. #6
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    You might want to invest in the Wonder Cut Ruler. It is the best investment Inhave ever made for doing HST and I have used several methods. Using the rulers guide for your finished HSTyou cut two Fabrics and sew them together along each side and the using the rulers guides you cut almost perfect HST's. I have not seen them in quilt stores. I got mine off the Internet.

  7. #7
    Super Member Candace's Avatar
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    Check out Triangulations.

  8. #8
    Super Member Judith1005's Avatar
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    Awesome tute. thank you so much.
    Quote Originally Posted by Jan in VA View Post
    Please check out this tutorial on making triangles easily.
    My little shinning stars. Brantley, Kaylynn, and Emmalee

  9. #9
    Super Member irishrose's Avatar
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    Cut them 7/8" larger. Then make sure to line your center seam up with the 45 degree line on a ruler when you trim them to size. I've done them with only 1/2" larger, but it's too close for comfort. 1 inch is easy to measure and adds 1/8 of waste compared with the 7/8. Jan's printout is worth saving. Very nicely done, Jan.

  10. #10
    Power Poster nativetexan's Avatar
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    when you trim be sure to lay the 45 degree line on your ruler down the seam line, trim two sides and turn and trim the other two sides. that should make a perfect hst for you each time.

  11. #11
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    I always make them a little bigger then square them up with a bloc loc ruler. Perfect half-square triangles!!!!!

  12. #12
    Senior Member Candela59's Avatar
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    I have never sucessfully made one! I've tried until I've wanted either scream and/or cry!!! Sorry I can't be of any assistance here!
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    "Happiness isn't having what you want, it is wanting what you have."

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  13. #13
    Senior Member Candela59's Avatar
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    Quote Originally Posted by Jan in VA View Post
    Please check out this tutorial on making triangles easily.
    Thanks Jan! Hopefully this will help me... lol
    --------------
    "Happiness isn't having what you want, it is wanting what you have."

    www.thewanderlustgirl.blogspot.com

  14. #14
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    ...and be sure and check your seam allowance. I believe it is most important to use the scant 1/4" seam allowance.

  15. #15
    Super Member Val in IN's Avatar
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    @ Jan: That was a great tuorial! Thank you!!
    "I've always been crazy, but it's kept me from going insane!"
    Valarie

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    Super Member kiffie2413's Avatar
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    I also make mine larger, like if it says to make the squares 3 7/8", I will make mine at least 4", and often even a little larger than that. I then go on and make my hst, and then trim it to the right size. I know this wastes a little bit of fabric, but it is well worth it to me to get the hst consistently the right size...otherwise I have to try and iron them even, or go back and take them out and try and re-sew them...I actually have done the latter, before I decided much better for me to start with my squares larger.
    Good luck to you,
    Kif
    Always do right. This will gratify some people and astonish the rest~Mark Twain

  17. #17
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    I make my initial squares one inch larger than the "finished" unit size I want. This gives me 1/8" to cut away. If you still have trouble, add 1 1/4" instead. Press carefully with sizing or starch, then as NativeTexan says, use your 45* mark on your ruler. I do it exactly as she says and get perfect HSTs every time. Once you have mastered the knack, huge numbers of tricky blocks and patterns are suddenly easy. This skill is one of the important basics in lots of quilting and gives one greast joy once mastered.

  18. #18
    Super Member Grandma58's Avatar
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    I try to avoid them, they make me cry!

  19. #19
    Super Member AliKat's Avatar
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    Yep, I make mine slightly larger. Then I use my Bias Square Up Ruler to trim the HST down to size. I've never had a problem matching.

    The ruler is by That Patchwork Place/Martingale.

    ali
    Have fun quilting! If it isn't fun, you will miss a lot.
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  20. #20
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    I also think that they need to be cut 7/8 of an inch larger, not 3/8. I am sure that the difference in that measurement is your problem.
    Of all the things I've lost I miss my mind the most!

  21. #21
    Super Member Rose Marie's Avatar
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    I make them larger and use the Quilt In A Day triangle square up ruler that you only have to make one cut to square up.
    It is the best investment for a ruler I have made.
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  22. #22
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    All the reading I've done for HST, say to add 7/8 of an inch to whatever size of HST you want, I just make it an inch bigger and then square it off, so I've never had a problem. I don't know if you're cutting the triangles first or not, but I don't. If I want a 2.5" HST, I cut 2, 3.5" squares, layered, draw 2 lines diagonally, 1/4" from the direct diagonal line, sew on the 2 lines, cut on the direct diagonal line. This way, you're not sewing a cut bias edge. I hope I explained this so you can understand it.

  23. #23
    Super Member Arleners's Avatar
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    @ Jan in VA. That is a great tutorial on Triangles. I love the things you show with borders. Thanks so much for sharing!
    Arlene

  24. #24
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  25. #25
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    Use the tut here or one of the many others available on the web. Just do a search for half square triangles. If one explanation does not work for you, another will. I use my June Taylor Shape cut, but any ruler with a clear 45 degree line marked will do. Master this skill and you will be very glad you did. I taught a class at my LQS about a year and a half ago. Everyone got it without tearing out their hair. It is really just a matter of going step by step. I am grateful to the lady who taught me.

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