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Thread: cutting triangles so there is no bias

  1. #1
    Senior Member grammatjr's Avatar
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    Question cutting triangles so there is no bias

    Last night as I was falling asleep, I was watching Fons & Porter - the one with Joseph's Pinwheels.

    They said something about cutting quarter triangles and half triangles, so that the bias is not where............. getting really drowsy. LOL

    Anyway, they said cut them so they don't have the bias on one side, so you don't stretch it out. And they told how big a square to cut out, based on the block it is being attached to. It all made sense as I was falling asleep, but now I can't remember exactly what was said. And it seemed so much more clear than I had ever heard it before.

    Do you know what they said?

  2. #2
    Super Member valleyquiltermo's Avatar
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    Maybe it is where you put 2 squares right sides together, sew a 1/4 inch seam around the outside of the sq,
    and then cut them through the middle from bottom left corner to right top corner then again from bottom right corner to top left corner??
    Last edited by valleyquiltermo; 11-09-2011 at 01:53 PM.
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  3. #3
    Super Member Krisb's Avatar
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    Wasn't watching, but here's what I know. You should not ever have the bias edge on what will be the outside of the block, unless you enjoy self-punishment. The outer edges should be on the straight grain. My solution is to buy triangles on a roll, because accurate measurements are right up with an accurate seam allowance of my list of challenges.
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  4. #4
    Super Member Stitchnripper's Avatar
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    What about drawing a line down two squares which have been put right sides together. I think you are supposed to make them 7/8 of an inch bigger than your finished size, but I always round up to an inch. Then you sew 1/4 inch away from line line on each side and cut them apart on the line. Also, Rhonda has a method on tutorials on the way she does them.

  5. #5
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    I don't know if it was for the Joseph's pinwheel but the quarter square trianles she said to cut the square 1 and 1/4 larger than needed? (gets cut in 4, corner to corner) The half square it was 7/8 larger and it was cut in half, corner to corner? Does that sound right to all you math wizzards?

  6. #6
    Power Poster Jingle's Avatar
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    I read lot of ways to cut triangles, not really sure which way is best.
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  7. #7
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    Having been faced with making over 200 HST, I tried all methods. The one where I get best results, and is the fastes overall, is by printing off the triangle paper from on line and following the directions for sewing and cutting. The bias edge is controlled by the paper (I am leaving on until I sew together) and they turn out very accurate this way. I also starched the fabric before cutting.

    There is no way to create a triangle without one edge being on the bias.

  8. #8
    Senior Member Earleen's Avatar
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    I saw that also and don't remember what they did, but it was a way for not using the bias, also sleeping I guess.

  9. #9
    Super Member moonwork42029's Avatar
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    I use the printouts available from block central...love the way they turn out and I don't have to worry about the stretch.
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  10. #10
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    Triangle bias edges

    In general, when triangles are cut, at least one side will have a bias edge, sometimes two sides will have a bias edge. There may be instances when all three sides will have somewhat of a bias edge.
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    okay, there are two situations here... one is an HST which is sewn on the bias but then cut apart to make squares with a diagonal seam on the bias and straight of grain on the outside.

    the other is when you have a block on point and you need the filler triangles...NOW you want the long leg of the triangle to be on straight of grain....so.... measure the side of the block that the filler triangle will be sewn to.... now multiply by 1.414....that will give you the outside leg of the triangle needed to fill that spot.... so we will take a 10" block on point for an example.... 10" x 1.414 = 11.4"... so to simplify your cutting...you will cut one large square that is 11.5" (just a smidge extra and easier to measure on your ruler)....NOW cut that large square into 4 triangles by drawing an 'X' from corner to corner both ways. you now have 4 filler triangles and all 4 have the straight of grain on the long side (which is the outside for the filler area)... repeat with as many large squares as you need to go around the quilt....

    when you get to the corners....they are different...straight of grain needs to be on the 2 shorts sides...so go back to the size of the original square...10"...now you multiply by .717 .... 10" x .717 = 7.17".... cut 2 squares this size (I would round up to 7.25 but mark at the 7.17 to sew correctly) from your filler fabric, cut each square one time from corner to corner....now you have 4 halves but their straight of grain is on the two short sides which become the corners of your filler row... the square is smaller because the bias edge is being sewn to the square and it is longer than the 90 degree sides

    ...sounds confusing but trust me, follow step by step and it will be fine...here is a pic to show what i'm talking about. all the filler triangles are on the straight on the outside edge so that it is easy to sew on your borders and binding without stretching and ruffling...sorry, the corner triangle is just a tiny pc, but i already had the pic and it wasn't taken to illustrate this technique...

    it is not the only time you need these steps, but it is a common one... 1.414 and .717, these are the only two numbers you need to write down somewhere ... one of them will be right for whichever situation when you need a triangle on straight of grain...

    just posted and found 'bearisgray's' diagrams and they are nice and clear even tho she was demonstrating a bit differently but you can see the edges i was talking about in her diagrams... thanks bearisgray....
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    Last edited by deemail; 11-10-2011 at 12:33 AM.

  12. #12
    Super Member LyndaOH's Avatar
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    I have a good explanation on my blog at www.lyndaquilts.com. Hope it helps!

  13. #13
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    Squares in a Square

    Pretend the blue lines of the graph paper are the way the threads are woven (grain lines)

    If I was going to make a block like this, and wanted all the grain lines to be perpendicular to each other, these are the triangles I would use.

    I've found that the finished block presses out better when I cut the pieces like this.

    Of course, if the center square has a motif that I want to fussy cut for a certain effect, I would do that! Or any of the other components, for that matter.

    Yes, usually I would start with the center square cut on the bias.

    I would also probably use the strip cutting method instead of cutting the squares diagonally.
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  14. #14
    Super Member Rose Marie's Avatar
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    If you cut 2 large squares right sides togather, use 6 in sqs for 2 1/2 in triangles and 8 in for 3 1/2 in triangles.
    Draw lines from corner to corner both ways and sew 1/4 in down each side of lines- looks like an x.
    Then cut the block in half both ways then on the lines. You will have 8 triangles and they are not on the bias.
    Your triangles will need to be squared up slightly using Quilt in a Days square up ruler which only requires ONE cut.
    The way some do it by sewing around the outside of the block all your triangles will be on the bias.

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