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  • Math for half square triangles

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    Old 12-28-2009, 07:35 AM
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    I want to make an applique wallhanging featured in the current issue of Quilter's Newsletter. It uses 184 half square triangles cut by hand but I want to use the Fons and Porter ruler so I don't have to sew all those bias edges. My question is: the block size is supposed to be 2 3/8": what size do I cut my blocks to use the Fons and Porter ruler? Is it an extra 7/8"? That would make my cuts at 3 1/4"? Thanks in advance for the help.
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    Old 12-28-2009, 07:39 AM
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    I do HST by adding 1 inch to the finished block size. Draw a diagonal line and then sew 1/4 inch from each side of the line. Cut along the line and then square up as needed.

    Many sites say to add 7/8 inch but I hate working with odd measurements so I just add 1 inch.
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    Old 12-28-2009, 02:02 PM
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    To do HST you do add the 7/8 for an accurate measure, and so it is 3 1/4 in.

    I don't have a fons and porter ruler so can't help you with that part.

    but these measurements will give you a 2 3/8th's block. I wold test it out on one or two blocks to make sure that they come out the size that you would like,
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    Old 12-28-2009, 02:55 PM
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    Thanks for the help, I knew I would find the right help here. Wish me luck with the challenging quilt.
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    Old 12-28-2009, 02:55 PM
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    Good Luck!!!!!!!!!
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    Old 12-29-2009, 11:53 AM
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    Originally Posted by quilter1
    I want to make an applique wallhanging featured in the current issue of Quilter's Newsletter. It uses 184 half square triangles cut by hand but I want to use the Fons and Porter ruler so I don't have to sew all those bias edges. My question is: the block size is supposed to be 2 3/8": what size do I cut my blocks to use the Fons and Porter ruler? Is it an extra 7/8"? That would make my cuts at 3 1/4"? Thanks in advance for the help.
    That is an odd size for a block... I haven't seen that size for a block before. That would make the cutting a nightmare for me :oops:
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