Math for half square triangles
#1
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.
#2
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Join Date: Aug 2009
Location: The middle of an IL cornfield
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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.
Many sites say to add 7/8 inch but I hate working with odd measurements so I just add 1 inch.
#3
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,
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,
#6
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.
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