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Originally Posted by chickadeee55
(Post 5866078)
Hi,
Can anyone tell me what size blocks I would need to make a finished 8 1/2" nine patch block. If possible I will try to use strips, but I can't figure out what the width of the strips need to be to get a finished 8 1/2" block after sewn together. The closest I came up with was 3 inch strips, three sewn together would give me a finished 8" block, I am not sure that is correct. 3.333333333333333333333333333333333333333" which includes you seams. Why not go to 9" |
Originally Posted by mucky
(Post 5866166)
Just do 3.33333333 and sew a scant bigger seam
8.5 divided by 3 equals 2.83333333333333333333333 plus a half inch for two seam allowances makes 3.3333333333333. Which requires a 1/4" seam allowance all around. Any more or less and you won't get near 8.5" |
Originally Posted by lfstamper
(Post 5866128)
3 5/16 is what EQ7 says. Make a test one first to be sure.
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If you are making a picnic blanket I am wondering why you need the 8.5" block. It appears to me that you would be easier to alter the large block cut from the fat quarter rather than all those very odd size smaller squares for your 9 patch. For me it would be too much aggrivation to deal with an odd size smaller square and more precision to get it exact. More flexibility in the larger squares and considering all fat quarter are not the same size.
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Originally Posted by Holice
(Post 5891285)
If you are making a picnic blanket I am wondering why you need the 8.5" block. It appears to me that you would be easier to alter the large block cut from the fat quarter rather than all those very odd size smaller squares for your 9 patch. For me it would be too much aggrivation to deal with an odd size smaller square and more precision to get it exact. More flexibility in the larger squares and considering all fat quarter are not the same size.
Or cut 3" strips to end up with 7.5 finished and then cut the FQ's to 8". |
I would cut a piece of paper to 8.5" square, and fold it into thirds. Then mark that fold, and put it under my ruler, to get an idea where it would fall . . ..
The math way is the way to go, for sure. but I would need a way to visualize that perfect cut. good luck!! |
Formula: finished block size divided by 3 and add 1/2" for seam allowances = 8 1/2" nine patch blocks
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