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I probably shouldn't be attempting this as yet as I'm quite a Newbie but am trying a layout of my own design. Have everything else calculated - block/sashing/sashing corners/inner and outer borders but am stuck on this.
I am trying to "frame" 9 inch square blocks (9 1/2) but I want to frame them with 1/2 rectangles sewn together (so I can get two colors on each side) to make a 3" wide piece. Using a 3" x 9 1/2" piece cut into the triangle/s and resewn is too short. I know that when you're making half-square triangles you need to add 7/8". Is it the same with rectangles? And do I need to start with a 3 1/2 " wide strip? Tried muslin in different increments......tried the internet. Not finding my answer and really didn't want to use the machine today in all of our storms. If anyone knows I'd appreciate the assist! I hope I'm making myself clear enough or as my Mother would have said - I'm "clear as mud"!?

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Comment by Chris Bell/IA on June 19, 2009 at 8:05am
If you follow Lynn, you will be fine on your measurements...
Comment by Annie Zipser on June 12, 2009 at 5:02am
I use graph paper to graph out my blocks and then I add 1/2" to squares and rectangles. I have found that if I am making 1/2 square triangles, I add 3/8" to the size of the finished square to get the size I need. I guess I would add 3/4" to square size if I want 1/4 square triangles.
Comment by Kathy Hylton on May 20, 2009 at 7:31am
LOL I read this and scratched my head. I am a newbie and while I have tried to alter a design - you are way ahead of me! I am working on an intricate pattern right now that calls for those 7/8" and 3/8" cuts. I went to the next 1/2" and then square up to get the right sized block - and I'm glad I did it that way. I'm accurate, but still have my "boo boos" in these tiny 1/8 size measurements - and when you think about it 1/8 " isn't much! Lol Life is too short - go with the 1/2" and 1" and then square back... I admire your bravery - that kind of "designing" makes my head hurt...lol
Comment by Janet S. - MO on May 17, 2009 at 10:49am
That's my goal today - to do trialand error, will start with Lynne's suggestion and see where I go! Thank you all!
Comment by Sognstitcher Lana/MN on May 17, 2009 at 10:07am
Janet, I think you are on the right track. I would just add the extra 7/8" or 1", which ever suits you. Trial and error. Try it with scraps and see how it turns out. Then take the winning measurements and multiply by how many you need. (I cheat)
Comment by Kathy Marlowe on May 16, 2009 at 8:12am
When I am making 1/2 square triangles I never do the 7/8 inch, I just go to the next full inch. This gives me a block that I can trim down to the desired finished size even if my seam was not accurate, or my pressing was bad. I would do the same with doing 1/2 rectangle triangles. Does that make sense?! 1/2 rectangle triangles?! It's clear as mud in MY mind! lol And my mom passed on the clear as mud line to her kids, and now the grandkids are picking it up!
Comment by Lynne on May 16, 2009 at 4:43am
Janet,,, if you want the finished size to be 3 x 9, then the uncut size has to be 3 1/2 x 9 1/2. Are these 1/2 rectangles??? Are you trying to take 2 rectangles and get 2 colors on them with a seam from upper left corner to bottom right corner??? If you are trying to do that,,, on the chart I have, to get half rectanges from a true rectangle,,, it says you have to add 11/16" to the height and 1 1/8" to the length of the desired FINISHED size. Your finished size being 3 x 9. Try it in muslin first,, like you have been doing.

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