Need some mathmatical quilting help
#1
Super Member
Thread Starter
Join Date: Dec 2012
Location: Connellsville Pa
Posts: 1,765
Need some mathmatical quilting help
I am doing a disappearing 4 patch. I want the final square to be 12 1/2 inches square. What size do the four patches have to be? I am cutting the four patches into 9 squares before I sew them back together.
[ATTACH=CONFIG]591719[/ATTACH]
Here is a picture of the final block I am trying to make. I started with 61/2 inch four patches, but the final block is 1 1/2 inches too small all the way around.
Any help is appreciated
[ATTACH=CONFIG]591719[/ATTACH]
Here is a picture of the final block I am trying to make. I started with 61/2 inch four patches, but the final block is 1 1/2 inches too small all the way around.
Any help is appreciated
#3
Senior Member
Join Date: Sep 2013
Location: Saskatchewan
Posts: 838
I think the block you show is a disappearing hourglass, which is made up of HST's instead of 4-patches. MSQC has a tutorial video on it here: https://www.youtube.com/watch?time_c...&v=xXggafOP230
Since you want a specific finished size, I would use a different method to make the HST's than what Jenny demonstrates. Her method gives bias edges all around the block; I would use the 8-at-a-time method instead, so that I don't have to deal with that bias. If you start with two 15" squares and use this method: http://blocloc.com/wp-content/upload...rt-for-HST.pdf, you will end up with eight 7" HST's.
Then follow the MSQC video from 4:05 onward. Join 4 HST's into an hourglass block, cut it into 9 squares, and rearrange as you did before. This should give you a 12.5" finished block.
It's late, so I might have made some huge mistake somewhere, but I think this will work. Good luck!
Since you want a specific finished size, I would use a different method to make the HST's than what Jenny demonstrates. Her method gives bias edges all around the block; I would use the 8-at-a-time method instead, so that I don't have to deal with that bias. If you start with two 15" squares and use this method: http://blocloc.com/wp-content/upload...rt-for-HST.pdf, you will end up with eight 7" HST's.
Then follow the MSQC video from 4:05 onward. Join 4 HST's into an hourglass block, cut it into 9 squares, and rearrange as you did before. This should give you a 12.5" finished block.
It's late, so I might have made some huge mistake somewhere, but I think this will work. Good luck!
#4
Power Poster
Join Date: Dec 2010
Location: Michigan
Posts: 11,276
That is a disappearing hour glass. I put a chart together to make them several sizes including 12.5" unfinished:
Disappearing Hourglass/Pinwheel Cutting Chart
Disappearing Hourglass/Pinwheel Cutting Chart
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