Please Help Me
#1
Member
Thread Starter
Join Date: Feb 2012
Posts: 7
Please Help Me
I need to make squares that are half square triangles that end up 3-1/2" unfinished.
When I add 7/8" to the squares before I sew them, they end up too big. I've tried cutting various sizes to get the 3-1/2" squares but just can't seem to come up with the right measurement.
What am I doing wrong? What size should I be cutting my squares?
Thanks in advance for all your help!
Sue
When I add 7/8" to the squares before I sew them, they end up too big. I've tried cutting various sizes to get the 3-1/2" squares but just can't seem to come up with the right measurement.
What am I doing wrong? What size should I be cutting my squares?
Thanks in advance for all your help!
Sue
#3
do you cut them 3 7/8 or are you adding the 7/8 to the 3 1/2? I usually add one inch to the 3 inch size and then trim for exact. some people have great luck doing the 7/8 inch bit though. but always add that to the "finished" size, not the unfinished size. and if you do trim always place the 45 degree line on the seam corner to corner, line up to size you want, like 3 1/2 and trim two sides. then turn the block, place ruler and trim the other two sides. try again, you seem to be doing fine.
#4
Super Member
Join Date: Aug 2010
Location: Piedmont Virginia in the Foothills of the Blue Ridge Mtns.
Posts: 8,562
Here is my tutorial on many different triangles, including the Half Square Triangles you need. It's in pdf. format so you will need adobe reader to open it. That is available free on the internet for download.
As a quick reference, make your base squares ONE INCH larger than the desired half square triangles, then trim them down for better accuracy after sewing them.
Jan in VA
As a quick reference, make your base squares ONE INCH larger than the desired half square triangles, then trim them down for better accuracy after sewing them.
Jan in VA
#5
Super Member
Join Date: Aug 2009
Location: The middle of an IL cornfield
Posts: 7,014
I agree with the others. 7/8 is a pain. Add 1 inch to the finished size you want the squares to be. If you want 3 inch finished HST, start with two 4 inch squares. You will have a bit to square up, but that seems to work better for me.
#9
Super Member
Join Date: Mar 2011
Location: Central NJ
Posts: 5,571
Another one in the camp of cut big and trim down...particularly with HST's. Those bloody things never come out straight/true no matter how careful I am. But you do add the increase (regardless if you chose 7/8 or 1") to the FINISHED size (in your case - 3" + 7/8") and you will end up with 3.5" hst's.
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