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# Thread: Half square triangle sizing help!!!

1. ## Half square triangle sizing help!!!

Well, math has never been a strong point and today I am baffled. I am making a simple block 12 1/2" and am going to do half square triangles, but cannot figure out the size of the squares, everything I am reading or watching on u tube has muddles my after christmas burnt out brain. Can anyone tell me how big the squares have to be? Please. I am attaching a pic from EQ7 of the finished 12 1/2 block. Thanks so much.

2. The squares should be 7/8" larger than your finished square. 12 1/2 + 7/8 =13 3/8.

for quarter sq. triangles the amount to add would be 1 3/8. 12 1/2 + 1 3/8 =13 7/8.

3. Bakermom has it. Those are quarter square triangles in your pattern. Though did you mean a 12 1/2 finished or unfinished square?

though I always make mine a tad bit larger so I can trim them just right.

ali

4. First of all, if that's a full block ... those are QST not HSTs

Each 1/4 section of the 12-1/2" block (unfinished size) would be 6-1/2"x6-1/2". So each QST would be this measurement before sewing into the quilt block.

If the 12-1/2" you have given is for the finished block (after it's sewn into the quilt) you would need each QST to be 6.75"square.

Same measurements if you are using HSTs instead of the QSTs

5. The block will be 12" finished. They are qst, but the design is hst. Eggnog brain today. I just cut 6.5 squares, and marked them and now will sew them. I thought my 6 1/2" was correct, but for some reason the 7/8" rule didn't work in my brain.
Originally Posted by QuiltE
First of all, if that's a full block ... those are QST not HSTs

Each 1/4 section of the 12-1/2" block (unfinished size) would be 6-1/2"x6-1/2". So each QST would be this measurement before sewing into the quilt block.

If the 12-1/2" you have given is for the finished block (after it's sewn into the quilt) you would need each QST to be 6.75"square.

Same measurements if you are using HSTs instead of the QSTs

6. If you are sewing 6-1/2" squares together to make HSTs, you will NOT have 6-1/2" finished. You need to add the 7/8" to the finished size .... so you want 6" finished, then it'd be 6-7/8 cut sizes for the HSTs .... I always add the full inch to give some wiggle room, and lets me square up nicely.

Likewise the added amounts if you're doing the QSTs

7. Okay, I'm really confused now. You say they're QST but the design is HST? I can see that the center, if you made that first, could be made as 4 HST's put together, but then you would have to add the corner pieces. It would be much easier (IMHO) to make each corner unit as QST's and then put the 4 of them together.

EQ should give you all the cutting information, but I'm not sure how it looks at this particular block.

8. Hello. Here's my answer. The design you gave us is what I have always called an "hourglass". In order to keep the bias from stretching so much, it is suggested that you cut your squares 4 ways--quarter square triangles (QST). To make QSTs, your squares must be 1 1/4" larger than your finished squares. So, if your 12 1/2" block is one hourglass, then you must cut your squares 13 1/4" and cut them 4 ways. If, as your pictures suggests, you are using 4 hourglass blocks to make each 12 1/2" block, then you cut your squares 7 1/4", cut them 4 ways, and after sewing a bunch of hourglass blocks (which would make 6 1/2" blocks unfinished), sew 4 together to make your intended block. When I want really scrappy ones, I use graph paper to make my large block (like 13 1/4"), mark it for the QST, cut them apart, then I simply place one on my scraps and cut. I do try to be careful to put the long edge on the grain so that it is not so stretchy. The blocks fit together so much better using QSTs. Ask me how I know??? LOL!

Joyce

9. Wow, I understand this, thanks Joyce. This makes sense to me!!!

Originally Posted by Retired GI Jo
Hello. Here's my answer. The design you gave us is what I have always called an "hourglass". In order to keep the bias from stretching so much, it is suggested that you cut your squares 4 ways--quarter square triangles (QST). To make QSTs, your squares must be 1 1/4" larger than your finished squares. So, if your 12 1/2" block is one hourglass, then you must cut your squares 13 1/4" and cut them 4 ways. If, as your pictures suggests, you are using 4 hourglass blocks to make each 12 1/2" block, then you cut your squares 7 1/4", cut them 4 ways, and after sewing a bunch of hourglass blocks (which would make 6 1/2" blocks unfinished), sew 4 together to make your intended block. When I want really scrappy ones, I use graph paper to make my large block (like 13 1/4"), mark it for the QST, cut them apart, then I simply place one on my scraps and cut. I do try to be careful to put the long edge on the grain so that it is not so stretchy. The blocks fit together so much better using QSTs. Ask me how I know??? LOL!

Joyce

10. You can print out the block pieces in EQ and then measure as a guide to cutting size.

11. Chemo brain has shown up. I am still confused about sizing HST. Could someone explain it again, but in a different way. Maybe then I'll get it. Sorry to sound dumb but sometimes info doesn't register. Thanks.

12. Originally Posted by Taino Jan
Chemo brain has shown up. I am still confused about sizing HST. Could someone explain it again, but in a different way. Maybe then I'll get it. Sorry to sound dumb but sometimes info doesn't register. Thanks.
I use the graph method to make my HSTs...if i want a finished block to be 3" (WITH the two triangles)...it needs .5" for seams, so then i draw a 4.0" graph, connect all corners diagonally and then sew on both sides of the diagonal lines (these are guidelines for sewing, you do not sew ON them..you cut ON them later)...after sewing all the diagonals, cut on both vertical and horizontal graph lines and on the diagonals ... each triangle will be opened up into an already finished HST... after pressing, i trim them to the perfect 3" size.... if you need a QST, then you add .5 for both seams...so this would be a 4.5 graph, they would be 4 after the first seams and cutting, and now are large enough to match 2 tog to make the Hourglass... when all 4 pcs are together, match your square up ruler to the center point and trim to the 3.5 needed to have the right size and one final seam allowance... I add .5" when they call for 3.8" and 1" when they call for 7/8"...it is simply easier to see on the ruler, wastes so little as to be negligible and will have just a tiny bit to trim to the perfect, flat size.

13. I don't buy many extra rulers but do have one called WonderCut Ruler for making HST and I wouldn't trade for anything.

14. you are all so SMART I am just amazed!

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