Need help with block size
 

I made 9-patch blocks with Jellyroll strips, and the blocks now measure @ 6.5inches.

I plan the alternate block to be an hourglass.

I want to make the hourglass block with 2 squares sewn all around and cut diagonally twice.

Can someone please tell me what size the 2 squares must be?

TIA🌷

I am not sure about the "sewn all around" part of your question. I usually start with a block and a diagonal line and sew two HST (half square triangle units) which I then cut again and reassemble. Am going to assume your 6.5" includes your seam allowance for a 6" square.

Here's Jenny Doan/Missouri Star quilt company video
https://www.youtube.com/watch?v=uIyH...l=MissouriStar

And here's a text non-Jenny version
https://www.diaryofaquilter.com/hour...lock-tutorial/

For me, I typically cut large and trim down and would use finished size + 1.5 inches or 7.5" starter blocks for your (finished) 6" 9-patches. Here's yet another website with a chart! This quilter is a bit more precise than I am and uses 1.25 instead of my 1.5.
https://www.scrapish.com/hourglass-quilt-block.html

Hope this helps and is not just more confusing than you started!

I understand what she means. You take square one and lay it right sides together on square two. Sew a quarter inch seam around all four sides. Then cut the block diagonally twice, like a big X. But that only gives you half square triangles, not an hourglass. I think you have to sew them again and cut again. I'm trying to find a tutorial online somewhere....

I didn't look at the M* video that Iceblossom posted, it may be the same technique. But here's another Jenny video where she starts with a 4-patch made from charms, sews it RST with another 4-patch (all 4 sides), then cuts it twice on the diagonal and gets 4 hourglass blocks. When she placed one on her mat, it measures exactly 6 inches.

So I'm thinking maybe experiment with scraps or paper towels or something. Try cutting them at 5.5" or 6" and see what they finish at.

The method for yardage;
1. Divide the finished size of block (6”) in half (3)”. Add .5” (3.5”)
2. Cut strips WOF (3.5”)
3. Cross cut triangles with hypotanoose on strait of grain. Both Omnigrid and Creative Grids (90 degree quarter square triangle) have special rulers for this.
4. Sew 2 triangles together with 90 degree corners together . Press open
5. Line up 2 triangles with right side together and matching seam on longest side. Stitch on longest side. Press open
No trimming needed.

If interested, I’ll dig deeper.

Pythagorean theorem time!
https://www.quiltingboard.com/member...522-624329.png
TLDR- start with a 5" square for your four patch, and you should end up with a slightly bigger than 6.5" hourglass.

Wow! We have some brainy people on QB!

Thanks for the link to M* tutorial ....

In the sidebar on YouTube I noticed another video where Jenny used Layer cakes to sew a 9-patch with hourglass blocks.

Make a "9 Patch and Hourglass" Quilt with Jenny! - YouTube

After cutting 2.5 strips of the layer cake, she used the 7.5 piece that is leftover for the hourglass block.

Which is the size Iceblossom suggested.

I will use this video's method rather than the sew around.👌

Thank you all for your input.
You are superstars!!🌟🌟🌟🌟🌟🌟🌟

Much appreciated🌷💕

Yay!!! I'm glad you found a solution that works!