Originally Posted by Macybaby (Post 8029409)

This is why I love my EZ angle ruler. If you need the setting trangle to line up with a block that is 6.5" unfinished, you cut a strip at 6.5" wide. Then you use the angle to subcut it. Since it has the "dog ear" at the top already gone, you're cutting a larger HST than you'd get if you went point to point.

Yes, doing this way you will end up with the bias on the outer edge, but to date, that has never caused me a bit of problems.

Originally Posted by cjsews (Post 8029368)

Look on quiltville.com. Bonnie Hunter has a chart with dimensions to cut setting triangles

Originally Posted by PaperPrincess (Post 8029369)

Bonnie Hunter has great info on setting triangles. She provides the math and a chart:
https://quiltville.com/onpointmath.shtml

Originally Posted by Krisb (Post 8029283)

So...what is going wrong? The blocks in the runner may not be coming out at 6.5” unfinished. Did you square them up before you put them together?

Those pesky double diagonal cuts can be harder than they seem. If you measure one of the short sides, it should be a tiny bit over 6 7/8”. The dog ears extend past the edge of the block to which you are attaching the triangle, and your seam, if perfect which mine never are, intersects right at the raw edge.

Mine never do. I just start with slightly bigger triangles, like 10”, slice them twice diagonally, attach them, and trim the edge to make sure there is a 1/4” seam allowance past the points.

The four corner triangles are cut from 5 1/8” triangles sliced once diagonally; I would probably use 5 1/4”. Again, you can always trim later.