Thank you for all the wonderful posts you put up on the board, they have been so helpful to me.

If one cuts the beginning squares on bias the ending squares will have straight grain edges. I do like to have the final half square triangles a bit larger so they can be trimmed to exact size.

A walking foot helps in sewing bias edges.

thanks!

Thanks

I tried this and got 3 1/4 triangles not 3 1/2 which is what I needed. Thought I had done something wrong so I used a different fabric and got the same results.

Thank you this sure makes things easier.

Hi,

I'm trying to make 3 1/2 inch half triangles. If using the technique shown in the video, how large should be actual square be before cutting? Thanks.

These measurements were listed previously but I find they seem to be small. My samples have needed the beginning block 1/4 to 1/2 larger. Best to make a sample and if half square triangle block is too big trim it down.

Starting Block
2" 1"
2 1/2" 1 1/2"
3 1/2" 2"
4" 2 1/2"
5" 3 1/2"
6" 4" I use 6 1/4 for 4" block
7" 4 1/2"
8" 5"
8 1/2" 5 1/2"
9" 6"
10" 7"

Agree with the need to make the start blocks a bit bigger and then trim down. The accurate maths would be great. The Easy Angle ruler makes very accurate half-square triangles, although not as fast as the method here.