Half square triangles
 

Does anyone else have this problem? I draw the diagonal line from corner to corner on the smaller piece, put it on the larger piece, pin it into place, sew carefully, and then open and press, and inevitably there's almost 1/4" of fabric from the larger piece sticking out that needs to be trimmed, leaving the block smaller than necessary for the pattern.

How do you avoid this problem?

i always make mine a little bigger and then when done sewing cut to size i want.

Always make it bigger for me. It has NEVER worked out exactly right for me doing it any other way, except if I use Thangle paper.

I don't even get good results from Thangles! I oversize both pieces and make them the same size. Draw my line, sew, cut and press. I then trim them to the correct size. Tedious, and when there are lots, tiresome but it's the only way that works for me.

I'm not sure why you have a larger piece and a smaller piece. With the method you describe, I use two squares of the same size.

The secret of sew and flip corners is to stitch just to the right of your drawn line. Also, when I do that, I iron flap over, trim only the piece of fabric in the middle, leaving flap and back in place, because that back fabric is the true edges and that is what I use to sew seams together. There is a bit of bulk there, but not enough to cause any problems

Maybe going flying geese or snowball type.

I use two squares that are the same size too. The last pattern I used said to cut the squares 2.78" but I cut them 3" and trimmed the HST to size. Not sure why the pattern called for 2.78" when 3" is so much easier to measure.

I always use two squares the same size. Perhaps the different sizes is what is causing the problem

I agree with Blackberry and Geri B - my squares are the same size.