Originally Posted by
dray965
Is there a tip/trick/whatever to make it easier to match where the triangle seam crosses the seam of the square without my having to take it apart 3-4 times each block.
I would take the block to the ironing board first. Take a straight pin and push it straight down through the triangle piece at the seam and match this up to the block's seam. In other words, the straight pin should be at the exact matching place for both pieces, 1/4" in from the edges. Once you are satisfied with this, I recommend using Elmer's washable white school glue. Lift up the top of the seam allowance and place a small (tiny) drop of glue inside the seam allowance right next to that pin. Use your iron to press the seam, which will cause the glue to keep the seam allowance in place. Only then do you remove the pin and go to the sewing machine.
In your photo, you would need to do this for both places on the block where the triangles meet the block seams. There may be a gap between the two spots, caused by one middle piece being longer than the other. Place the longer side against the bed of your machine, which will help you ease in the extra fabric. (You can pull a little on the top fabric while sewing also.)
An alternative to this process is to use a long stitch on your machine to sew just the triangle/block seams for about 3 stitches each. Take out of machine and check to see if seams are matched. If not, it's easy to remove just those 3 stitches where the point meets and re-sew with basting stitches until correct. Once you are satisfied, do not remove the basting stitches; just sew over them when you sew the seam.