[QUOTE=Prism99;7697957]
Have you actually done the strip test? That is the easiest way to figure out how to adjust your cutting and seam allowance. I think a link was posted earlier in this thread. It means cutting 3 strips 2-1/2" wide, sewing them together, pressing, then measuring. Until that measurement comes out to 6-1/2" exactly, you do not want to be attempting complicated blocks with lots of seam allowances.
I too would recommend doing this test.
A lot of instructors say not to use the lines on your cutting board, but I use them all the time.
I place the edge of my fabric on one of the board lines so that the line barely shows.
Now place the ruler so that the 2.5" line is on top of the board line your fabric is against.
All the other lines on your ruler should match up with the board lines - this helps me make a straight cut.
Cut several groups of 2.5" strips, so that you can try different ways.
Sew 3 strips together with what you think is you 1/4" seam. Press it open, it should measure 6.5".
If it is too small adjust your needle to the right to make the seam smaller.
If it is too big, adjust your needle to the left to make the seam larger.
Even the 1/4" foot needs the needle adjusted to different points on different machines.
Good luck!! Ann