Originally Posted by PaperPrincess
Tutorial here:
http://www.quiltingboard.com/t-89997-1.htm
you really do need to figure out where on your machine this is. If your quilt is made up of all the exact same blocks, then just being consistent will be just fine. As soon as you try to piece one block with 3 seams next to a block with 2 (or 4 or 5) seams, you will start to have problems.
The quilt that was off by less than 1/16 inch would have been accurate regardless of how many different styles of blocks were in it. I did the math first to determine the correct size (13 8 inch blocks plus one 3 inch piece to balance the frame plus 2 unfinished edges equals 107.5 inches) and the measurement was within 1/16 inch. I like to enjoy quilting and am glad I don't have to stress over 2 threads.