March 12, 2012

Design Wall: Reverse Engineering using EQ7

On-Point Quilt Math will be the death of me.....  I just don't understand it.  All I know is that 1.414 is the key.  I realize that there are sites with pages devoted to explaining methods of calculation for corner setting triangles and side setting triangles for quilts.  Some provide cheat sheets so that one doesn't have to even do the math.  I may not understand it, but I can surrender myself to just knowing that it works.

What happens, though, when one has to reverse engineer a quilt design?  Things get pretty interesting....  Stomachs  like mine get upset.  The anxiety monster that I have caged rattles the bars and starts picking the lock.  Add to all this the fact that I'm trying to make changes to the original design, and you have one crazy quilter.  I'm ready to pull in reinforcements:  my husband or my two older children who have more recent experience with Geometry.

I'm hoping that EQ7 will relieve some of my angst.  I know certain things about the Stephenie Meyer Reproduction Twilight Quilt despite not having an actual pattern to reference.  I'm trying to use these measurements to reverse engineer the quilt.  I'll also be using the EQ7 Lesson 5:  On Point Medallion Quilts to complete the design.

For starters, I found the block, Twelve Triangles, that looks like the center section of the SM Twilight Quilt:

The squares in the checkerboard are 1" finished and there are 12 whole squares plus the half square traingle that butts up to the previous on point ribbon unit so I knew this triangle unit would measure 13" + 7/8" for the seam allowance as it's a triangle unit.  The measurements for the rest of the parts of the center unit are dependent upon the measurements of these triangle setting units and these are what I really wanted to know without giving myself too much of a headache.  I could have gotten out my calculator and figured out the rest of the unit measurements, but I decided to use EQ instead.

I guesstimated that the center unit measured at least 24" finished.  I edited the block size on the worktable to 24".  I used the Print Rotary Cutting Chart function to preview measurements of the center.  24" was too small.  I settled on 26".

I'll want to test it..., but I'm pretty sure it's right.  I think it makes sense because I was told to make the Twilight Hands block 7" finished and with 1" (or so) sashing the block would be 9" plus inches  The chart shows this block to be 9 11/16 unfinished (9 3/16 finished).

The ultimate question will be, though, if I want to leave these checkerboard squares at 1" or make them larger?


  1. I am really good at using EQ6 this way....... lol.... looks like you did it right :)

  2. I'm beginning to think I can't live without the program. It is so awesome!!


Comments are our brand of heroin.