Bonnie's at it again! She's established a new Leader-Ender (L/E) project for 2015 -- Tumblers. She's proposed L/E projects in the past, but I've never participated. Other L/Es have always been underway!
Mind you, I have a few L/Es underway right now.... Omigosh and RWB 9-patches, but....
I was feeling inspired after catching up on some FB posts this AM.
I don't have a tumbler ruler nor a dresden ruler, but... I have a geometry background and a master's degree in Mathematics. That should be enough :D
Geometry 101: if two parallel lines are intersected by a transversal, alternate interior angles will be supplementary.
Layman's terms: as long as both transversal cuts are identically symmetrical on opposite sides of a square, units pieced together in an alternating way will result in a straight line (seam.)
So, I grabbed a piece of cardboard (one of those inserts from Hancock's packaged FQs), and cut a 2.5" square. On the 'top' end of the square, I tapered a cut in 1/2" -- and repeated this on the other upper corner.
Result: Top dimension (unfinished): 1.5". Bottom dimension (unfinished): 2.5".
Despite my template being made of cardboard, it isn't rigid enough for a rotary cutter. Psht! No biggy! After pressing four strips together, I simply placed the template atop the strips and then placed one of my smaller rulers along the edge of the template.
It really wasn't all that putzy, nor did it add much additional time. A few seconds.... minor!
Then, just as if you'd have cut them from a "real" ruler... the corners need to be overlapped ever-so-slightly for accurate piecing...
And, oh my goodness-----these tumblers (at this size!)-----they're kinda stinkin' cute.
Oh, that Bonnie!!!!!