I am in the process of making dresdens with ties (first time). I posted a WIP photo here:
http://www.quiltingboard.com/t-111622-1.htm
You'll need a dresden ruler to cut the blades. My wedges were 6 1/2" and the plate turned out about 13" in diameter. Based on this size, you could get probably 20 wedges from each tie because you pick the tie apart first. (Need 20 wedges for each plate). PM me with questions if you want.