Wire Draw Dies

We recently purchased a used Vaughn 5/6 Multi Head Wire Draw Machine.
The First drawing station is a double draw on a single shaft. The drive motor for this station is controled by a potentiometer and is based on the speed of the next draw head.
I understand the Die selection for this double draw station is very critical to prevent breaking the wire.
Question; What are the parameters to consider in calculating the die sizes for this double draw station.

The parameters are de diameters of the same block (Top and Bottom ) and the die reduction of area

%die reduction =
100-100(Bottom Block Diameter/Top Block Diam)

Eduardo Anaya
Senior Consultant
INDEPA S.C.
Mexico City
Tel(011-52)555-407-7451
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