Hydraulic Die Forming Discussion Group

Stacking urethane

Michael Andrews
michael@thelindsaycollection.com

After researching the threads, I am unable to find an answer to my question.
I saw on the threads the following information:
4 Basic Rules For Using Urethane for Forming in a Hydraulic Press:
• The harder the urethane, the better the details
• The thinner and softer the metal, the better the details
• The thinner the urethane the better the details
• HOWEVER, never press more deeply than 2/3 of the depth of the urethane. The urethane should be twice as thick as the tool.

I am using 1/4” to 1/2” matrix dies in a 4” round container (like the example in Susan Kingsley’s book, pg. 33 ex.8).  If I understand the above information correctly, a 1/4” die would need a 1/2" thick pad. If this is true, would I need to use a single 1/2” pad or could I use four 1/8” pads, or two 1/16” pads plus one 1/8” pad plus one 1/4” pad. Does stacking various pad thicknesses change results in a formed object?
Thanks in advance,
Michael Andrews

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