Thomas Vacca

Director of Tooling and Design Engineering
Micro Stamping Corp.
Has a shop floor stamping or tool and die question stumped you? If so, send your questions to kateb@thefabricator.com to be answered by Thomas Vacca, director of tooling and design engineering at Micro Stamping Corp.

Ask the Expert: Stamping thin, hard stainless steel

March 6, 2015

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Q: We recently received an order for domed spring washers stamped from 0.0010-inch-thick 301 1/2 hard stainless steel. The parts are about 0.250 in. OD and have two 0.006-in.-diameter pierced holes on a 0.150-in.-dia. circle centered on the part. We usually do not stamp anything less than 0.010 in....

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What springs are best for forming HSLA down and drawing up?

March 10, 2011

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Choosing the right spring for working with HSLA is very important. The author recommends chrome nitrogen springs of well-known brands for proper quality control.

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How can I stop die wrecks that occur even with sensors in use?

August 4, 2010

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Even with many styles of sensors on a progressive die, die wrecks continue to occur. Addressing potential miss hits during the design stage, and using proximity sensors in careful, deliberate ways, can help control the problem.

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Overcoming deformity by design

October 10, 2006

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Achieving typical goals in stamping, such as zero development and fewer labor requirements, is made easier when the progressive die strip is kept level through the entire progression. Keeping the strip level can eliminate wave problems caused by incorrect pilot/lifter use occurring in punch forming.

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