Measurement of stamped parts (from coiled metal)
Measurement of stamped parts (from coiled metal)
(OP)
I work for an electronics company, we use a lot of stamped copper parts. We have a power module that will get molded as a single stamped array of lead frames. This will be cropped to make the individual circuits later.
Some of the GD&T is being debated with us from the supplier. The issue is datum A. Datum as is the plane in which the metal lies, but in the real world it has memory of being coiled up. So this datum should be stated, while being constrained I suppose, but I have never seen this in practice/drawing.
Can you guys supply examples of how datums are stated, and understood to be constrained? held down?
Some of the GD&T is being debated with us from the supplier. The issue is datum A. Datum as is the plane in which the metal lies, but in the real world it has memory of being coiled up. So this datum should be stated, while being constrained I suppose, but I have never seen this in practice/drawing.
Can you guys supply examples of how datums are stated, and understood to be constrained? held down?





RE: Measurement of stamped parts (from coiled metal)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Measurement of stamped parts (from coiled metal)
RE: Measurement of stamped parts (from coiled metal)
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Measurement of stamped parts (from coiled metal)
Many of my drawings of sheet metal and of plates state "DATUM A APPLIES WHEN THE FACE IS CLAMPED TO A FLAT REFERENCE SURFACE.". The ASME Y14.5 chapter on free state gives you a lot of possibilities.
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JHG
RE: Measurement of stamped parts (from coiled metal)
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RE: Measurement of stamped parts (from coiled metal)