FAT Checks for a Custom Progressive Metal Stamping Die
Buyers of a custom progressive stamping die should agree pass or fail checks before the factory acceptance test, covering part dimensions, strip progression, and forming results against the part design.
Before signing off a custom progressive stamping die, decide which checks at the factory acceptance test will count as pass or fail, and write them into the purchase order. Because the die is built to a custom part design, the part drawing should be the reference for every check rather than a generic catalog value.
Ask the supplier to propose a first-article sample and a measurement plan tied to the custom part design. Which dimensions are critical, and which are reference only? Will the acceptance test run the die in a progressive sequence, and how many parts must be produced before sampling? Confirm the sheet metal grade and thickness to be used, since forming results depend on them.
For the demonstration, agree how strip progression is observed and what counts as a fault, such as misfeed or incomplete forming. Define pass or fail for each measured feature against the drawing tolerance, and state who records results. Any catalog specifications the supplier cites are reference values only and should not be assumed to apply to the supplied die.
Before requesting a quote, confirm with the supplier which checks they can perform in-house, what sample quantity and material they will use, how measurement results will be documented, and whether the acceptance criteria will be attached to the quotation.