|Ask the Experts|
August 23, 2019
Is Component Lead Damage Reparable?
Our lead forming process left gashes in the component leads. Some more than 10% of the lead thickness, some not quite.
Basis material was exposed on all leads that were sliced.
Do IPC standards allow the touch up of the exposed copper on component leads?
|Expert Panel Responses|
Maybe not the answer to the specific question (I don't know if the IPC standards allow for touch ups) but you may be able to prevent the damage so touch up is not needed.
In some lead forming dies, the corners can be sharp and the surfaces rough. These sharp corners and rough surfaces can cause the lead deformation.
Removing the die pieces and rounding the edges can reduce the nicks on the inside of the bends and the scrapes on the outside of the lead.
Additionally, highly polishing the areas of the die that contact the lead (or plating them) creates a smooth surface that will also reduce deformation.
In the old days, the acceptable "spec" was to not have exposed copper. Rounding the die and polishing will get you there most of the time.
Heller Industries Inc.
First I recommend you address the poor lead forming process that left gashes in the component leads. Goal should be zero percent damage to leads. As far as IPC standards allow the touch up of the exposed copper on component leads, I referred to my resident expert Janice Pobanz (IPC CIT & NASA Training Specialist ) and her input about J-STD-001:
VP of Advanced Technical Operations
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