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Notes on pwa drawings

Notes on pwa drawings

Notes on pwa drawings

What are some of the types of notes that need to go on an printed wiring assembly drawing that will be given to a assemlby house?

RE: Notes on pwa drawings

Any dimensions that must be maintained after assembly (component to be flush to panel, max. or min. clearance between components or component & panel, etc.).

If coatings are to be applied, indicate area to be coated & state min. or max. thickness (if applicable). It also may be favorable to indicate where coatings are NOT allowed (open frame relays, edge contacts, unsealed switches, slots/holes)

Any secondary operations should be clearly explained (applying tape or adhesive, lead or component forming, relay venting)

Max. lead trim height or component height if it is a concern.

Special handling requirements (anti-static, shock, vibration).

Special testing requirements (usually a separate document referred to by a note on the assy. drawing).

Cleaning requirements (if needed).

In short, any note that will clarify your requirements to the people assembling your product.

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