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Hello,
For sheet metal parts, it is good to indicate countersinks/milling in 3 dimensions on the plans and to indicate the largest diameter as well as the angle. For an angle corresponding to a 45° chamfer (the most classic), one traditionally indicates a milling at 90°, which corresponds to the angle of the cone of the milling cutter or punch used.
It is sometimes enough to show only a top view, and to indicate the presence of countersinks by a double circle, specifying ⌵ symbol the external diameter, the angle and the number of occurrences.
For example: "⌵ Ø 19 x 90°" (example here: https://www.gdandtbasics.com/countersink).

[Franck76]

Hello everyone, I am working on the design of sheet metal parts. Can anyone tell me how to indicate chamfers on my drawing?

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[Pierre-Yves Huet]

Hello,
For sheet metal parts, it is good to indicate countersinks/milling in 3 dimensions on the plans and to indicate the largest diameter as well as the angle. For an angle corresponding to a 45° chamfer (the most classic), one traditionally indicates a milling at 90°, which corresponds to the angle of the cone of the milling cutter or punch used.
It is sometimes enough to show only a top view, and to indicate the presence of countersinks by a double circle, specifying ⌵ symbol the external diameter, the angle and the number of occurrences.
For example: “⌵ Ø 19 x 90°” (example here: https://www.gdandtbasics.com/countersink).

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[Franck76]

Thank you for these explanations!

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[Manon Bouriaud]

If you have other questions about the types of hole drilling, do not hesitate to consult this white paper on the subject. It contains all the main reference symbols to use on your technical drawings and common applications https://xometry.pro/fr/guides/livre-blanc-types-trous-ingenierie/

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