My project requires a combination of chem-film for electrical conductivity in specific areas, anodizing for enhanced corrosion resistance, and bead blasting for a uniform matte appearance. My challenge is to effectively communicating these requirements on the technical drawing to ensure the finishing process is executed correctly without any misinterpretations by the finisher. My current plan is to apply a chem-film layer selectively on certain mounting points and edges that require grounding, while the rest of the part will undergo anodizing. Additionally, I want a bead-blasted matte finish applied to the entire visible surface, except for the masked chem-film areas.

For those who’ve dealt with similar requirements, what’s the best way to call out these finishes on the drawing? I’m thinking of using distinct masking symbols or a detailed finishing note but would appreciate any advice on standard practices or recommendations. Also, is there any concern with bead blasting over anodized sections in terms of wear or appearance consistency? Thank you!