Transcription of DIMENSIONAL CONSIDERATIONS FOR ALUMINUM Hard ... - Danco
1 Metal surfacinganodizingALUMINUM FINISHING AND ANODIZING FOR PROTECTION, WEAR AND APPEARANCET here are other factors which may affect the application of anodized coatings or the base product after anodizing. Please consult with our technical support staff. 1997 DANCO44 La Porte , CA 91006626-445-3303 Fax: 626-445-31351750 Monticello CourtOntario, CA 91761909-923-0562 Fax: 909-923-5325401 W. RowlandSanta Ana, CA 92707714-557-2411 Fax: 714-557-040850% PENETRATIONOF COATINGUNCOATED SURFACEOF PART50% GR0 WTHOF COATINGTOTALCOATINGTHICKNESSPENETRATIONR EMAINSDIAMETERMAY BEGROUNDFOR SIZECONTROLTHIN AREAMASKED FULLSIZE THREADSWITHOUT COATINGUNDERSIZEDTHREADSCOATED TOFULL SIZEHTWORGSSENKCIHTDEDNEMMOCERSUIDAR" "30." "60." " Information RequiredDIMENSIONAL CONSIDER ATIONS FOR ALUMINUMHard Anodized CoatingsCORNER VOIDINSIDECORNERSAND THREADSFILL SLIGHTLYCOATINGPENETRATIONRADIUS CORNERSFOR EVEN COATING1. Blueprints are especially helpful for use in masking, and fordetermining critical areas that should be avoided during theracking Coating thickness, and tolerance required.
2 Be sure to specif ytotal thickness and all critical finished dimensions of the Type of Any special handling most of our work is critical tolerance, a number ofdimensional factors must be considered in order to achieve thedesired A NODIZED THICK THE 50/50 RULE A hardanodized finish is divided approximately 50% as a coating abovethe base metal (called growth ), and 50% penetration belowthe surface of the part. This principle tends to hold true for mostalloys and coating thicknesses. For example, this means that a .002" coating will add " to each surface of the THREADS The build-up on each surface changes the pitchdiameter faster than typical two-surface diameters. It may bedesirable to machine the threads undersize before anodizing, ormask the thread area before CORNERS Since the coating grows (and penetrates)perpendicular to the surface of the part, sharp corners, bothoutside and inside, and edges can be a problem.
3 To obtain auniform coating, they should have a .005" to .050" radius,depending on the anodized thickness TOLER A NCE Precise control can normally be maintainedon thickness. Coating thickness can range from .0005" to .0035"as specified. (This is the combined surface and penetrationthickness.) Tolerance is normally 10% of the total thickness,but not less than .0001". Tighter tolerances may be possiblethrough special tooling, or source inspection during : Direct verbal communication with theShop Supervisor or Foreman is also Deelyn , IN 46580574-269-5900 Fax: 574-269-5966
