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topic 426

Finishing of Metal Calibration Targets


(1996)

Hi

I would like some advice on how to finish some metal calibration targets (these are just metal bars). Our requirements are as follows:

1. Dimensions: 2" x 1/4" x 1' (up to 3').
2. Aluminum surface (only one side matters)
3. Aluminum surface can be machined or finished in whatever manner is required to make the best finish.
4. Finish requirements are:

1. Very flat (diffuse reflector) finish.
2. High degree of repeatability of color/gloss from one specimen to the next.
3. High uniformity of color/gloss across the piece.

Which type of finish would be recommended ?

1. Spray painting
2. Electrostatic powder
3. Anodization
4. Other ?

thanks

Ron

Ron Lake
- Delta, B.C., Canada


(1996)

Hi, Ron.

I'm not sure that I fully understand all of the parameters that you require, but I would probably brush finish, etch, and anodize them on the belief that an anodized finish is more durable than an organic coating. You could also silkscreen a very durable grid on them before anodizing, which might both serve the function of making them look like something and in some future iteration allow you to double-check a distance optically.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


(1996)

You may want to consider an abrasive blasting operation followed by hard anodizing. This would provide a uniform, non-reflective surface that is also abrasion resistant and electrically dielectric.Note: hard anodizing provides a black integral coating, especially on 6000 series aluminum
Kent

Kent Backus
Fort Worth, Texas, USA



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