Coin edge finish

Can you describe what a"coin edge" finish is?

This is not regarding metal coins but in a fixture finish such as an elevator faceplate with the buttons.

Jim Loomis
Shop employee - Vacaville, California
July 1, 2011

Perhaps it is very much like v-beads, also called v-grooves or flutes. It used to be frequent on plastic injected auto lamps years ago as a decorative motif around the light area. It is produced by a technique called mold texturing and is produced by etching with acids the area with the aid of a resist which has the desired b&w pattern (line and separation). The acid etches away the metal on the areas left exposed by the resist.
G. Marrufo-Mexico

Guillermo Marrufo
Monterrey, NL, Mexico
August 11, 2011

Years ago we worked on Mil spec parts that were punched out of SS sheet. This left a rather abrupt 90 on the top surface and sometimes a knife edge on the bottom one, so all of the edges had to be "coined". This was a pass thru another set of "punches" that rounded the edges.

James Watts
- Navarre, Florida
August 12, 2011

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