![]() The use of hard chrome clock arbors was and is, in my opinion, a very bad decision based partly on belief that the clocks would be serviced regularly. On the other hand, if the arbors are white metal, then chrome metal plating was used and the movement was made using "free machining steel" (soft) and chrome plated. ![]() If the arbors or shafts on your clock movement show signs of corrosion, the movement was probably made using old-fashion machine tools and hard tempered steel. After about twenty years, the thin chrome wears away leaving the soft steel exposed which wears rapidly. The chrome, although thin, was effective in protecting the soft steel for about twenty years use as clock parts. Soft steels are poor for clock parts so the industry chrome plated all the soft steel parts. For practical reasons, these high-speed machining tools required soft steels. Steel will always loose its brilliance when exposed to moisture laden air.īeginning in about 1960, nearly all manufacturing of clock parts were produced using numerically controlled machines. Know the difference between polished chromium metal and polished steel. ![]() Take a close look at the arbors (axles or shafts) of the works.
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