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Surface roughness - aluminum vs cast iron

Comparing between surfaces of aluminum extrusion 6061 T6 and cast iron, which does have suitable surface roughness if the material is used for machining a pulley ( V-belt driving )?

Kindly give your opinion.

Norhaidi
- Subang, Selangor, Malaysia
2002

There are advantages and disadvantages of each. I think a better question might be in what environment is the pulley going to be working in. Two of the more common thoughts that come to my mind are: Alum is a softer material and may distort with too much pressure and especially in a hot environment. Iron, if not properly treated, will rust in a wet environment.

AF Kenton
retired business owner - Hatboro, Pennsylvania
2002

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