Re: Polishing a rough cast aluminum valve cover... what tools and where to start???
there is no exact science that will say how much material in how much time will be removed , too many variables , type of aluminium castings ,some softer than others , what you call moderate pressure could be light pressure for me , size and width of wheel, speed of wheel ,how dry is the greasless on the wheel , part shape,.
when you change grits try to polish on a different angle when possible , that will help cut the previous polishing lines and it will be easier for you to see if you removed all the polishing marks left by the previous grit
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