Cast iron question

[MWF FEED]

If I get a pattern made and a foundry to cast off that in cast iron . I’m told or have read that the cast iron chills or is a lot harder on the outside skin and this has an effect on milling the machined surfaces . So it’s cast thicker where it’s to be milled so your machining through the hard stuff into softer stuff .

Question . If you get a cast part and heat it right back up red hot then anneal the whole thing by burying it and cooling very slowly . Does that get rid of the hard skin ?
Allowing easier machining ?

Rob


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