When castings with surface scale are being turned in an engine lathe, how is the first roughing cut taken in terms of depth of cut and feed?

Question

Accepted Answer

a relatively heavy depth of cut deep enough to get under the scale should be used along with a relatively fine feed

Answer

a relatively light depth of cut only deep enough to incrementally remove the scale in several passes along with a relatively fine feed

Answer

a relatively light depth of cut only deep enough to incrementally remove the scale in several passes along with a relatively coarse feed

Answer

a relatively heavy depth of cut deep enough to get under the scale should be used along with a relatively coarse feed

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