You're on the shop floor doing a first-piece check and you google "verify rpm and feed before estimating lathe machining time" — before trusting the calculated turning time, what sequence of checks makes the estimate valid?

Question

Accepted Answer

Option A would let an RPM–diameter mismatch slip through because cutting starts before verification. Option B masks gearbox or CNC scaling errors and corrupts the feed basis. Option D confuses quality acceptance with time validation and misses setup losses. Option C locks diameter, RPM, and feed in the same state as the estimate before metal is cut.

Estimation of machining time for Lathe machine operations

Ashok Khopkar

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