Bac E Niger
Baccalauréat Série E — Mathématiques et Techniques (Niger)
Materials And FabricationEnglish
Exam overviewPractice session
A steel bar of diameter D = 40 mm is turned with a recommended cutting speed Vc = 25 m/min. Using Vc = π·D·N/1000 (D in mm, N in rev/min), what spindle speed N should be set?
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