NIMS: Turning Questions with Complete

NIMS: Turning Questions with Complete

Solutions (Latest 2025)

Which of the following statements best defines cutting speed:

• Cutting speed is based on RPM and is the amount of times

a tool revolves in 1 second

• Cutting speed is based on the diameter of the tool and is

given in surface revolutions per minute

• Cutting speed is based on the distance the work moves

past the tool based on the number of feet that passes the tool in one minute and is given in surface feet per minute

• Cutting speed is based on revolutions per diameter of the

tool and is given in feet per inch - Correct Answers ✅C Which of the following statements best defines feed?

• The machine movement that causes a tool to cut into or

along the surface of a work piece

• The distance the work piece moves past the tool in one

minute

• The revolution of the tool per minute
• The diameter of the tool correlated to the distance the tool

moves in one second - Correct Answers ✅A When calculating the RPM for a turning operation, the machinist uses _______instead of the diameter of the tool. 1 / 3

NIMS: Turning Questions with Complete

Solutions (Latest 2025)

• A Tool nose radius
• The diameter of the work piece
• Cutter speed compensation
• Surface feet per minute - Correct Answers ✅B

What is the RPM needed to drill a 0.750" diameter hole in mild steel with a cutting speed of 100 SFM on 3.50" diameter stock (use 3.82 for the constant)?

A) 262.5 RPM

B) 286.5 RPM

C) 123 RPM

• 509 RPM - Correct Answers ✅D

A part is being turned at 250 RPM with a feed rate of 0.008 inches per revolution. How long will it take to make one pass if the part is 10.625 inches long?

• 4.25 minutes
• 5.30 minutes
• 1.75 minutes
• 2.10 minutes - Correct Answers ✅B 2 / 3

NIMS: Turning Questions with Complete

Solutions (Latest 2025) Identify the proper formula for determining the RPM for a

turning operation:

A) (CS X 3.82)/D

B) D/(CS/3.82)

• (D X 3.82)/cs
• (D X cs)/3.82 - Correct Answers ✅A

How is a feed rate designated on a lathe?

• Feet per second
• Inches per minute
• Feet per revolution
• Inches per revolution - Correct Answers ✅D

The feed rate is at 0.008 IPR. How many RPM will it take to move the tool a distance of 3.600 inches in a minute?

A) 288 RPM

B) 225 RPM

C) 576 RPM

• 450 RPM - Correct Answers ✅D
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