Exam Practice Questions And Correct

NIMS Machining Level II Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which of the following best describes the primary purpose of a surface

grinder?

• Cutting external threads
• Producing smooth, flat surfaces with precision
• Drilling holes into hard materials
• Shaping internal bores

Rationale: Surface grinders are designed to achieve high accuracy and fine

finishes on flat surfaces through the use of abrasive wheels.

• What is the main advantage of using carbide cutting tools over high-

speed steel (HSS) tools? 1 / 4

• Lower cost
• Higher toughness
• Higher cutting speed and wear resistance
• Easier to sharpen

Rationale: Carbide tools can operate at higher speeds and maintain

hardness at elevated temperatures, improving tool life and productivity.

• What is the recommended procedure when setting the zero point on a

milling machine?

• Using the machine table corner as reference
• Touching off the tool on the workpiece and setting digital zero
• Measuring from the spindle center to the edge
• Estimating the distance from the drawing

Rationale: Touching off the tool allows accurate determination of the work

coordinate zero point for machining operations.

• What is the function of backlash compensation in CNC machining?
• To reduce tool chatter
• To correct for mechanical play in drive systems
• To prevent tool deflection
• To increase feed rates

Rationale: Backlash compensation ensures precise positioning by

accounting for small gaps in lead screws or drive mechanisms. 2 / 4

5. The feed rate in milling operations is typically expressed in:

• Inches per revolution
• Inches per minute
• Surface feet per minute
• Inches per tooth

Rationale: Feed rate (IPM) measures how far the tool moves across the

workpiece surface in one minute.

• Which cutting fluid is most appropriate for machining aluminum?
• Heavy mineral oil
• Dry machining only
• Water-soluble oil emulsion
• Sulfurized oil

Rationale: Water-soluble oils provide good cooling and prevent built-up

edge formation common with aluminum.

• What is the best way to reduce tool chatter during turning?
• Increase cutting speed
• Reduce tool overhang
• Use a larger depth of cut
• Increase feed rate 3 / 4

Rationale: Reducing tool overhang increases rigidity and minimizes

vibrations that cause chatter.

• In a G-code program, the command G43 typically performs which

function?

• Selects work offset
• Cancels tool length offset
• Applies tool length compensation (positive direction)
• Starts spindle rotation

Rationale: G43 activates tool length compensation in the positive direction

using the specified offset value.

• Which measuring instrument would be most suitable for checking a

0.0002" tolerance on a shaft diameter?

• Vernier caliper
• Steel rule
• Micrometer
• Depth gauge

Rationale: Micrometers provide the precision and resolution needed for

very tight tolerances.

• / 4