Ohio Machinist Level 1 Exam Practice

Ohio Machinist Level 1 Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• What is the standard unit of measurement in the U.S. customary

system for length?

• Meter
• Centimeter
• Inch
• Millimeter

Rationale: Inches are the standard unit of length in the U.S.

customary system, commonly used in machining.

• What is the function of a micrometer?
• Measure angles
• Measure precise linear dimensions
• Measure temperature
• Measure weight 1 / 4

Rationale: Micrometers are precision measuring tools used to

measure linear dimensions with high accuracy.

• Which material is most commonly used for making cutting tools?
• Aluminum
• High-speed steel
• Brass
• Plastic

Rationale: High-speed steel is commonly used for cutting tools due to

its hardness and heat resistance.

• What does OSHA stand for?
• Occupational Safety Hazard Association
• Occupational Safety and Hazard Administration
• Occupational Safety and Health Administration
• Organization for Safety and Health Awareness

Rationale: OSHA sets and enforces safety standards in workplaces,

including machining shops.

• Which part of a lathe holds the workpiece?
• Tool post
• Tailstock spindle
• Chuck
• Carriage

Rationale: The chuck is mounted on the lathe spindle and holds the

workpiece securely during machining. 2 / 4

6. A tool steel is primarily hardened to:

• Increase toughness
• Resist wear and maintain cutting edge
• Reduce weight
• Increase ductility

Rationale: Hardening tool steel increases wear resistance and allows

it to maintain a sharp cutting edge.

• What is the correct formula for calculating RPM on a lathe?
• RPM = Feed × Depth
• RPM = (CS × 4) / Diameter
• RPM = Speed × Torque
• RPM = Feed × Speed

Rationale: The lathe RPM formula depends on cutting speed (CS) and

workpiece diameter, typically RPM = (CS × 4) / Diameter.

• What is the purpose of a drill press table?
• Hold cutting fluid
• Hold the drill bit
• Support the workpiece during drilling
• Rotate the spindle

Rationale: The drill press table supports the workpiece in the correct

position while drilling.

• What type of fit allows slight clearance between two mating parts?
• Interference fit 3 / 4

• Clearance fit
• Press fit
• Tight fit

Rationale: A clearance fit allows parts to move or slide freely with

minimal friction.

• Which of the following is a primary cutting operation?
• Deburring
• Polishing
• Turning
• Grinding

Rationale: Turning is a primary machining operation that removes

material to shape a workpiece.

• What is the purpose of a reamer?
• Cut threads
• Drill holes
• Finish holes to precise size
• Chamfer edges

Rationale: Reamers enlarge and finish drilled holes to an accurate

diameter.

• What is the main difference between ferrous and non-ferrous

metals?

• Color
• Density
• / 4