10+ CNC Machinist Interview Questions and Answers

Yes, I have programming knowledge and can prove it in your drawing.

• I am proficient in G-code programming

• I have experience with CAD/CAM software such as SolidWorks and Mastercam

• I can read and interpret technical drawings and blueprints

• I have successfully programmed and machined complex parts with tight tolerances

• I am familiar with various cutting tools and their applications

A system in thermodynamics refers to a specific region or object under observation.

• A system can be classified as open, closed, or isolated based on the exchange of matter and energy with the surroundings.

• An open system allows both matter and energy to be exchanged with the surroundings, while a closed system only allows energy exchange.

• An isolated system does not allow any exchange of matter or energy with the surroundings.

• Examples of systems include a piston-cylinder, a refr...read more

Entropy is the measure of disorder or randomness in a system. Enthalpy is the measure of heat energy in a system.

• Entropy is a thermodynamic property that increases with the degree of disorder in a system.

• Enthalpy is the sum of the internal energy of a system and the product of its pressure and volume.

• Entropy is often associated with the second law of thermodynamics, which states that the total entropy of a closed system always increases over time.

• Enthalpy is commonly used in ...read more

RPM stands for revolutions per minute and refers to the speed at which a machine's spindle or cutting tool rotates.

• Types of machines include lathes, mills, drills, and grinders

• Types of cutting tools include end mills, drills, taps, and inserts

• RPM is an important factor in determining the cutting speed and feed rate for a given material and tool

• Different materials and tools require different RPMs for optimal performance

The first angle symbol is a triangle with one corner pointing upwards.

• The symbol is used in engineering drawings to indicate the orientation of a part or feature.

• It is also known as the 'European' or 'ISO' symbol.

• The symbol is drawn with a solid line for visible edges and a dashed line for hidden edges.

• Example: ▲

A drawing of a simple rectangular block with holes on each face

• Create a 3D model of the block with holes in a CAD software

• Export the model as a STEP or IGES file

• Import the file into CAM software and create toolpaths for each hole

• Generate G-code from the toolpaths and load it onto the CNC machine

• Run the program and verify the dimensions of the machined block

1 inch is equal to 25.4 millimeters and 2.54 centimeters.

• 1 inch = 25.4 mm

• 1 inch = 2.54 cm

The control used in CNC machining depends on the specific machine and its manufacturer.

• Different CNC machines use different controls, such as Fanuc, Haas, Siemens, or Mazak.

• The control system is responsible for interpreting the CNC program and executing the machining operations.

• Each control has its own programming language and features.

• Operators need to be trained on the specific control used in their machine.

• Examples of controls include Fanuc 0i, Haas NGC, Siemens Sinumerik,...read more

Cogsdill tool attachment is used in CNC machining for precision hole finishing and deburring.

• Cogsdill tool attachments are used to achieve precise hole finishing and deburring in CNC machining.

• These attachments are designed to fit into the CNC machine and perform operations like reaming, burnishing, and chamfering.

• They are commonly used in industries like aerospace, automotive, and medical device manufacturing.

• Cogsdill tools can be used for both internal and external hole fin...read more

Types of fit refer to the degree of tightness or looseness between two mating parts.

• Clearance fit: parts are intended to have a gap between them

• Interference fit: parts are intended to be pressed or forced together

• Transition fit: parts have a combination of clearance and interference fit

• Examples include press fit, slip fit, and force fit

M6 drill size refers to the diameter of the drill bit used for making holes with a metric thread size of 6mm.

• M6 drill size is commonly used in manufacturing and engineering industries.

• The diameter of the drill bit for M6 size is approximately 5.2mm.

• M6 drill size is used for creating holes in materials such as metal, plastic, and wood.

• It is important to use the correct drill size to ensure the hole is the correct size and the thread fits properly.

Loss time can be reduced by implementing efficient processes and minimizing downtime.

• Implementing preventive maintenance schedules

• Optimizing tooling and equipment setup

• Reducing setup and changeover times

• Minimizing machine breakdowns through regular inspections

• Providing training to operators to improve efficiency

• Using automation to reduce manual labor

• Improving communication and coordination between departments

• Implementing a continuous improvement program

• Encouraging a culture o...read more