Compass Group UK & Ireland Interview Questions and Answers

There are various types of bearings used in spindle assembly including ball bearings, roller bearings, and angular contact bearings.

• Ball bearings are commonly used in spindle assemblies due to their high load capacity and low friction.

• Roller bearings are used for heavier loads and can handle both radial and axial loads.

• Angular contact bearings are used for high-speed applications and can handle both radial and axial loads.

• Ceramic bearings are also used in some spindle assembl...read more

Direct drive spindle is directly connected to the motor while belt drive spindle uses a belt to transfer power.

• Direct drive spindle has higher accuracy and faster response time.

• Belt drive spindle is less expensive and easier to maintain.

• Direct drive spindle is commonly used in high-end machines while belt drive spindle is used in low to mid-range machines.

• Examples of direct drive spindle machines include Mazak Integrex and Okuma Multus while examples of belt drive spindle mac...read more

VMC is a vertical milling center while HMC is a horizontal milling center.

• VMC has a vertical spindle orientation while HMC has a horizontal spindle orientation.

• VMC is ideal for drilling and milling while HMC is best for heavy-duty cutting.

• VMC is more compact and takes up less floor space than HMC.

• VMC is generally less expensive than HMC.

• Examples of VMC include Haas VF-2 and DMG Mori CMX 1100 V while examples of HMC include Mazak HCN-5000 and Okuma MA-600HII.

G94 code in CNC programming represents feed per minute mode.

• G94 code sets the feed rate to be interpreted as inches per minute or millimeters per minute, depending on the unit system being used.

• It is commonly used in milling operations to control the feed rate of the cutting tool.

• For example, G94 F100 sets the feed rate to 100 units per minute.

To convert a lathe machine into an automatic machine, you can add CNC controls and motors for automated operation.

• Install CNC controls to automate the movement of the cutting tool

• Add motors to control the movement of the workpiece

• Implement sensors for feedback and monitoring

• Program the CNC system to execute the desired operations

• Test and calibrate the automatic functions for accuracy and efficiency

Computer numerical control system is a system in which a computer controls the movement and operation of machines.

• Uses coded instructions to control the movement of machinery

• Commonly used in manufacturing processes like milling, drilling, and cutting

• Improves precision and efficiency compared to manual operation