CNC TECHNOLOGY: TOPIC 1-INTRODUCTION TO CNC

On CNC lathes, thread cutting is issentially done by

• Half nut

• Programmed instructions

• Universal dividing head

• None of the others

A point-to-point (P-T-P) control CNC machine

• Always has an interpolator

• Never has a position down counter for any axis of motion

• Never has DC motor as prime mover along any axis of motion

• None of the others

CNC programs are referred to as

• CAD

• Language

• Programming

• Gcode

Conventional machine requires

(more than one correct answer)

• eyes

• brain

• hands

• skills

CNC in machining technology stand for

• Cam Norton Control

• Cryogenic nano coolants

• Computer numerical control

• None of these

The main advantage of computer controlled automation over mechanical (e.g.,, cam controlled) automation is

• Glamour

• Flexibility

• Ability to apply higher speed feed depth to cut compared to those of conventionally controlled machine of same duty

• None of these

Disadvantages of CNC are

(more than one correct answer)

• Temperature, humidity & dust must be controlled

• Parts are imported from aboard

• Low machine costs

• Low tooling cost

This symbol is for

• R-reference point

• M-machine zero point

• W-work part zero point

• E-tool reference point

The most important advantage of CNC machining technology over conventional automatic machining is

• CNC machining technology is glamorous and brings good profits for its products

• CNC machining technology is flexible

• CNC machining technology only uses form tools which are cheaper

• None of these

When were CNC machines developed?

• 1940s and 1950s

• 1960s and 1970s

• 1930s and 1940s

• 1980s and 1990s