cnc machines

Question 1

what are the types of production?

Answer 1

1. prototype: 1-10→all types of objects
2. small batch: 10-4999→air crafts
3. high volume:5000-10000→agriculture machinary
4. mass production: >100000→automotive

Question 2

how is automation achieved?

Answer 2

• the machine monitors and makes descisions for:

1. manifacturing
2. assembly
3. packing
4. inspection

Question 3

What are the type of CAE and their functions in order?

Answer 3

1. CAD(design): for drawing the object on a computer system
2. CAM(manufactring): for simulating the making of the object
3. CAPP(prosses planning): the making of prosses and operation sheet
4. CIM(integrated manufacturing):Production, Handling, Mounting, Storage, Transportation
5. CAP(planning):
6. PPS(production planning and steering):
7. CAQ(quality): quality control

Question 4

what are the factors for a good product?

Answer 4

1. quality
2. cost
3. low production time

Question 5

steps of creating an nc program?

Answer 5

1. geometry
2. sequence of operations
3. tools
4. cutting conditions
5. run

Question 6

adaptive control?

Answer 6

1. much faster than normal control
2. improves production rate
3. reduces waste and increases efficiancy
4. lower cost
5. higher quality

Question 7

what is g code?

Answer 7

geometric code used to give instructions to the cnc machine

Question 8

absolute dimensions?

Answer 8

machine moves from origin to each point

Question 9

incremental dimensions?

Answer 9

machine moves from point to point

Question 10

points of refrence?

Answer 10

• machine zero: at zero point
• workpiece zero: zero point at workpiece starting position
  *

Question 11

tool motion?

Answer 11

• point to point(PTP): drilling and reaming
• continous path: facing and contouring

Question 12

geometrical code functions?

Answer 12

• G⇒geometrical position
• S⇒spindle speed
• F⇒feed
• XYZABC⇒ axis
• T⇒tool
• M⇒tool change

Question 13

safe start?

Answer 13

• G00⇒rapid motion mode
• G90/G91⇒absolute position/ incremental postion
• G17⇒XY plane
• G54⇒ fixture offset 1
• G40⇒cutter compensation
• G49⇒length offset cancel
• G80⇒ canned cycle cancel