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Digital > Machining Operations, CNC, CAM software, Lastest development > Flashcards

Machining Operations, CNC, CAM software, Lastest development Flashcards

1
Q

For turning what is the equation for rotational speed, feed rate and volumetric material removal rate?

A

N=v/(πœ‹π·0)

fr=Nf

MRR=vfd

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2
Q

For drilling what is the equation for rotation speed, feed rate and volumetric material removal rate?

A

N=v/πœ‹D0

fr=N*f

MRR= (πœ‹π·^2)*fr/4

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3
Q

For milling what is the equation for rotation speed, feed rate and volumetric material removal rate?

A

N=v/Ο€D

fr=NZf or f=fr/NZ

MRR=frdw

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4
Q

What is part programming?

A
  • Using a computer program containing a number of lines, instructions or statements called NC BLOCKS
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5
Q

What are the 6 parts of a part programming?

A

1) Sequence number
2) Preparatory function
3) Interpolation function
4) Miscellaneous function
5) Spindle speed function
6) tool function
Spastics Poo In My Special Toilets

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6
Q

What does the first block do in a typical NC program?

A

Block sequence number

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7
Q

What does the Second block do in a typical NC program?

A

G- preparatory functions

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8
Q

What does the Third block do in a typical NC program?

A

X, Y, Z, coordinates for motions

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9
Q

What does the Fourth block do in a typical NC program?

A

Miscellaneous function

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10
Q

What does the 5th block do in a typical NC program?

A

Spindle Speed

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11
Q

What does 6th first block do in a typical NC program?

A

Tool number

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12
Q

What is linear interpolation?

A

Uses G01 where the velocities of two axes are controlled to keep the tool on a straight path in a plane of motion

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13
Q

What is Circular interpolation?

A

G02 is clockwise
G03 is anticlockwise
The next two types are radius arc: N010 G90 G03 X30 Y65 R45
centre arc’s: N010 G90 G03 X30 Y65 I-45 J0

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14
Q

What is used instead of NC?

A

CAM! Can do all the long bits you cant be arsed for!

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15
Q

What are the four-man strategies for 2D machining?

In order

A

Facing
Drilling and hole making
2D Contouring
Pocketing

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16
Q

What are the high-speed, very high speed and ultrahigh speeds for cutting speed?

A

High speed: 600-1800 m/min
very high: 1,800-18,000 m/min
Ultrahigh speed >180,000 m/min

17
Q

What are some characteristics for spindles with high speeds?

A

High stiffness
High accuracy
Hydrostatic/aerostatic are desirable

18
Q

What are some requirements for building precision machine tools?

A
  • Highly damping capacity
  • Thermally stable
  • Dimensionally stable in liquids

Candidates: cast iron, polymer concrete, natural granite

19
Q

What are some considerations for precision and ultra-precision machining?

A
  • Tool design/construction/assembly (e.g stiffness, damping, accuracy)
  • Spindle and slide-way technology such as hydrostatic
  • Thermal growth of the machine tool, compensation for thermal growth control of the machine-tool environment
  • Cutting-tool selection and application- ceramic and diamond tools are commonly used
  • Motion control and sensor system forr both linear and rotational components
20
Q

What are some of the application for micro-machining?

A
  • Create 3D components or features
  • Smart phone, medical devices, automotive
  • Product miniaturisation demands innovative micro-machining technologies
  • Competing with and complementing other micro manufacturing approaches
21
Q

What are some ADVANTAGES of micro-machining?

A
  • Broad range of workpiece materials
  • True 3-dimensional accuracy and surface finish
  • High dimensional accuracy and surface finish
  • Easy setup, low cost and suitable for small/medium batch direct manufacture or making moulds for mass production
22
Q

What are some DISADVANTAGES of micro-machining?

A
  • Need to have much higher spindle speeds
  • Harder to achieve good surface quality
  • Edge quality
    Low tool life
23
Q

Name some commonly used micro milling tools:

A 
Tungsten carbide
Coated tools
CBN tools
PCD (polycrystalline diamond) tools
CVD (chemical vapour deposition) diamond
Natural diamond tools

D=50(*10^-6) - 1mm

24
Q

What are the three main aspects in green machining?

A

Resources
Lower costs
Maintaining health environments

25
Q

What are some examples of green machining?

A

Traditional flood coolant
Dry machining
Minimum quantity lubricant
Cryogenic machining

Digital (4 decks)

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