Chapter 16 Flashcards Preview

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Flashcards in Chapter 16 Deck (36):
1

What two factors decide characteristic part geometery

Relative motion b/w tool and workpart.

Shape of the cutting tool

2

What is generating

Generating - part geom determined by feed trajectory of cutting tool

3

What is forming (3)

Forming - shape of cutting tool determines the geometry of the part.

Form turning, drilling, and broaching

4

What is turning? Name some (9).

Single point cutting tool.
Rotate the workpiece.
Lathe.

Facing, taper turning, contour turning, form turning, chamfering, cutoff, threading, boring, drilling

5

What is a turret lathe

Six tools instead of the tailstock.

High production that requires sequence of cuts

6

What is chucking machine

Chuck hold workpart.
Operator only load/unloads parts.
Short, light weight parts

7

What is a bar machine

Collet hold workpart usually a bar.
Cutoff after operation.
Highly automated. CNC.

High prod of rotational parts

8

What is an automatic screw machine

Same as bar machine but smaller.

High prod of screws and similar hardware items

9

What are multiple spindle bar machines

>1 spindle
Multiple parts machined then rotated.

10

What is the six spindle bar machine process

Feed stock.
Turn main D
Form second D and spotface
Drill
Chamfer
Cutoff

11

State Chuck for lathe (2)

3 Jaw
Easy to locate. Self centering. Only round part.

4 Jaw
Long time to locate. Rect part. Eccentric turning.

12

State Lathe steadies or rests

Steady Rest and Follower rest
Support long jobs.

13

Lathe Centres

Support at tailstock.
Dead centre or revolving centre

14

Explain boring

Inside diameter of existing hole to make larger. Horizontal or vertical

15

Explain Drilling and simlilar (6)

Creates a round hole unlike boring.

Reaming, tapping, counterboring, countersinking, center drilling, and spot facing.

16

How to hold workpart for drill presses? (3)

Vise - two jaws

Fixture - Custom-designed for part

Drill jig - custom-designed and guides the tool during drilling

17

What is milling? Explain difference b/w peripheral and face

Workpart moves; multiple cutting edges tool fixed.

Peripheral - Cutter axis parallel to surface

Face - Cutter axis perpendicular to surface.

18

Name peripheral mills (5)

Slab
Slotting
Side
Straddle
Form

19

Name face mills (6)

Conventional
Partial
End
Profile w/ end mill
Pocket
Contour

20

Name the two mills

Horizontal - peripheral

Vertical knee-and-column

21

What is a machining center?

3, 4, 5 axes. CNC control. Automated.

22

Mill-turn center vs conventional turning center (2)

Position cylindrical part at an angle. Includes rotating tool spindles.

23

Process of Mill-turn center (4)

Turn second D
Mill flat
Drill hole
Cutoff

24

Diff b/w down and up milling

Down: Same direction as workpart. Good surface finish.

Up: Opposite direction of workpart. More safe since amount of material taken off smaller so less chance of breaking tool.

25

Diff b/w shaping and planing (3)

Shaping: Workpart moves feed. Smaller pieces 1 to 2m.

Planing: Tool moves feed. Large pieces 10m. Only stroke cuts so not efficient

26

Explain broaching process and characteristics (6)

Seq. - Roughing, semi-finishing, and finishing teeth.

Internal or external
Good finish, accurate dim, expensive but one pass. Made from steel since mainly tension, starter hole and through features only

27

Explain sawing. Name saws (3)

Cuts narrow slit in work.

Power hacksaw - linear reciprocated/one direction. Short, rigid

Band Saw - Linear continuous motion. Flexible, irregular shape, aluminum

Circular Saw - Rotating saw. Continuous. Ceramic.

28

Describe teeth type

Straight - Copper or brass

Raker - Steel and iron

Wave - Thin sheet

29

Describe Filing. Name four.

Fine wide teeth. Small chips. Finishing/deburring

Single, Double, Rasp, Vixen

30

Name three burs

High speed steel
Carbide
Rotary

31

What is HSM: DN ratio

Bearing bore diameter mult by max spindle speed

1 mil to half a mil

32

What is HSM: HP/RPM

Ratio of hp to max spindle speed.

33

Req. for high speed machining (6)

Special bearing
High feed rate
CNC controls
Balanced tools
Coolant delivery that give higher pressure
Chip control

34

What determines surface roughness? (3)

Geometric factors - Type of machining operation. Tool geom and feed.

Work material factors - Built-up edge effects. Crack in surf or friction b/w flank and surface.

Vibration and machine tool factors - Tool chatter. Backlash in feed mechanism.

35

How to avoid tool chatter (5)

Dampen or stiffen
Speeds not within natural frequence.
Reduce feeds and depths
Change cutter design
Cutting fluid.

36

Product design guidelines

What to avoid and what to have

close tolerances
good surface finish

Avoid sharp corners, edges and points. Avoid anything that can't be achieved with standard cutting tools.

Choose material with good machinabilty since shorter and cheaper to produce