First Midterm Flashcards
0
Q
Dial calipers subdivisions
A
100ths on main scale and .001 on dial gauge
1
Q
3 uses of a dial caliper
A
Linear measurements
Outside and inside diameters
Depth
2
Q
Charc of Micrometer
A
Thimble has 25 subdivisions and the least count is .0001
3
Q
Least count
A
Smallest measurements that your tool will measure to
4
Q
Roughness average
A
Pertains to surface finish
Higher the number the rougher the finish
5
Q
Feeler gauges
A
Used to set reference planes
6
Q
Screw ring gauge
A
Used to gauge thread
7
Q
.50-13 UNC-2A
A
A- external thread B-internal thread 1-loose threads 2-middle class 3- tightest threads
8
Q
Thread plug gauge
A
Only for internal threads
9
Q
Ring gauge
A
Used for shaft or post(go/no-go)
10
Q
Profilometer
A
Gauges surface roughness
11
Q
Gauge blocks
A
Standard measurements to set a micrometer
12
Q
Surface plates
A
Datum to measure from
13
Q
Telescoping gauges
A
Spring loaded and used for holes
14
Q
Spring caliper
A
Rough measurement of diameter
15
Q
CMM
A
Uses coordinates to measure 3-d of any part
16
Q
Engine lathe
A
Not a production lathe. Primarily for single piece or short runs
17
Q
Turret lathe
A
Used for duplicate parts
18
Q
Lathe size
A
By largest working diameter and max distance btw centers
19
Q
Headstock of lathe
A
Clamped on left hand end of bed
Provides drive of workpiece
20
Q
Carriage of lathe
A
Used move cutting tool along lathe bed Consists of Saddle-mounts cross-slide and apron Cross-slide Apron
21
Q
Cross-slide
A
Provide movement of cutting tool
Compound slide is also attached
22
Q
Apron
A
Moves carriage along lathe bed
23
Q
Tail stock
A
Provide support for right hand end of workpiece
24
Shear pins and slip clutches
Prevents damage to feed mechanism from overload or sudden torque
25
Cutting conditions for turning
Cutting speed (v). Feed (f). Depth (d)
26
Spindle speed
Rpm = (CS x 4)/ d
27
Feed rate for turning
Rough feed - .0115(in/rev)
| Finishing feed - .002- .004 (in/rev)
28
Key machining operation
Turning. Drilling. Milling
29
Milling
Rotating multiple cutting edge tool is moved across work to cut a plane
30
Three basic types of chips
Continuous chips
Continuous chips with built up edge (BUE)
Discontinuous chip
31
Continuous chip
Ductile work material
High cutting speed
Small feed and depth
32
Continuous with BUE
Low to med speed
| Tool chip friction causes chips to break off and adhere to rake face
33
Single point cutting tool
Point usually rounded form nose radius
| Turning uses this
34
Multi point cutting tool
Motion relative to work achieved by rotating
Drilling and milling use this
Feed rate is measured by workpiece fed into cutting tool
35
Back rake angle
Allows chips to flow
36
Positive rake angle
Better surface finish
| When side rake angle is below cutting edge
37
Negative rake angle
Side rake angle is above cutting edge used for roughing and harder materials
38
Ductile
Stretches without breaking
39
Malibility
Compression
| Better compression equals higher precision
40
Material properties of cutting tools
Cutting and forming
41
Principle materials of cutting tools
Non metallic
Ferrous
Non ferrous
42
Basic property for every cutting tool
Wear resistance
43
Cubic boron nitride
Next to diamond in hardness
44
Band saw advantages
Fast
Large work pieces
Most narrow kerf
45
Band saw disadvantages
High tool cost
Not accurate
Poor finish
46
Band saw applications
Any soft metal
| Any shape
47
The set of band saw blade
How far each tooth is bent
48
Cold saw disadvantages
High machine cost
Limited workpiece size
Large kerf loss
49
Cold saw advantages
Very accurate
Good surface finish
High productivity
Long tool life
50
Cold saw applications
Structural shapes
| Thin walled sections
51
Abrasive saw advantages
Cuts metal of any hardness
| Good surface finish
52
Abrasive saw disadvantages
Short tool life
| Limited workpiece size
53
Abrasive saw applications
Hardened steel
| Ceramics
54
Orientation for cross sectional cuts
Orient for the most tooth engagement
55
End milling
Has teeth on end and sides used cut slots
| Most versatile and Flexable cutter
56
Ball mill
Used cut trough
57
Horizontal milling cuts
Slotting. Slitting. Form milling. Straddle milling. Slab milling.
58
Up milling
Conventional milling. Gives a rougher finish
59
Down milling
Mostly used in production. Better finish
60
Characteristics of abrasives
Hardness
Abrasion resistance
Compressive strength
Thermal conductivity
61
Type 1 surface grinder
Horizontal spindle with reciprocating table
62
Type 2 surface grinder
Horizontal spindle with rotary table
63
Type 3 surface grinder
Vertical spindle with rotary table
64
Type 4 surface grinder
Vertical spindle with reciprocating table
65
Dielectric fluid
Flushing to remove chips. Oxygen shield. Serves as coolant
66
Edm parameters
Amperage. Frequency. Flushing. And arc gap
67
Effect of changing amperage
Increase amps gives smother finish
68
Adv of EDM
Cuts any hardness. Leaves no buts. No cutting forces. Capable of complex geometry
69
Absolute tool positioning vs incremental
Absolute is based off of the origin while incremental is based off of the last cut
70
Programming character
Alpha numeric character
71
Address.
Letter that describes meaning of numeric value following the address
72
Words
An address followed by a number
73
Blocks
One complete line of info
74
S-code
Spindle speed
75
F- code
Sets tool feed rate
76
M-codes
Machine function
77
G-codes
Preparatory functions
78
N or sequence number
Serves as a tag for each block
79
G00
Rapid travel
80
G01
Linear interpolation
81
G02
Circular interpolation clockwise
82
G03
Circular interpolation counter clockwise
83
G20
Inch mode
84
G80
Cancel canned cycle
85
G90
Absolute mode
86
G91
Incremental mode
87
M02
Program end
88
M03
Spindle on CW
89
M04
Spindle on CCW
90
M05
Spindle stops
91
M06
Tool change
92
M08
Coolant on
93
M09
Coolant off
94
Cut per tooth = chip load
.005 equal roughing
| .001 equals finishing
95
Feed rate of milling
Inches per min
96
Cutter and shank sizing
1/8 x 3/8.
First one is cutter and last one is shank
1/2 x 5/8 x 3/8
Sizes on end is the cutter size and the middle is the shank
97
Program zero or part zero is same as
Work zero
98
In cnc program this type of code stays active for entire program unless canceled
Modal
99
In cnc program each block is read and executed by controller in block number
False
100
The following properties are desired for abrasive wheel
High hardness and low compressive strength
101
Conventional milling work piece is fed in blank direction of cutting tool
Opposite
102
Down milling requires . Blank. Force than up milling
Less
103
Drill the portion of body between margin and flute helps with. Blank.
Reducing friction
104
Silicon carbide wheels are used less as grinding wheel due to their
Low compressive strength
105
Work piece fed between two grinders
Center less grinding
106
To machine less ductile materials like cast iron generally cutting tool with positive rake angle is chosen. T or F
False
107
Calculate drilling speed you take. Blank. Of 4CS/ D
Half
108
Carbide inserts have low hardness compared to HSS cuting tools. T or F
False
109
Three jake chucks are. Blank. Accurate than collets
Less
110
Common type of tool wear that affects tool geometry is
Crater and flank wear
