Quiz Stuff

Question 1

M144 is live tooling mode
M145 Is lathe mode

But not all machines use this. Always check manual

Answer 1

True

Question 2

For live tooling
M133 = CW
M134 = CCW
P = rpm

Answer 2

True

Question 3

Incremental is better than absolute when trying to indexing WP on C axis

Answer 3

True

Question 4

Y axis zero return position is spindle centerline on a lathe

Answer 4

True

Question 5

X axis coordinate are still specified in diameter when using polar coordinate interpolation

Answer 5

True

Question 6

Definition of a vector

Answer 6

Quantity having magnitude and direction

Question 7

Word command that is commonly ised to program geometry offset entries on a lathe

Answer 7

G10

Question 8

Most machine tool builders recommend lower spindle range for cutting thread

Answer 8

True

Question 9

Taper amount value
External threads = negative value
Internal thread = positive value

Answer 9

True

Question 10

If your lathe doesnt have live tooling, it probably doesnt have a canned cycle for tapping.

Answer 10

True. But you can still use g01

Question 11

Causes for machined thread pitch to come out wrong

Answer 11

Exceed machines max feed rate. Insufficient approach or escape where the spindle cant spin as fast as feed movement

Question 12

G code for TNRC

Answer 12

G40 - cancel
G41 - instate in LH
G42- instate in RH

Question 13

2 values that you must enter into the offset register when using TNRC

Answer 13

R value on R register

Tool type in T register

T2 for boring bar
T3 for turning tool

Question 14

For g71, finish pass definition ends at the xommand that brings the cutting tool back to the convinent cutting position in the x

Answer 14

True

Question 15

When rough boring, the U word is negative instead of positive

Answer 15

True

Question 16

G73 can completely rough machine castings and forging regardless of shape

Answer 16

False,you can only use it if the casting matches the shape of the workpiece

Question 17

G74 only works for chip breaking peck drilling, NOT deep hole peck drilling

Answer 17

True

Question 18

G codes for single pass canned cycle

Answer 18

G90- turning/boring
G91- taper turning
G92- threading
G93- nothing
G94- facing

Question 19

G code for feed modes

Answer 19

G95- feed per revolution
G96 - constant surface speed (best for turning/boring
G97- rpm mode (tapping/drilling)
G98- fpm
G99- fpr

Question 20

Block delete provides a way to give the operator or set up persons a choice between one of 2 possiblities

Answer 20

True

Question 21

What is g02 and g03

Answer 21

G02 - CW circular interpolation
G03- CCW

Question 22

Easiest way to specify arc size in a circular interpolation command is

Answer 22

R word

Question 23

Which pressure gear angle allows for fewest # of teeh

Answer 23

25deg

Question 24

Which pressure angle provides most efficient transfer of power

Answer 24

14.5

Question 25

Worm gears and hypoid bevel gears are both non parallel and non intersecting

Answer 25

True

Question 26

What is the shape on a tooth of a worm, not the gear

Answer 26

Straight sided

Question 27

How is the pitch of a coarse pitch worm thread expressed

Answer 27

In DP

Question 28

What is the speed ratios beteren a 2 starr orm and a 60 tooth worm gear

Answer 28

30:1 not 60:2. Always one

Question 29

What is the table lead screw geared to in a short lead helical milling set up

Answer 29

Spindle of the dividing head

Question 30

For tooth thickness on worms, it is

Answer 30

Divide the LP by 2 Or pi/DP then divide by 2

Question 31

For worm identification its always P first for imperial and L first on metric

Answer 31

Eg 2.0.25P-0.75L UN 2a for imperial M25x 6L -2P 4h6h for metric

Question 32

When solving for DP on a gear with helix angle

Answer 32

DP= NDPx cos (helix angle) NSP is same as DP, just need to multiply cos(30)

Question 33

The purpose of a rack milling attachment is to

Answer 33

Orient the cutter with the rack

Question 34

Triangles naturally form 2 groups, these 2 groups are

Answer 34

Right triangles and non right triangles

Question 35

Taper amount value when cutting threads

Answer 35

Negative for external Positive for internal

Question 36

How is the pitch of a coarse worm thread expressed

Answer 36

In DP

Question 37

Which 2 types of bevel gears require anti friction bearings?

Answer 37

Spiral and hypoid

Question 38

3 safety commands you put in the beginning of a program

Answer 38

G99 - per revolution feedrate mode G20- imperial mode G23- cancel stored stroke limit

Question 39

3 types of threads for worms and uses

Answer 39

Fine pitch - light duty, accurate, 20deg angle. Expressed in axial pitch Coarse- heavy duty industrial, most torque and strong, 20 sometimes 25deg. Expressed in DP Browne and sharpe - obsolete, like acme, only on older machinery

Question 40

On a worm, rule of thumb, number of starts is chosen to provide a lead angle of 25 to 45deg. More starts, higher lead angle

Answer 40

True

Question 41

Hunting tooth on a worm is so the thread on a worm finds a different tooth on a gear each time. Shouldn't be exact multiple to # of teeth on worm to gear

Answer 41

True

Question 42

For cnc sub programming what is m98 and m99

Answer 42

M98- calls up sub programming M99- ends sub program and goes back to main