TPC 327 Using Index Milling Procedures

Question 1

A typical application for a dividing head is the milling of a

Chamfer
Gear
Small-radius shoulder
Tapered shaft

Answer 1

Gear

Question 2

The index holes around the spindle of the dividing head are used in ______ indexing

Compound
Direct
Simple
Spindle

Answer 2

Direct

Question 3

If a dividing head has 24 holes around its spindle nose and you must cut four equally spaced notches in a work piece, how far must you rotate the spindle between cut?

Five holes
Four holes
Seven holes
Six holes

Answer 3

Six holes

Question 4

If a dividing head has a 40: 1 gear ratio, how many times must you turn the worm to move the spindle 1/4 of a complete revolution

4
10
20
40

Answer 4

10

Question 5

How many crank turns are needed to index each of 12 equally spaced cuts on a workpiece? Use the formula: T =40/N.

2 3/4
3
3 1/3
3 2/3

Answer 5

3 1/3

Question 6

Suppose indexing a workpiece requires 4 turns of the index crank. You will use a hole circle on the index plate with how many holes?

17
18
19
20

Answer 6

20

Question 7

On a dividing head with a 40:1 gear ratio, one turn of the index crank moves the spindle how many degrees?

6
9
12
15

Answer 7

9

Question 8

For simple angular indexing on a 40:1 dividing head, you can use an index plate circle with how many holes?

23
37
54
60

Answer 8

54

Question 9

Compound indexing differs from simple indexing in that you

Disengage the worm and worm gear
Turn the crank in two different directions
Turn the index plate itself
Use two index plates

Answer 9

Turn the index plate itself

Question 10

Differential indexing is similar to, but more accurate than,_______ indexing.

Angular
Compound
Direct
Simple

Answer 10

Compound

Question 11

What makes a universal dividing head different from a plain dividing head?

It accepts all types of index plates
It can index by degrees as well as by inches
It is equipped with sector arms
Its spindle nose can be swung up 90°

Answer 11

It’s spindle nose can be swung up 90°

Question 12

When you use a center in the dividing head spindle to hold a workpiece, you install the other center in the

Chuck
Footstock
Milling machine spindle
Vertical milling attachment

Answer 12

Footstock

Question 13

When mounting work on the dividing head center, you assume a positive flow of power from the dividing head spindle to the workpiece by using a

Driver and milling machine dog
Faceplate and clamps
Faster transverse feed
Slower transverse feed

Answer 13

Driver and milling machine Dog

Question 14

When using a chuck to hold a workpiece on the dividing head, you can give the workpiece extra support with a

Driver
Milling machine dog
Spindle center
Steady rest

Answer 14

Steady rest

Question 15

If you straddle mill a hexagonal workpiece, how many times must you position the work?

One
Two
Three
Six

Answer 15

Three

Question 16

Why should you insert a cap into the opening of the dividing heads spindle?

To cut down on friction
To hold lubricant for the spindle
To hold the dividing head chuck
To keep chips out of the spindle

Answer 16

To keep chips out of the spindle

Question 17

When using the direct indexing method, you should NOT

Count the zero hole
Disengage the worm and worm gear inside the dividing head
Insert the plunger Pin in one of the holes around the spindle nose
rotate the spindle nose

Answer 17

Count the zero hole

Question 18

To use the plain indexing method, the worm and worm gearing in the dividing head must be

Disengaged
Engaged
Removed
Replaced

Answer 18

Engaged

Question 19

When plain milling, which side of a hexagonal workpiece should you mill after taking the first cut?

The adjacent side facing the column
The adjacent side away from the column
The opposite side
You must straddle me hexagonal work pieces

Answer 19

The opposite side

Question 20

The dividing head is useful for drilling holes

In a circle
And a straight line
And difficult to reach places
And work that must be held in a chuck

Answer 20

In a circle

Question 21

Cutting the teeth in a spur gear is a type of ______ milling

Angle
Form
Index
Spur

Answer 21

Form

Question 22

To mill spur gears, you should use______ cutters

Plain milling
Special profile
To half-side milling
Two single-side milling

Answer 22

Special profile

Question 23

Compute the outside diameter of a 30 – tooth spur gear blank with a diametral pitch of six. Use the following formula.

O.D.= N+2
——
DP

5.333 in.
6in.
7.333 in.
30in.

Answer 23

5.333 in.

Question 24

Which of the following factors does NOT affect cutter selection for milling spur gears?

Diametetral pitch
Gear blank material
The number of teeth
Whole tooth depth

Answer 24

Whole tooth depth

Question 25

Series of eight cutters each have been developed to cut gears with different numbers of teeth that have the same Diametral pitch Gear size Pressure angle Tooth depth

Answer 25

Diametral pitch

Question 26

To index the teeth of a large diameter gear, use a Gear tooth vernier caliper Rotary table Style B Arbor Universal dividing head

Answer 26

Rotary table

Question 27

When measuring a newly cut gear over pins, you should use a Dial indicator Gear tooth vernier caliper Micrometer Steel rule

Answer 27

Micrometer

Question 28

To check spur gear tooth thickness at the pitch circle, use a Dial indicator Gear tooth vernier caliper Micrometer Steel rule

Answer 28

Gear tooth Vernier caliper

Question 29

The distance between adjacent helices that are wound on a common cylinder is called the Helix angle Helix lead Helix pitch Pitch angle

Answer 29

Helix pitch

Question 30

The lead of a helix is determined by the Cutter used Dividing head gear ratio Dividing head lead Milling machine lead

Answer 30

Milling machine lead

Question 31

To mill a helix, you must change gears to link the lead screw of the milling machine with the Automatic transverse feed Driving head worm shaft Vertical feed Vertical milling attachment

Answer 31

Dividing head worm shaft

Question 32

If the ratio of change gearing is 1:1 and the lead of the milling machine is 10 in., a helix milling would have a lead of 1.1 in. 1 in. 10 in. 100 in.

Answer 32

10 in.

Question 33

How many change gears usually make up a set? Two Three Four Six

Answer 33

Four

Question 34

In the change gear formula 40/40×24/60, how many teeth will the two driving gears each have? 24 and 60 40 and 24 40 and 40 40 and 60

Answer 34

40 and 24

Question 35

In order to reverse the direction of gear rotation so that you can mill either a right or left-handed helix use a(n) Change gear set Idler gear Reverse gear Reverse installation chuck

Answer 35

Idler gear

Question 36

When using simple angular indexing mill 15 teeth into a cylindrical workpiece, how far apart must use space each tooth? 9° 15° 24° 36°

Answer 36

24°

Question 37

In order to obtain the proper helix angle when milling a helical workpiece, you must swivel the Dividing head spindle Footstock Machine table Vertical milling attachment

Answer 37

Machine table

Question 38

Which of the following factors is NOT important for you to know about the helical gear you are milling? Helix angle Normal diametral pitch of gear Number of teeth Where it will be used

Answer 38

Where it will be used

Question 39

When milling helical gear teeth, you should NOT draw the cutter back through the work after a cut is complete because It will cause tolerance stack up The indexing will be thrown off You could damage the gear tooth surface You could damage the cutter

Answer 39

You could damage the gear tooth surface

Question 40

The tooth dimensions of spur gears are described by circular pitch. What measurement do you use to describe helical gear teeth? Helix angle Helix lead Normal diametral pitch Working depth pitch

Answer 40

Normal diametral pitch

Question 41

What function does a cam perform? They change the direction of motion of machine parts They extend gear life They reduce the amount of energy used They smooth irregular functioning

Answer 41

They change the direction of motion of machine parts

Question 42

The follower and a nonpositive cam system would NOT be controlled by A groove in the cam A spring An external force Gravity

Answer 42

A groove in the cam

Question 43

The distance that one cam lobe moves the follower from its starting point as the cam rotates is the Cam lead Cam lobe Cam rise Uniform rise

Answer 43

Cam rise

Question 44

The total distance that a lobe on a uniform–rise cam would move the follower if the lobe extended a full 360° is the Cam lead Cam rise Lobe rise Uniform rise

Answer 44

Cam lead

Question 45

When milling a plate cam, you need a dividing head and a Dial indicator Footstock and mandrel Style B Arbor Vertical milling attachment

Answer 45

Vertical milling attachment

Question 46

When milling plate cams, the dividing head spindle and the cutter CANNOT be At any angle, other than horizontal In the horizontal plane In the same plane Parallel

Answer 46

In the horizontal plane

Question 47

When milling a uniform–rise cam with a short lead, the angle at which you set the vertical milling attachment determines the correct setting for the Cutter speed Dividing head spindle Footstock Machine table feed

Answer 47

Dividing head spindle

Question 48

On which side of the workpiece do you position the cutter when miling a short-lead cam? Left Lower Right Upper

Answer 48

Lower

Question 49

If one lobe of uniform–rise cam covers 120° of the circumference and has a rise of 0.25 in., What is the cam lead? 0.25 in. 0.50 in. 0.75 in. 1.00 in.

Answer 49

0.75in.

Question 50

When milling nonuniform–rise cams, you should use A footstock Change gearing with an idler gear Profile milling cutters The incremental-cut method

Answer 50

The incremental-cut method