327

Question 1

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

Answer 1

Gear

Question 2

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

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 workpiece, how far must you rotate the spindle

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 one quarter of a complete revolution?

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.

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?

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?

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?

Answer 8

54

Question 9

Compound indexing differs from simple indexing in that you

Answer 9

Turn the index plate itself

Question 10

Differential indexing is similar to, but more accurate than, _____ indexing

Answer 10

Compound

Question 11

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

Answer 11

Its 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

Answer 12

Footstock

Question 13

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

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

Answer 14

Steady rest

Question 15

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

Answer 15

Three

Question 16

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

Answer 16

To keep chips out of the spindle

Question 17

When using the direct indexing method, you should NOT

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

Answer 18

Engaged

Question 19

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

Answer 19

The opposite side

Question 20

The dividing head is useful for drilling holes

Answer 20

In a circle

Question 21

Cutting the teeth in a spur gear is a type of
_____ milling.

Answer 21

Form

Question 22

To mill spur gears, you should use ____ cutters

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

Answer 23

5.333 in.

Question 24

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

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

Answer 25

Diametral pitch

Question 26

To index the teeth of a large-diameter gear, use a

Answer 26

Rotary table

Question 27

When measuring a newly cut gear over pins, you should use a

Answer 27

Micrometer

Question 28

To check spur gear tooth thickness at the pitch circle, use a

Answer 28

Gear tooth vernier caliper

Question 29

The distance between adjacent helices that are wound on a common cylinder is called the

Answer 29

Helix pitch

Question 30

The lead of a helix is determined by the

Answer 30

Milling machine lead

Question 31

To mill a helix, you must use change gears to link the lead screw of the milling machine with the

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

Answer 32

10 in.

Question 33

How many change gears usually make up a set?

Answer 33

4

Question 34

In the change gear formula ^ 40/_40 x ^24/_60, how many teeth will the two driving gears each have?

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-hand helix, use a(n)

Answer 35

Idler gear

Question 36

When using simple angular indexing to mill 15 teeth into a cylindrical workpiece, how far aprt must you space each tooth?

Answer 36

24°

Question 37

In order to obtain the proper helix angle when milling a helical workpiece, you must swivel the

Answer 37

Machine table

Question 38

Which of the following factors is NOT important for you to know about a helical gear you are milling?

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

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?

Answer 40

Normal diametral pitch

Question 41

What function does a cam perform?

Answer 41

They change the direction of motion of machine parts

Question 42

The follower in a nonpositive cam system would NOT be controlled by

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

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

Answer 44

Cam lead

Question 45

When milling a plate cam, you need a dividing head and a

Answer 45

Vertical milling attachment

Question 46

When milling plate cams, the dividing head spindle and the cutter CANNOT be

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

Answer 47

• Dividing head spindle

Question 48

On which side of the workpiece do you position the cutter when milling a short-lead cam?

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?

Answer 49

0.75 in.

Question 50

When milling nonuniform-rise cams, you should use

Answer 50

The incremental-cut methodl