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6th 6 Months > 327 > Flashcards

327 Flashcards

1
Q

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

A

Gear

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2
Q

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

A

Direct

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3
Q

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

A

Six holes

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4
Q

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?

A

10

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5
Q

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

A

3^1/_3

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6
Q

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?

A

20

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7
Q

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

A

9

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8
Q

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

A

54

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9
Q

Compound indexing differs from simple indexing in that you

A

Turn the index plate itself

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10
Q

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

A

Compound

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11
Q

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

A

Its spindle nose can be swung up 90°

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12
Q

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

A

Footstock

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13
Q

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

A

Driver and milling machine dog

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14
Q

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

A

Steady rest

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15
Q

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

A

Three

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16
Q

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

A

To keep chips out of the spindle

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17
Q

When using the direct indexing method, you should NOT

A

Count the zero hole

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18
Q

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

A

Engaged

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19
Q

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

A

The opposite side

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20
Q

The dividing head is useful for drilling holes

A

In a circle

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21
Q

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

A

Form

22
Q

To mill spur gears, you should use ____ cutters

A

Special profile

23
Q

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

A

5.333 in.

24
Q

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

A

Whole tooth depth

25
Q

Series of eight cutters each have been developed to cut gears with different numbers of teeth that have the same

A

Diametral pitch

26
Q

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

A

Rotary table

27
Q

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

A

Micrometer

28
Q

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

A

Gear tooth vernier caliper

29
Q

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

A

Helix pitch

30
Q

The lead of a helix is determined by the

A

Milling machine lead

31
Q

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

A

Dividing head worm shaft

32
Q

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

A

10 in.

33
Q

How many change gears usually make up a set?

A

4

34
Q

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

A

40 and 24

35
Q

In order to reverse the direction of gear rotation so that you can mill either a right- or left-hand helix, use a(n)

A

Idler gear

36
Q

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

A

24°

37
Q

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

A

Machine table

38
Q

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

A

Where it will be used

39
Q

When milling helical gear teeth, you should NOT draw the cutter back through the work after a cut is complete because

A

You could damage the gear tooth surface

40
Q

The tooth dimensions of spur gears are described by circular pitch. What measurement do you use to describe helical gear teeth?

A

Normal diametral pitch

41
Q

What function does a cam perform?

A

They change the direction of motion of machine parts

42
Q

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

A

A groove in the cam

43
Q

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

A

Cam rise

44
Q

The total distance that a lobe on a uniform-rise cam would move the follower if the lobe extended a full 360° is the

A

Cam lead

45
Q

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

A

Vertical milling attachment

46
Q

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

A

In the horizontal plane

47
Q

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

A

• Dividing head spindle

48
Q

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

A

Lower

49
Q

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?

A

0.75 in.

50
Q

When milling nonuniform-rise cams, you should use

A

The incremental-cut methodl

6th 6 Months (8 decks)

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