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6th sixth > 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 use 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 between cut

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?

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 ratio one turn of the index crank move 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 then ___ 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 90 degrees

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12
Q

when you use a center on 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

A

5.333

24
Q

which of the following factors does not affect cutter selection for milling spur gears

A

whole tooth depth

25
Q

series of eight cutters each have been developed to cut gears with different numbers of teeth

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 10in a helix milling would have a lead of

A

10in

33
Q

how many change gears usually make up a set

A

four

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 a gear rotation so that you can mill either a right or left hand helix use an

A

idler gear

36
Q

when using simple angular indexing to mill 15 teeth into a cylindrical workpiece how far apart must you space each tooth

A

24 degrees

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

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 teeth gear

A

normal diameter 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 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 ruse 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 degrees of the circumference and has a rise of.25in what is the cam lead

A

.75in

50
Q

when milling nonuniform rise cams you should use

A

the incremental cut method

6th sixth (9 decks)

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