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School > Shafts And Attachments > Flashcards

Shafts And Attachments Flashcards

1
Q

The term “FIT” can be defined as what?

A

The range of permissible tightness or looseness between two mating parts.

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2
Q

What are Kennedy Keys?

A

A pair of tapered keys installed 90 degrees apart from eachother on a shaft.

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3
Q

What is the standard taper for a key in inches?

A
  • 1/96”
  • Sometimes expressed as 1/8” in 12”
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4
Q

With a hollow shaft, a 25% reduction in weight reduces strength by how much?

A

6.25%

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5
Q

A key is a timing device that is designed to be what on a shaft?

A

The weakest part of a machine.

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6
Q

What is a Class 1 fit for a key on a shaft?

A
  • A clearance fit, where there is a relatively free fit for the key to slide in the key seat.
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7
Q

What is a Class 2 fit for keys on a shaft?

A

Class 2 is a relatively tight fit, with a possible slight interference with the key seat.

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8
Q

What is a Class 3 fit for a key on a shaft?

A

Class 3 is a interference fit for permanent assemblies.

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9
Q

Most couplers are positively located on a rotating shaft by means of what?

A

Keys

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10
Q

Tolerence is defined as what?

A

The total permissble variation a given piece can be both over and undersized.

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11
Q

Which is more common, straight keys or taper keys?

A

Straight

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12
Q

What type of key is this?

What is the round part designed for?

A
  • Woodruff Key
  • The circular shape permits the key to allgin itself to suit either a parallel or a tapered shaft. The design minimizes any tendency of the key to tip when load is applied.
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13
Q

What is the taper ratio for a metric taper key?

A

1/100

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14
Q

Are set screws required with taper keys?

A

No

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15
Q

What is the carbon content of steel AISI 4340?

A
  • 0.40%
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16
Q

What is a Dutchman?

A

A spacer for between a key and Drift Key when removing the key.

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17
Q

The Coefficient of Linear Expansion for Steel is what?

A

0.0000063” per inch per degree of F

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18
Q

Is Bar Stock made to oversized tolerence?

A

No

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19
Q

C type hubs have how many bosses?

A

Two Bosses

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20
Q

What is a Saddle Key?

A

An emergency key.

21
Q

Lead improves what in steel?

A

Machinability

22
Q

Is Key Stock made to an oversized tolerence?

A

Yes

23
Q

Ferrous metal keys are made from what?

A

Cold worked steel.

24
Q

Rectangular Key is also refered to as what?

A

Flat Key

25
Q

What key should you not use with Cast Iron?

A

Taper Key. The Cast Iron could crack due to pressure.

26
Q

A key identified as 1212 is what?

A
  • Half-moonshape with a diameter of 1.5”
  • Related to Woodruff Keys
27
Q

What is the maximum allowance for fitted keys in unidirectional, low torque applications?

A

0.002” on the sides and 0.005” on the top.

28
Q

What is the rule of thumb for sizing the width of a key for a given shaft?

A
  • 1/4” per inch of shaft diameter.
29
Q

What is a Gib-headed Key?

A

A rectangular key with an enlarged head on one end to facilitate quick extraction for frequent removal.

30
Q

Which Key is secured with screws in the key?

A

Fixed Feather Keys

31
Q

True or False: All shafting is usually manufactured in standard dimensions.

A

True

32
Q

What is a Pratt-Whitney Key

A

A rounded end, drop in key.

33
Q

When relative motion in the axial direction is required what key is best?

A

Feather Key

34
Q

What are Keys typically made of?

A

Steel AISI 1020 in cold drawn condition

35
Q

What are Offset Keys?

A

Keys with steps in them. They facilitate quick removal.

36
Q

Name two types of Boxed Keys.

A
  • Pratt and Whitney Key
  • Buried Key
37
Q

What are the two types of Feather Keys?

A

Fixed and Sliding

38
Q

What is so special about Feather Keys?

A

They permit end movment for two parts either in operation or during assembly.

39
Q

How are Woodruff Keys sized?

A

They are given in standardized sizes designated by a code.

The last two digits give the Nominal diameter in eighths of an inch.

The first digit(s) before the last two give the Width of the key in thirty-secondths of an inch.

40
Q

Can you make Woodruff Keys from round stock?

A

Yes, in emergencies.

41
Q

What is a Boxed Keyseat?

A
  • A channel cut into the shaft for a Key to sit in.
  • Not to be mixed up with an Open Keyseat which are cut at the end of a shaft.
42
Q

Describe a Sled-Runner Keyseat.

A
43
Q

Describe a Profile Keyseat.

A
44
Q

Do Woodruff Keyseats need setscrews?

A

No, the the shape of the channel will hold the key in place.

45
Q

What do you use to cut Keyseats in an attachment?

A

Milling Machines or manually: Broach and Arbor press

46
Q

What insures positive contact between Keys and shafts?

A

Set Screws

47
Q

What are Fox Wedges?

A

Wedges which are used to remove Gib-headed Keys.

48
Q

Answer

A

D)

49
Q

Answer

A

C)

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