Alb. Mod. Shafting, fits, accessories

Question 1

____ are timing devices

Answer 1

Keys

Question 2

____ should fail before anything destroys the gear train, hub or shaft.

Answer 2

Keys

Question 3

A key should fit tightly into a keyway and keyseat otherwise:

Answer 3

it rocks back and forth under load and damages the shaft and hub

Question 4

With a Pratt and Whitney key, how much of the key sits in the keyseat of the shft?

Answer 4

2/3

Question 5

What do the rounded ends help with on a Pratt and Whitney key?

Answer 5

Helps with aligning the hub and key

Question 6

What would the width of a 1014 woodruff key be?

Answer 6

5/16”

10 x 1/32

Question 7

What would the diameter of a 1014 woodruff key be?

Answer 7

1-3/4”

14 x 1/8

Question 8

A tapered gib head key should have a taper of:

Answer 8

1/8” over 12”

Question 9

when driving in a tapered gib head key, what should remain for extraction purposes?

Answer 9

a gap

Question 10

much like keys, _____ are external grooves and lands that manufacturers machine on a shaft to match with internal grooves and lands in a gear, collar, sleeve, or coupling

Answer 10

splines

Question 11

a spline allows for:

Answer 11

High torque transfer

Question 12

parts on a spline may be: (2)

Answer 12

• press fit

- free to move

Question 13

splines may have a helical curvature. What 3 functions do they serve when they do? (3)

Answer 13

• act as drivers for the component they mesh with
• allow a helical gear to slip into mesh without gear clash
• counteracts axial or end thrust

Question 14

Pillow block bearings sometimes have eccentric locking collars for locating a fixed bearing on a shaft. What direction would you turn the collar to lock it in place?

Answer 14

In the direction the shaft is going to be turning.

Question 15

a quick detachable bushing (QD) is a common tapered bushing, recognizable by:

Answer 15

an axial split through the barrel and flange

Question 16

A split taper bushing is similar to the QD bushing, however, it has an axial split through the barrel and is:

Answer 16

internally and externally keyed

Question 17

This type of taper bushing has set screws and a series of threaded and non threaded holes that need to be paired and lined up:

Answer 17

taper lock bushing

Question 18

when tightening a taper lock bushing, the threads on the holes you use will be on the ____ side

Answer 18

sprocket/outer side

Question 19

locking devices are frictional shaft-hub locking devices that use a ________ to locate and lock hubs and gears onto a shaft.

Answer 19

double tapered thrust ring

Question 20

You should not use a locking device for ______ applications.

Answer 20

cast iron hub applications

Note: this is due to the amount of press fit applied to the gear or hub

Question 21

You use this on installation assemblies for positive bearing location. The internal tab locates the washer in the keyseat of the shaft or tapered sleeve and one of the external tabs is bent over to lock the nut in position.

Answer 21

Tapered sleeves

Question 22

What are the 5 locking/positioning devices? (5)

Answer 22

• Set screws
• Tab washers
• Shear pins
• tapered dowel pins
• Retainer rings

Question 23

Set screws are also known as:

Answer 23

Grub screws

Question 24

_____ is used with tapered sleeves, where positive location is important.

Answer 24

Tab washer

Question 25

____ are used to connect gears or other parts to a shaft, and designed to disconnect the machine drive in an overload position.

Answer 25

Shear Pins

Question 26

Used when you require extremely precise location or when you frequently assemble or disassemble parts:

Answer 26

Tapered dowel pin

Question 27

Tapered dowel pins are identified by: (2)

Answer 27

- Overall length - Diameter at large end Note: these pins have a 1/4" taper per foot

Question 28

Retainer rings are also known as:

Answer 28

Snap rings

Question 29

This provides a removable shoulder to locate, retain or lock components on shafts, bores, or inside housings:

Answer 29

Retainer rings/snap rings

Question 30

These retainer rings do not require a special recess. The inclined prongs bend to position and lock the ring in place:

Answer 30

Self locking ring

Question 31

these retainer rings are available in both left and right hand winds. Slotted rings can be internal or external.

Answer 31

spiral wound rings

Question 32

The two main stresses that a shaft needs to stand up to are: (2)

Answer 32

- Bending stress | - Torsional stress

Question 33

Bending stress is a force applied by the weight of the shaft itself and the load perpendicular to the shafts axis. To keep them to a minimum:

Answer 33

keep loads close to bearings

Question 34

The most common shape for shafting is a round cross section. Other cross sections are: (3)

Answer 34

- Square - Hex - Hollow

Question 35

The purpose of line shafting is to:

Answer 35

supply power to or time a number of drives on a single shaft

Question 36

The recommended max distance between bearings on a standard line shaft is:

Answer 36

8 feet

Question 37

on a line shaft, gears, pulleys and sprockets should be as close to the _____ as possible

Answer 37

bearings

Question 38

a line shaft has fixed and floating bearings to accomodate:

Answer 38

expansion

Question 39

the fixed bearing on a line shaft should always be:

Answer 39

close to the main drive sprocket, pulley or gear

Question 40

You should use _______ bearings on horizontal line shafts

Answer 40

pillow block

Question 41

In regards to steel alloys, aluminum:

Answer 41

controls grain size and case hardens

Question 42

In regards to steel alloys, carbon:

Answer 42

Principal hardening element. Hardness increases with more carbon content, but looses ductility and weldability

Question 43

In regards to steel alloys, chromium improves steels hardenability, abrasion resistance and wear resistance, but is also added for:

Answer 43

High temp applications

Question 44

In regards to steel alloys, copper:

Answer 44

improves resistance to corrosion. Note: when added in small amounts (under 1%) the copper does not significantly affect mechanical properties of steel

Question 45

Lead does not alloy with steel. It remains in its elemental state when added, but it's added to:

Answer 45

improve machinability

Question 46

The difference between the limit of sizes is the

Answer 46

tolerance

Question 47

____ expresses the range of permissible tightness or looseness between mating parts

Answer 47

fit

Question 48

The letters "L" and "T" stand for how many 10, 000 of an inch ____ or ____ the fit is.

Answer 48

Loose or Tight Note: A clearance fit would be designated with an "L" and an interference fit would be designated with a "T"

Question 49

Clearance fit indicates that the shaft is always smaller than the bore size, or that the outside diameter of the bearing is always smaller than the:

Answer 49

housing bore

Question 50

What does AISI stand for?

Answer 50

American Iron and Steel Institute

Question 51

What does SAE stand for?

Answer 51

Society of Automotive Engineers

Question 52

What does ASTM stand for?

Answer 52

American Society for Testing and Materials