Module - Shafting, Fits & Accessories. Flashcards Preview

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Flashcards in Module - Shafting, Fits & Accessories. Deck (18):
1


__________ are designed to be the weak link in the mechanism.


Keys are designed to be the weak link in the mechanism.

2


What is the recommended width of key relative to the shaft diameter?


The recommended width of a square or flat key is approximately 1/4 the diameter of the shaft.

3


A #608 Woodruff key is __________ wide and __________ in diameter.


A #608 Woodruff key is 3/16" wide and 1" in diameter.

4


How is a gib head key removed from a hub?


A gib head key can be taken out by driving a wedge between the gib and the face of the hub.

5


To secure a pillow block bearing on a shaft, which way do you rotate the eccentric locking collar before locking it?


You rotate the eccentric locking collar in the direction of shaft rotation.

6


What is the purpose of a floating bearing on a line shaft?


The purpose of a floating bearing is to keep the shaft aligned while allowing for shaft expansion.

7


Where should the fixed bearing on a line shaft be located?


The fixed bearing should be located next to the main drive.

8


Do split locking collars locate a shaft in a coupling radially or axially?


axially

9


Taper pins have a/an __________ inch taper per foot.


Taper pins have a 1/4-inch taper per foot.

10


What are the two main stresses to which shafts are subjected?


torsional stress
bending stress.

11


How could bending stresses on shafting be kept to a minimum?


Keep the loads close to the bearings.

12


What is the principal hardening element in steel?


carbon

13


Lead improves the _______________________ of a steel.


Lead improves the machinability of a steel.

14


What does AISI stand for?


the American Iron and Steel Institute

15



What does SAE stand for?


the Society of Automotive Engineers

16


What is the carbon content of the steel AISI 4340?


The carbon content in AISI 4340 is 0.40%.

17


What is the tolerance of a shaft with a permitted size variation from 6.125 inches to 6.129 inches?


The tolerance is 0.004 inch.

18


If a 4-inch shaft has a tolerance of ± 0.004 inches and the mating hub has a bore of 3.995 inches with a tolerance of 0.000 inches to 0.004inches, what is the type of fit?


It is an interference fit.