Assignment - Shafting, Fits & Accessories. Flashcards
Keys are a…..
- Timing Device
- Shear Point
Key clearance should not exceed _____ of an inch.
- 0.002”
Rule of thumb for key width.
- Key should be about 1/4 the diameter of the shaft
When are a Pratt & Whitney key used?
- You use these keys when the hub slides back & forth on the shaft
Define a woodruff key code 1212
- 12 = 12/32, 12 = 12/8
3/8” wide and 1 - 1/2” inches long
What is the taper of a Gib head key?
- 1/8” taper per foot.
Gib heads should never be used in this type of hub.
Cast Iron hubs, hub could crack when driving in the key.
When should we use a chamfered key and seat?
Situation with heavy shock loads.
Other than some form of key, what is another form of torque transfer?
- Splines
In what direction do you lock the eccentric collar on a pillow block?
- direction of rotation.
Why do we machine a radius or fillet on a shoulder of a shaft?
- Additional strength
The two main stresses a shaft must stand up to?
- bending stress
- torsional stress
The force applied to a shaft by resistance to turn is some times called?
- Torsional shear stress
What is the recommended maximum distance between bearings on a line shaft?
- 8 feet
How much carbon steel does a 1018 shaft have?
0.18%
