Power Transmission Flashcards
Calculate the accurate belt length for the following: Large diameter pulley is 11.25” and the small diameter pulley is 6.125”. Shaft centers are 17.5” apart.
(11.25 +6.125)/2 x π + (2x 17.5)
= 62.29
The clearance of meshing gears of any diametral pitch is known as:
Backlash
A Babbitt bearing percentage refers to its area of contact. This is found by:
Bluing
A bearing with a “K” it denotes a tapered bearing. This is held in place by
A tapered adapter sleeve
An 8” pulley turns at 120 RPM and drives a second pulley at 150 RPM. What is the driven pulley
diameter?
6.4
The letters A, B, C on a sprocket refers to:
Hub Class
Crowning on a pulley is used for:
Self alignment
The standard taper on an imperial key is:
1:96
A type of bearing mounted face to face and back-to-back is:
angular contact
A bearing with a code of SKF 6212 has a bore of:
60 mm
A belt is wrapped around a 6.25” pulley and has 220 degrees of contact. How much of the beltis contacting the pulley? (Use 3.14159 for pi)
11.999”
A #60 chain has a pitch of
3/4”
In a number 65 chain, the 5 refers to:
That the chain is rollerless
A drive system has two pulleys. The drive pulley is rotating at 120RPM, and the driven at 150 RPM. The driven pulley is 6.4” in diameter. What is the diameter of the drive pulley?
8”
Roller thrust anti friction bearings carry what type of load?
Axial
What do you use to check the clearance of a spherical roller bearing?
Feeler gauge
What type of coupling connects two shafts at slight angles?
U-Joint
What temperature (in Fahrenheit) is a bearing to be heated to in an oil bath, prior to installation?
248 to 250
What temperature (in Fahrenheit) is Babbitt poured at?
650 to 700
What is the best method of belt joining?
Vulcanizing
What is “creep” in a belt caused by?
elasticity
What is “creep” in a bearing?
The very slow rotation of the outer race
What principal do timing gears use?
Gear tooth
A gear tooth with a larger pressure angle is said to be:
Stronger
What are gib joint bearings suited for?
Limited side loading
High-speed bearings and roller chain use what type of lubrication?
Mist
How much oil is required to lubricate a ball bearing?
Enough to cover halfway up the bottom rolling element
What is the breaker ply of a belt?
Layer under the carcass to absorb shock
What do you use to carry “fines” on a conveyor?
Camber slide
