Chains - Mechanical engineering?

Question

Any info on chain + sprocket drives with regards to MechEnginee. How to calculate the correct tensions ie slack and power etc.

Answer 1

*Device widely used for the transmission of power where shafts are separated at distances greater than that for which gears are practical. In such cases, sprockets (wheels with teeth shaped to mesh with a chain) take the place of gears and drive one another by means of a chain passing over the sprocket teeth. The chains used in conveyor belts are commonly block chains, and consist of solid or laminated blocks connected by side plates and pins. The blocks engage with teeth on sprocket wheels. Depending on the material being moved, buckets, hooks, or other devices are connected to the blocks.
*Most often, the power is conveyed by a roller chain, known as the drive chain, passing over a sprocket gear, with the teeth of the gear meshing with the holes in the links of the chain. The gear is turned, and this pulls the chain putting mechanical force into the system.

Sometimes the power is output by simply rotating the chain, which can be used to lift or drag objects. In other situations, a second gear is placed and the power is recovered by attaching shafts or hubs to this gear. Though drive chains are often simple oval loops, they can also go around corners by placing more than two gears along the chain; gears that do not put power into the system or transmit it out are generally known as idler-wheels. By varying the diameter of the input and output gears with respect to each other, the gear ratio can be altered, so that, for example, the pedals of a bicycle can spin all the way around more than once for every rotation of the gear that drives the wheels.
*
horsepower transmitted by chains:

H.P.=[T1*v]/4500,where

v=average chain velocity in meters/second
T1=tension on the tight side
Tension on the slack side is zero.
v=p*P*n/100 meters/second.
where,
p=pitch of the chain in cm.
n=no. of teeth on the sprocket
N=RPM OF THE SPROCKET.

Velocity ratio
=n1/n2=N2/N1

L=2 C+[N+n]/2+ [N-n]^2/[4*(3.14)^2*C]
Where:
L =Chain length, pitches
C = Shaft centers, pitches
N = Number of teeth in large sprocket
n = Number of teeth in small sprocket

Answer 2

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Answer 3

Link Belt has a complete information manual on chain drives. It gives all the information you are requesting. And the manual is free to engineers.

Answer 4

tight enough to not fall off but still get a good grip on the sprocket

Answer 5

See the following web sites:

http://www.maintenanceresources.com/ReferenceLibrary/RollerChainDrives/installationpg1.htm

http://www.machinedesign.com/BDE/mechanical/bdemech2/bdemech2_2.html

http://www.answers.com/topic/chain-drive
(be sure to scroll all the way thru this one)