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Copyright 2006-2008
The Old Fashion
Robotic Store, Inc.
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Sprockets and Chains
Chains and sprockets are parts of a drive train that transfers and converts power from the source to where it is needed through a chain instead of a shaft or direct connection.
These parts can be used in place of a low conversion gearbox. By using different sprockets you can convert for speed or power. The ratio of the drive sprocket (source of power) to the driven sprocket (where power needs to go) times the RPM of the power source (at the drive sprocket) will give you the speed increase/reduction that is required at the end point.
Example: using a 12 tooth drive sprocket ( directly attached to a 300RPM motor) and a 30 tooth driven sprocket will give you an output speed of 120RPMs.
Speed:
(drive teeth/driven teeth) * at drive RPMs = Output RPMs
( 12teeth / 30teeth ) * 300RPMs = 120RPMs
Torque:
(driven teeth/drive teeth) * at drive force = approximate Output force
( 30teeth / 12 teeth ) * 30in-oz = approx 75in-oz
Note: There is some loss of force from the chain and sprockets, so the torque is only an approximation
Things to consider when using sprockets:
Pitch – This is the distance from the center of one link of chain to the next. The bigger the pitch and harder the material, the more load that can be carried or moved.
Ratio of the drive to driven sprockets
Bore of the shafts that the sprockets reside on. Also whether there is a hub, and if it is fastened to the shaft by friction or set screw.
Sag and tension of the chain and eventual stretching of the chain
Master links can be snap, clipped, or crimped styles
Load and speed on chain movement can be a cause for failure
Lubrication and maintenance
Dirt
Safety covers to protect from accidental grabbing of hands, clothes, and hair
Types of chains to consider:
Very fine chains, .1227 or 98 links per foot can have a load of up to 2lbs. Good for small projects.
Small chains, like bicycle chains, 0.500 pitch, 3/32” widths are common place and can carry a larger load. These chains and their corresponding sprockets can be found at a local bicycle store, along with the tools needed to fit that chain to the project.
Larger chains, like a motorcycle chain, starting at 0.500” pitch and up, can handle much more of a load for bigger projects over 50lbs. Motorcycle shops like Razee Motorcycle Center, Inc. in North Kingston keep a mixture of chains and sprockets that are readily available.
We carry two sprocket sets and individual sprockets for the very fine .1227 pitch.
DE001 is a set that contains 1/4”
DE002 is a set that contains 3/8”
Individual .1227 plastic (no corrosive) sprockets we carry:
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