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| NRG sprockets are custom fabricated for use with its precision molded non-metallic collector chains. The following information provides a brief overview of NRG sprockets for H78 as well as 720 chains. For more information or for clarification, please feel free to call customer service or our local sales representative. | ||||||||||||||||||||||||||||||||||||||||||||
| Standard Sprocket Features | ||||||||||||||||||||||||||||||||||||||||||||
| Split Hubs | ||||||||||||||||||||||||||||||||||||||||||||
| NRG
sprockets are supplied with split hubs as STANDARD. The split hub
design allows a sprocket to be assembled onto or removed from shafts
without removing the shaft from the wall. It also allows the sprocket
to be removed without removing adjacent items such as bearings, set
collars, or static shaft bushings. Additionally, split sprockets can be reversed, allowing for use of the unworn sides of the sprocket teeth. This alone doubles the life of the sprocket. NRG sprockets are also available in various types. Most NRG sprockets, however, are supplied as type "C". These hubs are symmetrically shaped with the hub extending an equal distance from the sprocket wheel on each side. NRG sprockets are also available in "C" offset (sprocket wheel extends from hub slightly off-center), "B" type (hub only extends on one side), and "A" type (no hub at all - sprocket attached to alternate hub or device via holes on sprocket wheel). NRG sprockets are, of course, available in solid hub design as an option. |
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| Hunting Tooth | ||||||||||||||||||||||||||||||||||||||||||||
| NRG
720 sprockets are supplied in hunting tooth design as STANDARD. These
hunting tooth sprockets have an odd number of teeth and are spaced
at half of the chain pitch. With this arrangement, there are essentially
two independent sets of sprocket teeth. Every time the sprocket makes
a revolution, the chain links engage a new set of teeth. Each tooth
makes contact with the chain only half as many times as it would on
a regular sprocket, thus doubling the life of the sprocket. With their standard split, hunting tooth design, NRG 720 sprockets will last FOUR TIMES as long as solid non-hunting tooth sprockets. * Because of the smaller pitch size, NRG NH78 sprockets are not available in hunting tooth style. |
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| Key Seats and Set Screws | ||||||||||||||||||||||||||||||||||||||||||||
| NRG
sprockets can be supplied in three basic fashions: 1. Key way & Set Screws 2. Set Screws Only 3. Plain Bore NRG provides key way and set screw sprockets on rectangular collector head shafts and other driving shafts as STANDARD. This prevents slippage at the drive or driven part of the mechanism. Set screw only sprockets are generally provided to maintain flight alignment at the idler shafts in dynamic shaft system collectors. One set screw sprocket in tandem with one plain bore sprocket per shaft is recommended. Other designs, of course, are available. Set screws are offset 180° unless otherwise specified. Plain bore sprockets are provided for idler shafts as detailed above or for static shaft systems. NRG key ways are sized per the following chart unless otherwise specified. NRG can provide key seats and/or set screws in a variety of quantities and locations. Please contact NRG for your specific needs. |
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