ALTERATIONS
ALTERATIONS
The term “alteration” applies to a modification/change in configuration from standard for a stock sprocket. All U.S. Tsubaki sprockets can be “Altered” to meet select application requirements. The following provides a list of common alterations performed by U.S. Tsubaki to stock sprockets, and an explanation of what each is. In the event that the modification requested is not listed, it does not mean that the sprocket cannot be altered. However, it may mean that the alteration in question would require the sprocket be Made-To-Order (MTO) to meet the application requirements at hand. Please consult a U.S. Tsubaki Customer Service Representative to review additional options available for altered and MTO sprockets.
Sprocket Hub Mounting Holes
U.S. Tsubaki stock sprockets do not come with bolt mounting holes with the exception of Taper-Lock ® and QD ® hubs. In select instances, bolt mounting holes may be required in order to facilitate attachment of custom hubs, or accessory pieces that may be required to fulfill the needs of the application at hand. Sprocket bolt mounting holes typically apply to “A” plate sprocket types, where the holes required are located around the circumference of the plate bore. However, select “B” style sprockets may also require mounting holes. Please reference Figure 3 for a depiction of an “A” plate sprocket with mounting holes installed.
Sprocket Reboring
Reboring is a process of changing the dimension or configuration of the sprocket inner hub diameter to meet the application requirements at hand. Typical reboring alterations include: • Hub inside diameter dimension not listed as standard • Hub inside diameter dimension greater than standard • Hub inside diameter dimension smaller than standard • Metric inside hub diameter dimension • Hexagon broached inside diameter hub configuration • Splined broached inside diameter hub configuration • Change to Length Through Bore (LTB) dimension Please reference Figure 1 for an illustration of a typical finished bore sprocket.
Figure 3 - “ A ” plate sprocket with mounting holes
Sprocket Lightening Holes
There may be instances where reducing the weight of a given sprocket would be advantageous for the application. This is more common for applications that utilize large pitch sprockets. U.S. Tsubaki offers the option to incorporate lightening holes into sprockets at an additional charge. Please reference Figure 4 for a depiction of an “A” plate sprocket with lightening holes.
LTB
Figure 1 - Typical finished bore sprocket
Sprocket Keyway & Set Screw
Sprocket Hub Outside Diameter
U.S. Tsubaki standard keyway configuration facilitates use of industry standard square key stock in inch sizes with use of common set screws. The standard keyway location is center line of tooth +/- 0.015". Two set screws are furnished with finished bore sprockets. One set screw is placed directly over the keyway. The second set screw is placed at 90 degrees from the keyway set screw. Application requirements may demand a different keyway and set screw configuration than standard. Common alterations to standard keyway / set screw configurations include: • Keyway non center line of tooth • Tapered keyway • Multiple keyways • Metric keyway • Metric set screws • Set screw location other than standard Please see Figure 2 for standard keyway locations.
Figure 4 - “ A ” plate sprocket with lightening holes
Select applications may call for the sprocket hub diameter to be reduced in size or increased for various reasons. U.S. Tsubaki offers the option to reduce the outside diameter of a given hub by removing material. Please reference Figure 5 for a depiction of a “B” style sprocket with a smaller hub diameter versus standard. Larger diameter hubs may be more difficult to accommodate but please contact U.S. Tsubaki if needed.
Tapered Hub Bore/Tapered Keyway
U.S. Tsubaki offers the option to taper the inside bore diameter or keyway for all “B” style stock sprockets. Please reference Figure 6 for a depiction of a tapered bore “B” style sprocket.
Figure 2 - Standard Keyway and set screw location
Figure 5 - Reduced hub diameter
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