CD^® Coupling Selection

This will show you how to select the correct CD Coupling for your application.

If you wish, you can use the Sizing Software which will take your information and automatically suggest the correct CD Coupling.

You will need the following required information:

1. Service Factor (click here for chart)
2. Continuous and peak torque requirements or motor HP
3. Coupling RPM
4. Misalignment requirements
5. Distance between shaft ends (DBSE)
6. Physical space limitation for coupling installation and operation
7. Hub bores/type of shaft. Tapered, straight, with or without keyway.
8. Other environmental conditions
   
   
   

   Selection Procedure
   
   1- Select a coupling type (Single-Flex, Double-Flex, or Spacer) based on misalignment and/or DBSE
   
   2- Determine the required service factor, (click here for chart)
   
   3- If Continuous torque is known, then multiply it by the required service factor to get the Design Torque:
   
   
   
   5- If continuous torque is not known, but Horsepower and RPM are, calculate the Design Torque or Design HP/100 by one of the following methods: 
   

   6- Select a coupling size which has a continuous torque rating or HP/100 rating greater than the Design Torque or Design HP/100 calculated in step 3.
   
   Caution:  Motor drive systems can produce extremely high peak torques during start up or acceleration.  Be sure peak operating torques do not exceed the peak torque rating of the coupling.
   
   7- Check Coupling RPM to be sure it is within the rated speed of the selected coupling size.
   
   8- Make sure that the misalignment capability is sufficient.  As with all couplings, there is a trade-off between the parallel, angular, and axial misalignment allowed.  If 100% of the parallel misalignment rating is required, no angular and axial misalignment is allowed.  If some parallel, angular and axial misalignment is required, be certain that the combined percentage of each does not exceed 100%.
   
   It is always best to select a coupling with misalignment capabilities exceeding the initial operating conditions to allow for changing conditions over the operating life of the machine.
   
   9- Check to be sure that the coupling fits the required dimensions such as available space envelope and bore sizes. 
   
   If the coupling size and type meet the torque, misalignment, and space envelope criteria, selection is complete.

   10- Click here for ordering procedures
   
   Note:  If the standard couplings listed in the catalog do not meet your requirements, Click Here to send a note to the factory. We will work with you to meet your needs.

The service factors listed are intended only as a general guide.  For typical factors used in various applications, refer to "AGMA Standard-Lc Classification and Service Factors for Flexible Couplings"  (AGMA 514.02).