Indexing FAQ’s

What is indexing?

Whether linear or rotary, Indexing is the process of starting and stopping a device in precise intervals at precise locations.

How do servo indexers work?

Unlike mechanical indexers which typically employ cams to position a load, servo indexers utilize servo motor technology to drive and position the load. Although cams can be made very precise, the positional accuracy of a mechanical indexer is only as good as the machining accuracy of its components.

Because servo indexers can have closed loop position feedback, their accuracy is for the most part not affected by machining and assembly tolerances. This can provide higher accuracy and repeatability. And because position feedback is employed, the degradation associated with component wear becomes negligible-resulting in years of reliable performance without the loss of system accuracy.

How do I control a Centricity indexer?

The standard method of initiating an index is via a 24 volt DC signal (usually from a PLC or palm buttons) at a terminal on the indexer’s controller. Once the signal is applied, the indexer will move one index. When the move is complete a corresponding 24 volt DC signal is output to one of the controller’s terminals. This output is commonly utilized by the customer to verify the move has been made.

In addition a stop move input terminal is provided so that the move can be halted at any time.

What are the advantages of a Centricity indexer vs. a mechanical indexer?
  • Less component content than mechanical indexers. Rotary motion profiles are accomplished electronically instead of through the use of cams and follower bearings.
  • Lower overall costs when you consider the true finished cost of an installed unit. For example, wiring and drive mounting, torque overload protection. PLC interfacing, filling the unit with oil.
  • Servo indexers can position more accurately than a mechanical indexer.
  • Unlike mechanical indexers, the number of stops (stations) and other parameters can easily be changed.
  • Higher accuracy and repeatability can be obtained with a Centricity indexer.
  • Large through-holes are available.
  • Centricity indexers are supplied completely assembled, wired, and tested. Just bolt on your dial plate, connect power and you’re ready to go.
  • Interfacing a Centricity indexer with other controls is simple and straightforward.
  • The dial plate can be provided, completely machined, at a reasonable price.
  • Since Centricity indexers are programmable, they can be used for many different jobs. If one project is cancelled the indexer can be reconfigured for the next job.
  • You can talk directly with a Centricity engineer if you have questions or need help with your application or startup.
  • Many specialized configurations and options are available such as:
    • Vacuum zoned dial plate
    • Explosion proof versions
    • Center-mounted rotary unions for gas or liquid passage
    • Slip rings for electrical power to the dial plate
    • All pneumatic or hydraulic drive
    • Electrically isolated dial plates
    • Large diameter tables with huge load capacities
    • Reciprocating models
How do I choose a Centricity indexer?
  • Select the QUOTE REQUEST side bar on our website.
  • If you’re not sure of your needs click on the Accuring logo and fill out the AccuRing™ Rotary Table Request for Quotation.
  • Or call Bob Miles in Technical Sales at 330-545-5624.

In either case you will be contacted by a technical sales person to review your application and provide pricing.

Can I discuss my application with a Centricity technical specialist?

Yes. Call Bob Miles in sales at 330-545-5624 and Bob will direct the call to the appropriate personnel.