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Program: The Installation of Bevel Gears

Checking Contact Pattern Under Load

There is another issue to keep in mind when assessing the contact pattern. When the gears are under load, the contact pattern will be different than when there is no load. The area of contact will expand on the surface of the tooth. If you need to check the pattern under load, the following method can be used.

First, obtain some layout bluing. This is material similar to a thin paint, and it is available from most industrial supply distributors.

This layout bluing can be either sprayed or brushed onto the tooth surface. After running the gears under load with lubrication, the contact pattern under load will be visible.

If you find the contact pattern is not acceptable under load, it may be required to make adjustments to the gears in the no-load condition.

Again, if you need assistance with any aspect of interpreting contact pattern, please contact Arrow Gear’s Design Engineering Department.


In this program, we have presented an overview of the key parameters required for proper installation of bevel gears. By following the procedures, your gearsets should run optimally and perform trouble free during their service life.

We hope that you have found this information on the installation of bevel gears to be helpful. If you have additional questions, please feel free to contact Arrow Gear’s Design Engineering Department at
(630) 969-7640 - extension 255.