1. Function of the Vent Hole
Cam indexers feature a sealed housing filled with lubricating oil. During continuous operation, friction between internal components generates heat, causing both the lubricant and the air inside the housing to expand.
If the housing remains completely sealed, the expanding air creates positive internal pressure. As the pressure increases, it pushes lubricant through small clearances around the output shaft or flange, eventually causing oil leakage.
The vent hole equalizes the internal and external air pressure by releasing the built-up pressure inside the housing, effectively reducing the risk of oil leakage caused by excessive internal pressure.
2. Why Is the Vent Hole Sealed During Shipment?
The vent hole is sealed with a screw before shipment to protect the unit during transportation and storage.
During transportation, the indexer may be tilted, vibrated, or even inverted. An open breather could allow lubricant to leak from the housing.
The sealed vent also prevents dust, moisture, and contaminants from entering the housing, protecting the lubricant and internal components from corrosion.
Therefore:
During transportation and storage: Keep the vent sealed.
Before operation: Replace the sealing screw with the supplied vent hole.
3. Correct Installation Procedure
After installation and before commissioning, follow these steps:
1.Locate the M3 vent hole on the housing.
2.Remove the factory-installed sealing screw.
4. Benefits of Using the Vent Hole Correctly
Proper use of the vent hole provides several important benefits:
- Relieves internal housing pressure.
- Minimizes the risk of oil leakage.
- Extends oil seal service life.
- Maintains lubricant performance.
- Improves operational reliability.
- Increases the overall service life of the cam indexer.
5. Maintenance Recommendations
Inspect the vent hole regularly to ensure it remains unobstructed, and clean away any dust or oil deposits.
For long-term storage, reinstall the original sealing screw. Before restarting the equipment, open the vent hole again.
Conclusion
Although small, the vent hole is an essential component for ensuring reliable operation of a cam indexer. Keep it sealed during transportation and storage, but always install the vent hole before commissioning. Proper pressure equalization helps prevent oil leakage, protects internal components, and significantly extends the service life of the indexer.
