Airvent

The strength of bonded connections is comparable with that of the press-fitted, and their major advantage is that they don't cause stresses in the connecting parts. But if we don't design the mating hole with an air vent, we shall face problems during installation. Bonded connections are assembled by slide or transition fits. At bonded connections we want to maintain a glue layer around the mating surfaces. This layer is very thin so when we press the part inside the hole the trapped glue at the bottom (liquid so non compressible) forces the part back. In this case we need something strong (like a vice) to press the part back and keep it there for minimum about fifteen minutes. This could make assembly difficult especially with complicated geometries. When we provide our design with air vents the additional amount of glue flows out. The air vent could be a small groove or a filled flat.