Locator Pin in High Quality Gears
A manufacturer of high quality gears was experiencing difficulty installing a locator pin in a critical area. The pin also tended to work its way out of the assembly during use. It was vitally important that the pin was secured in the hole such that it would not fall out under extreme operating conditions.
A combination of factors contributed to the installation problem and pin walk-out such as the hole size, material hardness, surface finish within the hole, and sharp edges at the hole’s entry point.
Customer design-of-experiments and analysis indicated that there was a direct correlation between pin performance and installation force. If the force was too high, the pin or gear incurred damage. If the force was too low, the pin was at risk for walking out during the assembly life.