How to install and remove a spring, coiled, and slotted pin
Installation:
There are several methods that can be used to install a spring pin. Which method is best depends on the environment, be it in field repairs or large production lines.
The simplest method of installing a spring pin is to use a hammer. First, line up the pin to the hole by hand. Next, tap the end of the pin with a hammer driving it into the hole. Special care needs to be made to not damage the pin or its mating part.
Another method of installing spring pins is the use of a pin driving chuck with a press or air hammer. This method works well in small to medium production environments providing better alignment, control, and quicker cycle times. Securely attach the chuck to the air hammer or press and insert the pin into the open end of the driver leaving an exposed end of the pin. Next, insert the exposed end of the pin to the hole of the mating part and apply force from the air hammer or press until the pin has reached its desired fitment.
For large volume installations, spring pins can be installed by an automatic inserter. These automatic inserters are self-contained units with a hopper that vibrates pins into position for installation into a desired part. This process eliminates the need for manual handling of the pin. The inserter does require an operator to monitor the machine and replenishing it with pins as needed.
Removal:
Proper removal of a spring pin will depend on if the pin is in a blind hole or a through hole. A blind hole is a hole drilled to a specific depth that does not breach the other side of the work piece. A through hole is a hole that goes completely through a work piece.
To remove a spring pin from a through hole, use a properly sized roll pin punch. This will prevent damage to the pin or the mating part. Align the punch to the pin tapping the top of the punch with a hammer driving the pin out the opposite end. Continue this process until the pin as completely cleared the hole.
Removing a spring pin from a blind hole is less common. In some cases, a portion of the pin is exposed, allowing it to be gripped by a pair of pliers for simple removal. If the pin is flush to its mating surface, use of a self-tapping screw may be needed. Start by threading the screw into the center of the pin. For best results, use a screw that is smaller than the diameter of the pin to minimize expansion of the pin against the wall of the hole. Once the screw is threaded into the pin, grip the head of the screw with pliers and pull.