LOCATING PINS AND HOW THEY ARE USED
This article reviews the various types of locating pins available for machine designers and offers insights into the proper application of such locating pins.Get more news about
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Typically, locating pins are used for controlled, fine tolerance positioning of a work piece. For example, a pallet that is moved along one axis, where the drive mechanism is not accurate and stable enough to place it in a position sufficiently accurate to execute a particular process, the use of locating pins may be the best solution.
Usually two locating pins are enough to properly locate the work piece on one plane.
There are dozens of styles of locating pins that can be utilized in a design. We will explain the structure and show an example of how each style can be applied.
One of the most common pins is a stepped pin with either small or large head.
Diamond Shaped Pin
The Diamond Shape is a critical feature that helps with machining inaccuracies and smoother locating operation. When two round head pins are installed onto one plate, the distance between two mounting holes must be extremely precise and even then, the work piece will not be placed on the base as easily as it would with the use of a diamond shape pin.
There are other ways of utilizing diamond locating pins. This is one example, where you need to perfectly align the center of the part, but the angular orientation is not critical.
Shank mounting styles
One of the locating pin features is a shank--the part of the pin that is installed in the mounting fixture and does not come in contact with the work piece. There are several different shank mounting configurations.
Head with Air Vent
It is beneficial to add an air vent, often in the form of a flat running along the side of pin’s head in order to avoid air compression inside the hole, especially when dealing with blind positioning holes.
Additional useful features
Most of locating pins are machined with an undercut feature that allows for the work piece to rest on the base. Sometimes more structural strength is required and you can design the pin with a radius if the positioning hole can be produced with appropriate chamfer.
