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Locating Pins Guide

Started by upamfva, 2022/12/29 01:27AM
Latest post: 2022/12/29 01:27AM, Views: 115, Posts: 1
Locating Pins Guide
#1   2022/12/29 01:27AM
upamfva
Locating Pins Guide


These locating pins come in a wide range of diameters. They are (normally) installed by either press fitting the pin directly into the tool body, or slipping them into a bushing. This second type is retained by a lockscrew.Get more news about naams locating pin,you can vist our website!

Round Locating Pins

Round pins can be used for both internal and external workpiece location. For internal location, the diameter of the pin must match the size of the locating hole. These locators come in many standard sizes, and are readily available ground to special diameters. For external location, the size of the locating pin is not as critical. Here, a standard pin size strong enough to resist machining forces is the best choice.

Plain locating pins are pressed directly into the tool body. They are normally used for workholders in short-to-medium production runs where there is no need for pin replacement. Plain locating pins provide the necessary horizontal location, in the x and y axes, for the workpiece. The vertical location and support, in the z axis, are provided by other supports.

The shoulder-type pins likewise locate the workpiece in the horizontal, x and y, axes. These pins have a shank larger than the head. The purpose of the shoulder is to prevent the pin from being pushed into the tooling plate too far. Unlike the plain pins, shoulder-type pins are made in two styles: press-fit type and lockscrew type, Figure 7-3. The press-fit type is pressed into the tool body in the same way as a plain-type locating pin. The lockscrew type, however, should be installed with a locating-pin liner bushing.
This liner is pressed into the tool body and affords the locating pins a hardened, wear-resistant mounting hole. The machined recess on the shoulder is for a lockscrew that holds the locating pin in position, Figure 7-4. The liner is primarily intended for workholders in long production runs or for applications where heavy wear is a concern. Locating pin liners permit the easy and accurate replacement of the locating pins as they wear, without damaging the mounting holes, or having to remove the fixture plate from the machine tool.

In addition to the round locating pins previously mentioned, other variations are available, including bullet-nose dowels, bullet-nose pins, and cone locator pins, Figure 7-5. These end shapes are mainly for internal location and allow easier loading of workpieces over the pins. Each of the locators is installed by press fitting into the tool body.

The most common application for these locating pins is the alignment of workholder elements, rather than locating workpieces. A sandwich jig, for example, is made with two individual plates. Two locating pins ensure the alignment of the top plate to the bottom plate when the jig is assembled. In these cases, the locating pins are aligned with locating bushings, Figure 7-6. These hardened bushings help maintain locational accuracy throughout the life of the workholder.

Bullet-nose round pins are ideal for aligning two pieces of a workholder. The pin’s shank diameter and the locating bushing’s outside diameter are the same size to allow boring the installation holes in both pieces at the same time, for greater accuracy.


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