54 THE DISTRIBUTOR’S LINK SPIROL INTERNATIONAL CORP. 30 Rock Avenue, Danielson, CT 06239 TEL 1-860-774-8571 FAX 1-860-774-2048 EMAIL info@spirol.com WEB www.spirol.com THE ADVANTAGES OF USING EDGE BONDED SHIMS by Christie Jones, Market Development Manager Precision Shims are used as compensators to absorb tolerances between mating components. They significantly reduce manufacturing costs by eliminating the need for each component to be precision machined in order to achieve the proper fit and function of the total assembly. During the assembly process, Shims provide adjustment to compensate for accumulated tolerances that significantly reduces the need for re-machining and assembly time. Additionally, Shims are commonly used to preserve the faces between mating components, cutting down the required machining time during rebuilds / retrofitting. Laminated Shims have peelable layers of metal that are removed until the Shim has the proper thickness. They are built up from layers of precision gauge metal foil. Layers are bonded into a rigid structure that appear and function as a solid sheet or plate. Adjusting them is as easy as peeling off laminations with a knife, or in the case of some materials, using no tool at all. Rather than having to stack a number of individual Shims, a single Shim set can be adjusted to desired thickness and slipped into position. In this way, variable close tolerances can be achieved saving considerable time required to pick various different thicknesses of loose Shims. This provides cost savings by reducing assembly time, and also minimizes line side SKU’s and related inventory storage space. The finished Laminated Shims withstand reasonable handling, including shearing and machining. In addition to being fully laminated, Laminated Shims can also be partially solid and partially laminated. This type of Shim is either half-solid or three-quarter solid, depending on the ratio of solid section to total thickness. Semi-solid Shims add rigidity to a design by meeting the performance requirements of a thicker, solid Shim as they provide a bearing surface on one side, yet allow adjustments to the overall thickness of the Shim by enabling the user to peel off unwanted layers from the other side. Surface Bonded Laminated Shims Surface Bonded Laminated Shim packs, simply referred to in the industry as "Laminated Shims", are PRECISION SHIMS OFTEN HAVE PROFILES THAT MATCH THE MATING COMPONENTS OF THE ASSEMBLY. SURFACE BONDED LAMINATED SHIMS MUST BE ADJUSTED USING A TOOL. adhered throughout the entire surface between each layer of material and the layers are pressed together to cure much like how particleboard is manufactured. The unwanted layers must be discarded due to their deformation during peeling. Edge Bonded Shims The layers of an Edge Bonded Shim set are first pressed together, and then adhered by only the edges of the Shim’s profile. This allows for a much easier separation of the layers in the field. Since Edge Bonded Shim sets are easy to peel, the layers that are not needed are preserved and can be used for a later application. TECHNICAL ARTICLE CONTINUED ON PAGE 172
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