Modular Fixturing

What exactly is modular fixturing? In many ways modular fixturing is just like permanent fixturing, except for a few key differences. First, modular fixtures can be assembled entirely from reusable off-the-shelf components, without machining. Next, many modular components are adjustable and universal. Finally, specially designed tooling plates and blocks, with a standard grid pattern, are the foundation of a good modular system.

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A good modular fixture system needs to accommodate a wide range of workpiece sizes. Only Carr Lane offers a full line of modular components in three system sizes (Mini, Standard & Heavy). As a comparison to choose the proper system size, the table above shows typical clamping force exerted by clamp straps in each size (2-to-1 lever ratio).

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Every multipurpose hole on a tooling plate or block has a precision alignment bushing on top, with a threaded insert below it. Multipurpose holes will accept Locating Screws, socket-head cap screws, studs, and many other threaded components. The proper mounting screw for each component is listed in its table of dimensions. Locating screws are used to locate and fasten at the same time.

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The grid pattern of multipurpose holes on every tooling plate and tooling block face is labelled with letters in one direction and numbers in the perpendicular direction. Tooling-block faces are numbered (counterclockwise) with Roman numerals. This allows recording the mounting-hole location of each component as part of permanent documentation.

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These precision bushings and threaded inserts can be used to build your own custom modular tooling plates. When used together, the bushing and threaded insert will create a standard multipurpose hole.

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Standard and heavy Rectangular Tooling Plates are accurately located on T-slotted tables using two Locating Keys in the center table slot. These plates are fastened to the machine table using four or six socket-head cap screws and T Nuts. Swivel Hoist Rings are recommended for lifting large tooling plates.

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All Rectangular Tooling Plates can be mounted as quick-change fixture plates on a subplate, as well as directly on a T-slotted machine table. Instead of the Locating Keys and Sure-Lock Fixture Keys used above for two-axis location, Subplate Locating Keys are used for three-axis location. A round key and a diamond (relieved) key are used together for precise location without binding. The subplate hole pattern shown here allows mounting any size and combination of standard or heavy Rectangular Tooling Plates, either lengthwise or widthwise.

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JIS-type mounting is the most-common way to mount tooling plates and blocks on a machining-center pallet. Here the plate or block is located from two precisely ground reference edges at 90° to each other. The plate or block is pulled against the pallet's edge locators using three socket-head cap screws and also fastened down with four to eight socket-head cap screws, depending on the size. Swivel Hoist Rings are recommended for lifting tooling blocks and large tooling plates.

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