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Custom Applications Utilizing Granite

Volume 2, No. 4

Fall, 2008

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Quality, Precision, Innovation

Granite is the material of choice for machine bases and metrology components for a variety of reasons. It is rustproof, easy-to-clean, machinable and provides ultimate flatness. The Tru-Stone Division of Starrett combines the natural benefits of granite with the industry’s most in-depth knowledge and techniques to provide a custom product that is perfect for your application.

The quality of the final product directly relates to our integration of high quality parts, proven methods and skilled workmanship. This article is a quick overview of several of the most common components and techniques that Tru-Stone utilizes to engineer custom applications.

Inserts
Inserts might seem as simple as stationary nuts, but they play a crucial role for proper assembly of your stage, rails, clamps, etc. to the granite base. If even one insert pulls loose or has poor threads, your entire assembly is compromised.

Tru-Stone uses 300-series certified stainless steel inserts so you don’t have to worry about rust. We make our own inserts in our CNC turning centers and use proper thread gages for quality control inspection. We turn a specially designed pattern on the outside diameter to maximize holding power of our proprietary mix of epoxy used to secure the inserts.

See Insert Torque and Available Standard Sizes

Holes
Tru-Stone is capable of providing holes for location, clearance or weight reduction. Holes range from as small as .188” for air ports to large wire-sawn holes for hubs or clearance.  If a hole must be placed near the edge, a good rule of thumb for design is to maintain a wall thickness of at least the diameter of the hole between the hole and the edge. 


Slots

T-slots are commonly incorporated into granite bases for flexibility in fastener location. T-slots are typically milled into steel bar stock and glued into the granite base.

T-slots can also be milled into the granite if required for your application.

LVDT
Adapters for LVDT Transducer assemblies (left)are available in standard and custom configurations to meet your application requirements.

 

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