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Surface Plates
Tru-Stone produces surface plates that meet or exceed federal specification ASME B89.3.7 and are stringently tested to ensure top-quality performance and reliability.
Surface Plates
DESCRIPTION
- Most surface plates are made from Superior Red or Crystal Pink granite. Black diabase or gray plates are available upon request.
- Plates are produced to meet or exceed federal specification ASME B89.3.7.
- Final inspection performed with an autocollimator or electronic levels & Repeat-O-Meter.
- All surface plates are engineered to support a loading weight of 50 pounds per square foot loaded in the center of the plate.
- Custom sizes are available upon request.
- This allows the designated load to be placed in the center of the plate without deflecting the overall accuracy more than 50%.
- Special loading & size considerations quoted upon request.
Flatness is very important in surface plates; however, repeat reading is equally important. The flatness and repeat readings of Tru-Stone plates are unilateral*, not bilateral**.
The values specified on Tru-Stone calibration certificates are the TIR (total indicator reading). In addition to our standard surface plate sizes, we will quote any other size requirements you may have. We can also make modifications to your plate, which includes t-slots, inserts, holes, etc.
| Superior Red Granite | Crystal Pink Granite | Black Granite | |
|---|---|---|---|
| True granite | X | X | |
| Excellent hardness/wearability | X | X | |
| Superior stiffness | X | X | |
| Able to achieve fine surface finish | X | X |
*The term unilateral accuracy means that all points on the work surface are contained between two parallel planes, separated by a distance equal to the distance specified for each size and grade.
**The term bilateral accuracy means twice (+ or – the accuracy stated) as much flatness deviation may exist.
