Surface Plate Accessories

Surface Plate Accessories

Surface plate accessories Specification: Accuracy Granite Surface Plates are manufactured in three grades of accuracy: ◆ Grade AA - Laboratory Grade This is typically specified for precision operations in constant temperature gaging rooms and metrology departments. ◆ Grade A – Inspection Grade...

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Surface plate accessories

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Specification:

Accuracy

Granite Surface Plates are manufactured in three grades


of accuracy:

◆ Grade AA - Laboratory Grade

This is typically specified for precision operations in constant

temperature gaging rooms and metrology departments.

◆ Grade A – Inspection Grade

This is typically specified for general work in quality control.

◆ Grade B – Toolroom Grade

This is typically specified for production checking work

throughout the shop.

Unilateral Flatness Tolerance

Overall flatness tolerance is based on unilateral measurement.

All points on the work surface shall be contained between two

parallel planes separated at a distance no greater than the

amount specified for each particular grade and size as shown

in our listings.

Repeat Reading Tolerance

Repeat reading tolerance is easily checked with Repeat Reading

Gage. This gage detects local areas, not overall flatness

In addition to the overall flatness tolerance referred to above,


Fortune Machinery provides repeat reading tolerances as follows:

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Certified Accuracy

Before shipment, each surface plate must pass a critical final

inspection to prove that its entire surface is within the specified

tolerance. The final inspection is done with an autocollimator in

a controlled atmosphere.    

All shipments of precision granite products include a Certificate of Inspection.

Periodic Inspection

Every surface plate in use should be frequently inspected,

especially under shop conditions where abrasion is common. An

effective inspection program should include regular checks with an

autocollimator. If tolerance variations are excessive, the plate can

be transferred to work involving less accuracy or it can be

resurfaced to restore its original level of accuracy.

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