What is the accuracy of surface plate?
Apart from the given height map, some meaningful characteristic parameters: sphericity, torsion and waviness are obtained. They have been proven very valuable to record long term effects of surface plates. Reliable measurements with an accuracy of 0.1 μm/m demonstrate the capabilities of the method.
What are the grades of surface plates?
ASME B89. 3.7 defines standardized tolerance grades for surface plates. The highest accuracy plates are called Grade AA, and they are often found in calibration laboratories. Grade B plates are the lowest accuracy plates, and they might be found on shop floors.
Does a surface plate need to be level?
Leveling is not necessary to maintain the accuracy of a properly supported plate. Learn more by calling us at (800) 959-0517.
What is a grade AA surface plate?
Grade AA (Laboratory Grade) surface plates are made to the best tolerance of flatness and repeatability. These AA plates are thicker than lesser grade plates, so they have less deflection and are intended for permanent installation.
What is accuracy of surface plate in MM?
The surface plate is often used as the baseline for all measurements to the workpiece, therefore one primary surface is finished extremely flat with accuracy up to . 00001″/. 00025 mm for a grade AA or AAA plate.
What is a grade 0 surface plate?
The surface plate is often used as the baseline for all measurements to a workpiece, therefore one primary surface is finished extremely flat with tolerances below 11.5 μm or 0.0115 mm per 2960 mm for a grade 0 plate.
What are the specifications of surface plate?
PRECISION CAST IRON SURFACE PLATES – SPECIFICATIONS
|SIZE (mm)||GRADE “0”||WEIGHT (kg)|
|300 x 300||4.0||21|
|400 x 400||4.5||50|
|450 x 300||4.0||39|
|450 x 450||4.5||62|
How flat is a surface plate?
How do you calibrate a granite surface plate?
Pour a small amount of surface plate cleaner on a clean, soft cloth and wipe the surface of the granite. Immediately dry the cleaner off the surface plate with a dry cloth. Do not allow the cleaning liquid to air-dry. Place a repeat measuring gauge on the center of the granite surface plate.
How is a surface plate calibration?
The Surface Plate Calibration Process During calibration, our technicians will measure both surface flatness and repeatability by taking measurements in locations across the surface. Flatness is measured using points on the surface contained within two parallel planes, the base plane and the roof plane.
Which surface plate has a high accuracy?
Granite is considered to be the best material for a surface plate due to its surface hardness, low thermal expansion, no rust or corrosion, little warping, and long wear life attributes. These attributes result in very accurate, stable and precise measurements.