marking out (layout) and tool setting.
Since the surface plate is often used as the baseline for all measurements on the workpiece,
one major surface is extremely flat with an accuracy of 0.00001 in or 250 nm for AA or AAA grades.
The surface plate is the most common tool in the manufacturing industry and is often permanently attached to
a robotic test device such as a coordinate system.
Plates are typically square or rectangular.
One current UK standard includes specifications for plates from 160 mm × 100 mm to 2500 mm × 1600 mm.
Granite surface material
Damage to the granite surface plate generally produces chips, but does not affect the accuracy of the entire plane.
Although crumbling, other flat surfaces can still come into contact with the undamaged portion of the crushed surface plate,
but damage to the cast plate often raises the surrounding material on the work surface so that
the test object is no longer placed parallel to the surface plate I will.
Granite is also inherently stable, non-magnetic and has excellent vibration damping properties and does not rust.
Plates are used with accessories such as square, straight, gauge blocks, sine bars, sine plates, dial indicators,
parallel plates, angle plates and height gauges.