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Why surface plates are used for marking?

Why surface plates are used for marking? Correct Answer Because it provides datum surface / base

Explanation:

  • Surface plate is used to test the flatness of other surfaces or to provide a truly flat datum surface in marking off work for machining. 
  • The flat surface provides stability.
  • It is also used for inspection of gauges, jigs, and fixtures.
  • Surface plates are generally made of good quality cast iron which is stress-relieved to prevent distortion.
  • In order to retain its flatness, a surface pate must be treated with extreme care:
    • Always clean a surface plate with a soft dry cloth before use and cover it after use.
    • Slide heavy objects onto a surface plate rather than lowering them
    • Never hammer anything on a surface plate.

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