Podcast
Questions and Answers
What is a surface plate used for?
What is a surface plate used for?
- As a benchmark for all measurements (correct)
- Only for precision gauging
- Only for tooling setup
- For inspection and precision gauging
A surface plate can be easily bent or warped by an external force.
A surface plate can be easily bent or warped by an external force.
False (B)
What is the purpose of a calibration certificate for a surface plate?
What is the purpose of a calibration certificate for a surface plate?
To emphasize flatness complying to the standards
A surface plate must be made of a material that is resistant to ______________ and corrosion.
A surface plate must be made of a material that is resistant to ______________ and corrosion.
What is flatness in the context of a surface plate?
What is flatness in the context of a surface plate?
Match the following applications with the type of surface plate:
Match the following applications with the type of surface plate:
A surface plate can be used to confirm the flatness of other materials and measuring tools.
A surface plate can be used to confirm the flatness of other materials and measuring tools.
What are the requirements for the material used to manufacture a surface plate?
What are the requirements for the material used to manufacture a surface plate?
What is a common method of using a height gage to evaluate flatness on a surface plate?
What is a common method of using a height gage to evaluate flatness on a surface plate?
Surface plates should be calibrated only once a year.
Surface plates should be calibrated only once a year.
What is the primary use of a surface plate?
What is the primary use of a surface plate?
The flatness accuracy of the surface plate must be checked on a __________ basis to make sure the surface is in an ideal condition.
The flatness accuracy of the surface plate must be checked on a __________ basis to make sure the surface is in an ideal condition.
Match the following precautions with their corresponding descriptions:
Match the following precautions with their corresponding descriptions:
What is the greatest source of wear and tear on a surface plate?
What is the greatest source of wear and tear on a surface plate?
Surface plates are used to test the flatness of other surfaces only.
Surface plates are used to test the flatness of other surfaces only.
What is the recommended frequency for calibrating surface plates?
What is the recommended frequency for calibrating surface plates?
What is the overall flatness of a surface plate?
What is the overall flatness of a surface plate?
Glass Surface Plates are still widely used in industry today.
Glass Surface Plates are still widely used in industry today.
What is the standard size for local flatness measurement?
What is the standard size for local flatness measurement?
The accuracy of overall flatness depends on the __________________ and grade of the surface plate.
The accuracy of overall flatness depends on the __________________ and grade of the surface plate.
What is the main disadvantage of Cast Iron Surface Plates?
What is the main disadvantage of Cast Iron Surface Plates?
What is the result of adding the highest and lowest measured points on a surface plate?
What is the result of adding the highest and lowest measured points on a surface plate?
Match the following surface plate types with their corresponding standards:
Match the following surface plate types with their corresponding standards:
Cast Iron Surface Plates are resistant to thermal expansion.
Cast Iron Surface Plates are resistant to thermal expansion.
Study Notes
What is a Surface Plate?
- A surface plate is a very flat surface, also known as the true plane, with high accuracy of flatness, squareness, and straightness.
- It serves as a benchmark for all measurements.
Properties of a Surface Plate
- Must have a high degree of rigidity to withstand heavy loads and resist bending.
- Must have resistance to wear and corrosion.
- Must be free from warping and twisting.
Material Properties of a Surface Plate
- Flatness refers to the difference between the highest and lowest points on a surface, within a tolerance zone.
- Flatness is measured in 3D, whereas straightness is measured in 2D.
Applications of Surface Plates
- Used to test the flatness of other surfaces or provide a truly flat datum surface for machining.
- Used with a height gage to evaluate flatness.
Precautions while using Surface Plates
- Regularly check the flatness accuracy of the surface plate.
- Clean the top surface before use to avoid dust and polluted particles.
- Cover the top surface when not in use to prevent damage.
- Use the plate uniformly to avoid uneven wear.
- Coat the top surface with corrosion-resistant elements like oil or grease after use.
Surface Plates Checks and Calibration
- Surface plates check and zero out other pieces of equipment.
- Calibrate surface plates regularly, ideally every six months, to ensure accuracy.
Types of Surface Plates
- According to material used, there are two major types: Granite Surface Plate (ISO 8512-2) and Cast Iron Surface Plate (ISO 8512-1).
- Glass Surface Plate is also available, but not preferable due to its fragility.
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Description
A surface plate is a highly accurate flat surface used as a benchmark for measuring flatness, squareness, and straightness of other materials and tools.
