Introduction
Surface plates are commonly used in manufacturing industries for inspection, layout, and leveling purposes. They provide a stable and flat surface on which various objects can be checked for accuracy in their dimensions and flatness. When it comes to choosing the right surface plate, there are several factors to consider, such as size, material, accuracy, and cost. In this article, we will look at these factors in detail so that you can choose the right surface plate for your needs.
Size
The size of the surface plate you need will depend on the types of objects you plan to inspect, the size of your workspace, and your budget. Surface plates come in various sizes, starting from small plates that are a few inches square to large plates that are several feet long and wide.
If you are working with small parts, such as those found in electronics, a small surface plate may be sufficient. However, if you are inspecting larger objects, such as engine blocks or airplane components, you will need a larger surface plate.
It''s important to note that larger surface plates will also be more expensive. If you have limited space and budget, you may need to compromise on size and choose a smaller plate.
Material
Surface plates are made from various materials, including granite, cast iron, and steel. Each material has its advantages and disadvantages, and the material you choose will depend on your specific needs.
Granite is the most common material used for surface plates. It is highly resistant to wear and tear, and its thermal stability makes it ideal for use in temperature-controlled environments. Granite is also non-magnetic, which is important for certain types of inspections.
Cast iron surface plates are also quite common. They are less expensive than granite plates and are suitable for general inspection purposes. However, they are more vulnerable to rust and wear.
Steel surface plates are the least common. They are typically used in high-precision applications where a non-deformable, magnetic surface is required. Steel plates are also relatively heavy, making them less portable than other types of plates.
Accuracy
The accuracy of your surface plate depends on the grade of the plate. Surface plates are graded according to the level of accuracy they provide, and each grade has its tolerance limits.
Grade AA plates are the most accurate and have tolerances of +/- 0.00001 inch per foot. Grade A plates have tolerances of +/- 0.00005 inch per foot, while Grade B plates have tolerances of +/- 0.0001 inch per foot.
Choosing the right grade of surface plate will depend on your specific needs. If you are working with high-precision equipment, such as aerospace components or medical devices, you will need a Grade AA plate. However, if you are working on more general products, a Grade A or B plate may be sufficient.
It''s important to note that higher-grade plates are more expensive than lower-grade plates. If you require high accuracy but have a limited budget, you may need to compromise on size or material.
Cost
The cost of a surface plate will depend on several factors, such as size, material, and accuracy. As mentioned earlier, larger plates are generally more expensive than smaller plates. Granite plates are also more expensive than cast iron plates.
Additionally, higher-grade plates are more expensive than lower-grade plates. A Grade AA plate can cost up to ten times more than a Grade B plate.
When choosing a surface plate, it''s important to consider your budget and choose the best plate that fits within your budget. If you require high accuracy and cannot afford a Grade AA plate, you may need to compromise on size or material.
Maintenance
Proper maintenance of your surface plate is important to ensure its accuracy and longevity. The following are some maintenance tips for your surface plate:
- Clean the plate regularly with a non-abrasive cleaner and a soft cloth.
- Store the plate in a temperature-controlled environment to prevent warping and deformations.
- Avoid dropping heavy objects on the plate as this can cause damage to the surface.
- Do not use the plate as a workbench or a cutting surface as this can scratch the surface.
- Inspect the plate regularly for any signs of wear or damage and have it calibrated if necessary.
Conclusion
Choosing the right surface plate for your needs requires careful consideration of factors such as size, material, accuracy, cost, and maintenance. It''s important to choose a plate that provides the level of accuracy you require but also fits within your budget. Proper maintenance is also important to ensure the longevity and accuracy of your surface plate.
