Granite is a superior material for surface plates because it is durable, precise, and low maintenance. Granite is resistant to rust and corrosion, and it's almost impossible for it to warp.
The critical characteristics of granite for surface plates are its stiffness, hardness, density, and wear resistance.
To support a granite surface plate, you should:
Match a three-point stand to three points under the surface plate.
Support the plate on its three marked suspension points.
While surface plates may appear similar to any other work surface, they are precision instruments. Despite granite's strength and durability, regular use can lead to wear spots. Even minor surface variations can distort measurements and compromise product quality.
Periodically rotate the plate's orientation to distribute wear evenly and extend its lifespan.
Keep the plate covered when not in use, as dust acts as an abrasive and accelerates wear.
Clean the surface plate before and after use to prevent grease and debris build-up.
Avoid water-based solutions, as granite absorbs water. Use acetone or alcohol-based cleaners for the best results, but be mindful of the cooling effect they cause.
Over-tightening can stress the plate. Refer to the manufacturer's torque specifications.
Inspect regularly for damage. Use a silicon carbide stone to remove burrs around nicks and maintain an even surface.
Distribute weight evenly and avoid applying unnecessary pressure or weight on the plate.
Surface plates are precision instruments, not tables. Avoid placing food, drinks, or other items that can damage the surface.
Ensure consistent humidity and temperature to prevent expansion and contraction. Keep the plate away from direct sunlight to avoid uneven heating.
Calibrate the plate every six months to three years based on usage. Use a repeat-o-meter to monitor deviations and determine the ideal calibration interval.
Although following these steps will help increase the life and usability of your surface plate, all surface plates will eventually suffer wear from everyday use. Regular calibration and the occasional resurfacing are the only ways to ensure a truly flat and level surface.
To ensure your surface plate lasts as long as possible, follow these maintenance tips:
1. Proper Installation
Install the surface plate on the support system it was designed for. Removing it from this system can affect its accuracy since it was lapped while resting on it.
2. Clean Often & Keep Covered
Clean the surface plate frequently with granite surface plate cleaner. Avoid using cleaners that may leave residue or cause wear. After cleaning, allow the plate to normalize for 1-5 hours, depending on its size. Always cover the plate when not in use to protect it from nicks, debris, and foreign objects that can cause wear.
3. Test Regularly for Accuracy
Use a repeat reading gauge to check the plate's accuracy regularly, ideally monthly. Ensure measurements remain consistent across the surface for precise results.
4. Use Multiple Spots for Measurements
Avoid overusing a single spot. Rotate the plate periodically and use different areas to prevent uneven wear.
Avoid these common mistakes to preserve your surface plate:
1. Don't Use if Out of Tolerance
If the surface plate is out of tolerance, relap it before use to prevent inaccuracies.
2. Don't Use as a Table
Using the surface plate as a work table will accelerate wear and shorten its lifespan. It also increases the risk of dropping foreign objects that could cause damage.
3. Use Slings When Moving
Never use metal forklift forks directly on the granite surface. Always use slings to move the plate safely.
4. Don't Use Water-Based Cleaners or Volatile Solvents
Water-based cleaners can cause granite to retain moisture, leading to rust on metal parts. Volatile solvents can cause surface wear and chilling effects on the plate.
5. Don't Position Near Temperature Changes
Avoid placing the surface plate in areas subject to temperature fluctuations, drafts, or heat sources like lighting fixtures. Temperature changes can affect granite's stability and accuracy.
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