24 Questions
What is the primary reason for preserving the measuring accuracy and performance of measuring instruments?
To enable effective quality control
What can result from neglecting periodic inspection of measuring instruments?
Variations in measurements
How should a micrometer be stored when not in use?
In a well-ventilated and dust-free environment
What can occur if a micrometer is inaccurate?
Products may be shipped with poor quality
Why is it essential for all employees concerned to understand the importance of maintaining precision measuring equipment?
To ensure proper maintenance
What affects the degree of deterioration of a micrometer?
Frequency of use and environmental conditions
What is the recommended separation of the measuring faces when storing a micrometer?
0.1 mm to 1 mm
What is the consequence of poor maintenance of measuring instruments?
Poor quality control, leading to considerable losses
What should be done to remove any burrs found on the measuring faces of a micrometer?
Use a fine-grained oilstone
What is the likely cause of a micrometer's thimble rotating tightly or stickily?
Run out of the spindle
What should be done to prevent parallax errors when using a micrometer?
Make sure the anvils are parallel to the workpiece
What is the correct procedure to clean a micrometer?
Dismantle, wash in clean solvent, and re-lubricate before assembly
What should be done to ensure accurate measurement with a micrometer?
Check the micrometer zero before use
What should be done to prevent damage to the micrometer's mechanism?
Avoid using abrasive materials to clean the micrometer
What should be done to a micrometer with an ineffective clamp?
Return the micrometer to the manufacturer for repair
What should be done to the spindle and measuring faces before use?
Wipe off any dust with a clean lint-free paper or cloth
What is the primary reason for inspecting the micrometer after it has been dropped or subjected to a blow?
To check the zero point, measuring force, fit conditions, run out of the thimble, parallelism between the measuring faces and the instrumental error
What is the recommended way to store a micrometer when not in use?
Tightly wrapping the instrument with an oil-soaked paper or cloth before putting it in the case
What should be done to prevent rust on the measuring faces of a micrometer?
Applying high-grade rust-preventing oil to the measuring faces
What is the purpose of wiping the spindle before using the micrometer?
To remove any cutting or grinding swarf from the spindle
Why is it essential to eliminate excessive play or backlash in the micrometer's spindle?
To increase the measurement accuracy
What should be done to the measuring faces of a micrometer before storing it?
Wiping them with a dry cloth and applying rust-preventing oil
What is the purpose of checking the parallelism between the measuring faces of a micrometer?
To prevent parallax errors
What should be done to the micrometer if it is not going to be used for an extended period?
Wiping it thoroughly and applying high-grade rust-preventing oil
Study Notes
Micrometer Storage and Maintenance
- Store micrometers in a low humidity, well-ventilated, and dust-free environment.
- Leave the measuring faces separated by 0.1 mm to 1 mm to prevent damage.
- Do not clamp the spindle when storing the micrometer.
- Store micrometers in a case or container when not in use to prevent damage.
Importance of Maintenance
- Poor maintenance leads to poor quality control, resulting in considerable losses due to out-of-tolerance parts.
- Inaccurate micrometers can result in entire batches of products failing to meet specifications.
- Neglecting periodic inspection of measuring instruments can result in variations of measurements, causing problems between the design department, shop floor, and inspection room.
Maintenance and Inspection
- Check the micrometer after it has been dropped or subjected to a blow.
- Check the zero point, measuring force, fit conditions, run out of the thimble, parallelism between the measuring faces, and instrumental error.
- Clean and apply rust-preventing oil to the micrometer after use.
- Wipe off oil, cutting or grinding fluid, fingerprints, and contaminants from the micrometer.
- Inspect the micrometer thoroughly before use after a long period of storage.
Cleaning and Rust Prevention
- Wipe carbide tipped measuring faces thoroughly with a dry cloth.
- Apply rust-preventing oil to the measuring faces if they are not carbide tipped.
- Wipe cutting or grinding swarf from the spindle before using the micrometer.
- Apply high-grade rust-preventing oil to the micrometer if it is not going to be used for an extended period.
- Protect the micrometer from dampness by tightly wrapping it with an oil-soaked paper or cloth before putting it in the case.
Storage of Micrometers
- Store micrometers in a place with low humidity and small temperature changes.
- Do not expose the micrometer to direct sunlight.
- Check for scratches and burrs on the measuring faces before storing.
- Use a fine-grained oilstone to remove any burrs found.
Checking Micrometer Functionality
- Check that the thimble turns evenly and does not stick to the sleeve.
- Check the rotation of the thimble and adjust the collet if necessary.
- Ensure the ratchet turns evenly and clean or replace it if necessary.
- Check the clamp is effective and adjust or replace it if necessary.
- Do not immerse the micrometer in solvent or use compressed air to clean it.
- Wipe off any dust from the micrometer before use and thoroughly wipe the spindle and measuring faces.
Learn about the proper storage and maintenance of micrometers to ensure accurate measurements and quality control. Discover the importance of preserving measuring accuracy and performance.
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