Moore & Wright Firm Joint Inside Caliper - 150mm (6in)
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Full details
This Moore & Wright Firm Joint Inside Caliper (150mm/6in) is ideal for machinists and tradespeople needing precise internal measurements. Its rigid friction joint ensures stable readings without play, though users should be aware that the stated capacity is approximate and can exceed the effective leg length. Key features include polished tool steel construction, a large headed nut and screw assembly for secure adjustment, and adherence to BS3123 standards.
All features
| Model Part Number | 5063750552057 |
|---|---|
| Brand | Moore & Wright |
Extended Product Information
FAQs
What does 'Firm Joint' mean?
A 'Firm Joint' indicates that the caliper has a friction-based locking mechanism, typically using a nut and screw, designed to hold its set position without slipping during use, providing stability for measurements.
What is the difference between 'effective leg length' and the caliper's capacity?
The 'effective leg length' is the actual measuring length of the caliper's legs from the joint. The caliper's total capacity is generally about one-third greater than this effective leg length, meaning it can open wider than its stated leg measurement.
Are these calipers suitable for precision engineering?
While manufactured to BS3123 standards and offering a firm joint for stability, these calipers are best suited for general workshop use and trades where high precision is not the primary requirement. For extremely high-precision applications, consider digital calipers or micrometers.
How do I maintain the firm joint over time?
Regular cleaning and light oiling of the nut and screw assembly will help maintain the firmness and smooth operation of the joint. Avoid over-tightening, which can damage the threads.
What standards does this caliper meet?
This Moore & Wright Firm Joint Inside Caliper is manufactured to BS3123 standards, a British Standard for measuring instruments.
Can I use this caliper to measure external dimensions?
No, this is an 'Inside Caliper' specifically designed for measuring internal dimensions, such as the diameter of holes or slots. External calipers are used for measuring outside dimensions.
Troubleshooting
Caliper joint is too loose and does not hold position.
Tighten the large headed nut and screw assembly. Ensure the screw is properly seated and engaging with the nut. If the joint remains loose, the threads may be worn, and the tool may need replacement.
Caliper joint is too stiff and difficult to adjust.
Clean the joint and screw assembly thoroughly with a dry cloth. Apply a small amount of light machine oil to the threads and pivot point, then work the joint back and forth to distribute the lubricant. Avoid excessive force.
Inconsistent or inaccurate measurements.
Ensure the caliper is clean and free from debris. Check that the joint is securely locked before taking a measurement. Verify that the effective leg length is appropriate for the measurement task and that the reading is taken from a reliable scale.
Pros and Cons
Pros
- Durable and corrosion-resistant construction from polished tool steel.
- Secure and stable friction joint prevents unwanted movement.
- Manufactured to recognized BS3123 standards for reliability.
- Offers a measuring capacity that often exceeds the nominal leg length.
Cons
- The firm joint may require initial adjustment to find optimal tension.
- Not suitable for applications requiring extreme precision beyond the tool's specifications.
- Requires careful handling and maintenance to preserve joint integrity.
Setup, Compatibility & Care
Setup: The Moore & Wright Firm Joint Inside Caliper requires no complex setup. Upon receiving the tool, inspect it for any visible damage. The adjustment nut and screw assembly may require initial manipulation to achieve the desired tension for the firm joint. Test the movement of the legs to ensure they open and close smoothly and lock securely.
Compatibility: This caliper is designed for general-purpose internal measurements. It is compatible with standard measuring tools such as micrometers or vernier scales for obtaining precise readings of the caliper's spread.
Care: To ensure longevity and accuracy:
- Cleaning: Clean the tool regularly with a soft, dry cloth. For stubborn residue, use a cloth lightly dampened with oil, then wipe dry.
- Lubrication: Periodically apply a light machine oil to the joint and screw assembly to maintain smooth operation and prevent rust.
- Storage: Store the caliper in its retail packaging or a protective case in a dry environment to prevent damage and corrosion.
- Handling: Avoid dropping the caliper or subjecting it to excessive force, which could damage the joint or affect its accuracy.