Moore & Wright Spring Joint Internal Caliper - 150mm (6in)

The Moore & Wright Spring Joint Internal Calipers are manufactured from polished tool steel. Their...

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Product Information

Full details

This guide is for machinists, engineers, and hobbyists needing precise internal measurements. The Moore & Wright 150mm (6in) Spring Joint Internal Caliper offers reliable, consistent tension for accurate readings, though its mechanical nature requires careful handling for best results. It features a polished tool steel construction, a bow spring for uniform tension, and a centrally mounted adjustment screw, conforming to BS3123 standards.

All features

Model Part Number5063750552163
BrandMoore & Wright

Extended Product Information

FAQs

What is the primary use of this caliper?

This caliper is designed for measuring internal dimensions, such as the diameter of holes or the width of internal grooves.

How do I ensure an accurate measurement?

Ensure the caliper jaws are set slightly larger than the opening, insert them carefully, and then tighten the adjustment screw until a light, consistent pressure is felt against the internal walls. Hold the caliper perpendicular to the surface.

What does 'Spring Joint' refer to?

It refers to the type of pivot mechanism that uses a bowed spring to provide tension and keep the caliper jaws closed or open, allowing for adjustment.

Can I use this for external measurements?

No, this is specifically an internal caliper designed for measuring inside dimensions. External measurements require a different type of caliper.

What does compliance with BS3123 mean?

It means the caliper meets specific British Standards for spring joint calipers, indicating a level of quality, dimensional accuracy, and performance defined by the standard.

How should I store the caliper when not in use?

Store the caliper in a clean, dry place, preferably in a protective case or on a clean surface where the jaws won't be subjected to pressure or damage.

Troubleshooting

Jaws do not close or open smoothly.

Check the adjustment screw for debris or damage. Clean and lightly lubricate the screw threads. Ensure the bow spring is not bent.

Inconsistent readings.

Ensure the caliper is held perpendicular to the surface being measured. Check that the adjustment screw is tightened evenly and that the bow spring provides consistent pressure.

Rust spots on the surface.

Clean the rust gently with a fine-grade steel wool and then apply a light coat of oil for protection. Ensure the tool is dried thoroughly after cleaning and stored in a dry environment.

Pros and Cons

Pros

  • Durable construction from polished tool steel.
  • Consistent and uniform tension due to the bow spring.
  • Precise adjustments are possible with the central screw.
  • Meets recognized BS3123 standards for quality assurance.

Cons

  • Mechanical design may be less forgiving of minor user error compared to digital calipers.
  • Requires manual setting and reading, which can be slower than digital alternatives.
  • Susceptible to damage if dropped or misused due to its mechanical nature.

Setup, Compatibility & Care

Setup: These calipers require no complex setup. They are ready for use out of the box. Ensure the adjustment screw moves freely.

Compatibility: Designed for general internal measurement tasks. Compatible with standard workshop environments.

Care: To maintain accuracy and longevity:

  1. Cleaning: After each use, wipe the caliper with a clean, dry cloth to remove any dust or debris.
  2. Lubrication: Apply a light coat of instrument oil to the adjustment screw threads occasionally to prevent stiffness.
  3. Storage: Store the calipers in a protective case or drawer to prevent damage to the jaws and mechanism. Avoid storing with heavy objects that could warp the jaws.

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