A Fowler caliper is a precision measuring instrument commonly used in engineering, machining, and manufacturing for accurate linear measurements.
Key Features and Types
- Digital Calipers: Offer direct digital readout, often switchable between metric and imperial units.
- Dial Calipers: Use a dial indicator for precise readings, offering a good balance of accuracy and ease of use.
- Vernier Calipers: Utilize a Vernier scale for highly accurate measurements, requiring some skill to read correctly.
How to Use a Fowler Caliper
- Zeroing: Ensure the caliper is zeroed before taking any measurements. Close the jaws completely and check the reading. Adjust if necessary.
- Measuring: Open the jaws and position the workpiece between them. Gently close the jaws until they make contact with the workpiece.
- Reading: Read the measurement from the digital display, dial indicator, or Vernier scale, depending on the type of caliper.
Applications
- Measuring outside diameters of objects
- Measuring inside diameters of holes
- Measuring depths of holes or slots
- Measuring step distances
Care and Maintenance
- Keep the caliper clean and free from debris.
- Store the caliper in a protective case when not in use.
- Avoid dropping or subjecting the caliper to excessive force.
- Periodically check the accuracy of the caliper against a known standard.
Accuracy and Precision
Fowler calipers offer high accuracy and precision, typically within 0.001 inches (0.02 mm) or better, depending on the specific model and type. Proper use and maintenance are essential to maintain accuracy.
