Measuring Diameter with Tape

Preparation

• Ensure Tape & Object Cleanliness: Make sure both the tape and the object to be measured are clean and the tape is free of damage.

Measuring Process

1. Wrap the Tape:
   • Wrap the tape around the object.
   • Slide the tape back and forth to ensure it is evenly wrapped around the part.
2. Tension:
   • Tighten the tape around the object with 5 pounds of tension.

Reading the Scale

• Gauge Scale:
  • The vernier scale should be just below the gauge scale.
  • Each line on the gauge member represents 0.025 inches.
• Vernier Scale:
  • Each line on the vernier scale represents 0.001 inches.
• Determine Measurement:
  • Locate zero on the vernier scale.
  • Note the highest value on the gauge scale to the left of zero (e.g., 19.675 inches in the example).
  • Find the vernier scale value that lines up with a division on the gauge scale (e.g., 9 lines, which is 0.009 inches).

Calculating the Diameter

• Add Values Together:
  • Example calculation: 19.675 (gauge scale) + 0.009 (vernier scale) = 19.684 inches.

Additional Tips

• Large Diameter Measurement:
  • Use masking tape to maintain tape's parallel position.
  • Magnets can be utilized for maintaining position in some applications.

Maintenance

• Post-Use Care:
  • Wipe the tape clean after use.
  • Apply a light rust preventive oil.
  • Store the tape in the provided canister.