Indicators

To check runout on a lathe, use a dial indicator with a measuring range of 5 to 10 mm and a resolution of 0.01 mm. Mount the indicator on a magnetic base attached to the cross slide or the lathe bed.

Measurement procedure:

• Position the contact point perpendicular to the surface of the part
  
• Set the dial to zero at a reference point
  
• Manually rotate the part one full revolution
  
• Record the total indicated runout (TIR – Total Indicator Reading)
  

A variation below 0.02 mm indicates acceptable concentricity for most mechanical applications. For precision parts requiring tighter tolerances, use an indicator with 0.001 mm resolution.

Standard dial indicators with 0.01 mm resolution typically cost between $40 and $120 depending on brand and measuring range. High-precision indicators with 0.001 mm resolution generally range from $150 to $250.

Typical price ranges:

• Entry-level indicators (occasional use): $25 to $50
  
• Standard professional indicators: $60 to $120
  
• High-precision indicators: $150 to $250
  

Investing in a professional indicator from a recognized brand ensures measurement reliability, repeatability, and longer service life.

Entry-level indicators are suitable for training or occasional use but lack the robustness required for daily industrial environments. Équipement Industriel Polar offers competitive pricing on professional-grade indicators.

Resolution refers to the smallest readable graduation on the dial, typically 0.01 mm or 0.001 mm. Accuracy represents the maximum permissible error of the instrument over its full measuring range and is expressed as a tolerance.

An indicator with 0.01 mm resolution may have an accuracy of ±0.002 mm, meaning displayed measurements can vary by ±0.002 mm from the true value. Accuracy depends on internal mechanism quality, gear backlash, and calibration.

For critical measurements, select indicators with accuracy at least five times better than the tolerance being checked. For example, to verify ±0.02 mm tolerances, use an indicator with ±0.004 mm accuracy or better.

Clean indicators after each use with a soft cloth to remove metal dust and cutting fluids. Apply a drop of light oil to the sliding contact point monthly to prevent sticking and corrosion.

Essential maintenance practices:

• Always store indicators in padded cases after use
  
• Avoid impacts or drops that can damage the mechanism
  
• Protect from moisture and temperature fluctuations
  
• Never use compressed air directly on the mechanism
  
• Periodically verify accuracy using gauge blocks
  

Never attempt to disassemble an indicator for internal cleaning, as the mechanisms are assembled with micrometric tolerances. If the indicator shows abnormal operation, consult a specialized repair service.

Measuring indicators are covered by the standard manufacturer warranty against defects in materials and workmanship. This warranty excludes normal wear, accidental damage, and misuse.

Équipement Industriel Polar also offers:

• 30-day return policy if the product is unsuitable (unused)
  
• Free technical support for proper product selection
  
• Assistance validating technical specifications
  
• Referrals to accredited calibration services
  

Proper handling and storage are strongly recommended to maximize service life. Our technical team reviews each claim to determine the cause and appropriate solution in accordance with manufacturer warranty terms.