Mitutoyo 511-753 Dial Bore Gage Instruction Manual

1. Introduction

This manual provides essential instructions for the proper use, setup, and maintenance of your Mitutoyo 511-753 Dial Bore Gage. Designed for precision internal diameter measurements, this instrument offers high accuracy and reliability. Please read this manual thoroughly before using the device to ensure safe and optimal performance.

2. Product Overview

The Mitutoyo 511-753 is a high-precision dial bore gage engineered for measuring internal diameters within a range of 2 to 6 inches, with a resolution of 0.0001 inches. It features a robust design with carbide measuring faces for durability and consistent performance.

Figure 1: Mitutoyo 511-753 Dial Bore Gage. This image displays the complete assembly of the dial bore gage, including the dial indicator, handle, and measuring head with carbide faces.

Key Features:

• Measuring Range: 2 to 6 inches
• Graduations: 0.0001 inches
• Dial Reading: 0-5-0
• Standard Head Type
• Carbide Measuring Faces for enhanced durability
• Includes a fitted case for protection and storage

3. Setup and Calibration

Proper setup and calibration are critical for accurate measurements. The bore gage must be set to a known standard before use.

1. Unpacking: Carefully remove the dial bore gage and its components from the fitted case. Inspect for any visible damage.
2. Component Assembly:
   • Attach the appropriate measuring contact point and anvil to the measuring head based on the bore size to be measured.
   • Ensure the dial indicator is securely mounted to the gage body.
3. Calibration Standard: Obtain a suitable calibration standard, such as an outside micrometer or a master setting ring, that matches the nominal size of the bore you intend to measure. The accuracy of your measurements depends directly on the accuracy of your calibration standard.
4. Setting the Gage:
   • Place the measuring head of the bore gage into the calibration standard (e.g., between the anvils of an outside micrometer set to the desired dimension).
   • Gently rock the gage to find the minimum reading, which represents the true diameter.
   • Rotate the dial bezel until the dial indicator's needle points to zero at this minimum reading. This sets the gage to the reference dimension.
   • Verify the zero setting by removing and re-inserting the gage into the standard several times to ensure consistency.

Note: Always calibrate the bore gage to the specific nominal size you are measuring for optimal accuracy. Recalibrate if changing measuring contact points or if there is any doubt about the current setting.

4. Operating Instructions

Follow these steps for accurate bore measurement after proper setup and calibration:

1. Insert the Gage: Carefully insert the measuring head of the bore gage into the bore to be measured. Ensure the measuring faces are fully engaged with the bore walls.
2. Find the Minimum Reading: Gently rock the bore gage back and forth across the diameter of the bore. Observe the dial indicator. The lowest point indicated by the needle during this rocking motion represents the true diameter of the bore at that specific cross-section.
3. Read the Measurement:
   • If the needle moves to the right (clockwise) from zero, the bore is larger than the calibrated standard.
   • If the needle moves to the left (counter-clockwise) from zero, the bore is smaller than the calibrated standard.
   • The reading on the dial indicates the deviation from the set zero point. For example, if the gage was set to 3.0000 inches and the dial reads +0.0005, the actual bore size is 3.0005 inches. If it reads -0.0003, the actual bore size is 2.9997 inches.
4. Multiple Measurements: For critical applications, take multiple measurements at different depths and rotational positions within the bore to assess roundness, taper, and overall bore geometry.
5. Withdraw the Gage: Carefully remove the bore gage from the workpiece after measurement.

Important: Avoid applying excessive force during insertion or measurement, as this can lead to inaccurate readings or damage to the instrument.

5. Maintenance

Regular maintenance ensures the longevity and accuracy of your Mitutoyo Dial Bore Gage.

• Cleaning: After each use, wipe down the gage with a clean, lint-free cloth. If necessary, use a small amount of instrument cleaning fluid. Avoid harsh solvents that could damage the finish or internal components.
• Lubrication: Periodically apply a thin film of light instrument oil to moving parts, such as the plunger mechanism, to ensure smooth operation. Do not over-lubricate.
• Storage: Always store the dial bore gage in its original fitted case when not in use. This protects it from dust, moisture, and physical damage. Store in a dry, temperature-controlled environment.
• Inspection: Regularly inspect the carbide measuring faces for wear or damage. Worn faces can lead to inaccurate readings and should be replaced by a qualified technician.
• Calibration Checks: Perform periodic calibration checks against known standards to confirm the gage's accuracy. The frequency of these checks should be determined by usage intensity and required precision.

6. Troubleshooting

This section addresses common issues you might encounter with your dial bore gage.

For issues not listed here or if solutions do not resolve the problem, please contact Mitutoyo customer support or an authorized service center.

7. Specifications

8. Warranty and Support

Mitutoyo products are manufactured to high standards of quality and precision. For specific warranty information, please refer to the documentation included with your product or visit the official Mitutoyo website. In case of technical questions, service requirements, or to register your product, please contact Mitutoyo customer support.

Mitutoyo Official Website: www.mitutoyo.com

Please have your model number (511-753) and serial number ready when contacting support.