1. Introduction
This manual provides essential instructions for the safe and effective use, setup, operation, and maintenance of your Mitutoyo 2923SB-10 Dial Indicator. This precision measuring tool is designed for accurately measuring small linear distances and surface variations in industrial, laboratory, and mechanical applications. Please read this manual thoroughly before using the instrument to ensure optimal performance and longevity.
2. Safety Information
- Always handle the dial indicator with care to prevent damage to its delicate internal mechanisms.
- Avoid dropping the instrument or subjecting it to strong impacts.
- Do not attempt to disassemble the indicator unless specifically instructed by authorized service personnel.
- Keep the instrument clean and free from dust, dirt, and corrosive substances.
- Store the dial indicator in its protective case when not in use to prevent damage.
- Ensure the mounting setup is stable and secure to prevent the indicator from falling during use.
3. Product Overview
The Mitutoyo 2923SB-10 is a standard dial indicator featuring a 0.375" diameter stem and a #4-48 UNF contact point thread mount. It is designed for precise measurement of surface variations in fractional inches. Key features include a rotating bezel, limit markers, and a choice of flat or lug back for versatile mounting.
Figure 1: Mitutoyo 2923SB-10 Dial Indicator. This image shows the complete dial indicator assembly, including the main body with its white dial, the stem, and the contact point. The flat back mounting option is visible.
3.1 Components
- Dial Face: Displays measurements, typically white with clear markings.
- Bezel: Rotatable ring around the dial face, used for zero-setting.
- Limit Markers: Adjustable indicators on the bezel to mark tolerance limits.
- Spindle/Plunger: The movable rod that extends and retracts, transferring displacement to the dial mechanism.
- Contact Point: The tip of the spindle that makes contact with the workpiece. Threaded #4-48 UNF for interchangeability.
- Stem: The cylindrical part used for clamping the indicator to a stand or fixture (0.375" diameter).
- Back: The rear mounting surface, available as flat or lug back.
4. Setup
4.1 Mounting the Dial Indicator
The 2923SB-10 offers flexible mounting options:
- Flat Back Mounting: For clamp-mounting on the stem or plate-mounting on the rear. Secure the stem firmly in a suitable stand or fixture.
- Lug Back Mounting (if applicable): If your model includes a lug back, use the protrusion with a hole to mount the indicator using a lug, nut, and bolt. The lug can typically be rotated to a vertical or horizontal position as needed.
Ensure the indicator is mounted securely and rigidly to prevent any movement during measurement that could affect accuracy.
4.2 Attaching the Contact Point
The contact point threads onto the end of the spindle. Ensure it is securely tightened by hand. The #4-48 UNF thread allows for interchangeability with various contact points if required for specific applications.
4.3 Zero-Setting the Indicator
- Position the contact point against a known reference surface or the part to be measured at its nominal dimension.
- Gently lower the indicator until the spindle is slightly compressed.
- Rotate the outer bezel until the "0" mark on the dial aligns with the main pointer.
- The indicator is now zero-set and ready for comparative measurements.
5. Operating Instructions
5.1 Taking a Measurement
- After zero-setting, move the indicator to the point on the workpiece where the measurement is required.
- Allow the contact point to gently touch the surface. The spindle should move smoothly.
- Read the deflection indicated by the main pointer on the dial face.
- For the 0-5-0 balanced dial, readings to the right of zero indicate positive deviation, and readings to the left indicate negative deviation from the set zero point.
5.2 Using Limit Markers
The two adjustable limit markers on the bezel can be set to indicate the upper and lower tolerance limits for a measurement. Once set, any reading outside these markers indicates an out-of-tolerance condition, allowing for quick visual inspection.
5.3 Understanding Readings
The 2923SB-10 has a graduation of 0.0001" (one ten-thousandth of an inch). Each small division on the dial represents 0.0001". The 0-5-0 reading indicates a balanced dial, meaning it measures deviation from a set reference point. The total range is 0.5".
6. Maintenance
6.1 Cleaning
- Wipe the exterior of the indicator with a clean, soft, lint-free cloth.
- For stubborn dirt, use a cloth lightly dampened with isopropyl alcohol. Avoid harsh solvents.
- Ensure no liquids enter the internal mechanisms of the indicator.
- Keep the spindle and contact point clean to ensure smooth movement and accurate readings.
6.2 Storage
When not in use, store the dial indicator in its original protective case in a dry, clean environment, away from direct sunlight, extreme temperatures, and vibrations. Ensure the spindle is retracted to prevent accidental damage to the contact point.
6.3 Calibration
Regular calibration by qualified personnel or an accredited laboratory is recommended to maintain the accuracy of your dial indicator, especially in critical applications. Refer to industry standards and your quality control procedures for calibration intervals.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Pointer does not move smoothly or sticks. | Dirt or debris on the spindle; internal mechanism damage; bent spindle. | Clean the spindle thoroughly. If the problem persists, contact authorized service. |
| Inaccurate readings. | Improper zero-setting; loose mounting; worn contact point; internal wear; temperature fluctuations. | Re-zero the indicator. Ensure secure mounting. Inspect contact point for wear. Allow instrument to acclimate to ambient temperature. Consider professional calibration. |
| Bezel is difficult to rotate. | Dirt or foreign material under the bezel. | Gently clean around the bezel. Do not force rotation. |
For issues not listed or if solutions do not resolve the problem, contact Mitutoyo customer support or an authorized service center.
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | 2923SB-10 |
| Brand | Mitutoyo |
| Range | 0 - 0.5 inches |
| Graduation | 0.0001 inches |
| Accuracy | +/-0.0002 inches |
| Dial Reading | 0-5-0 (Balanced Dial) |
| Dial Diameter | 2.244 inches |
| Stem Diameter | 0.375 inches |
| Contact Point Thread | #4-48 UNF |
| Back Type | Flat Back (choice of flat or lug back available for the model series) |
| Product Dimensions | 5.2 x 3.3 x 2.3 inches |
| Item Weight | 6.4 ounces |
| Standards Met | ANSI, JIS B7503-1997, AGD |
9. Warranty Information
For detailed warranty information regarding your Mitutoyo 2923SB-10 Dial Indicator, please refer to the warranty card included with your product or visit the official Mitutoyo website. Warranty terms and conditions may vary by region and purchase date.
10. Customer Support
Should you require technical assistance, service, or have questions about your Mitutoyo 2923SB-10 Dial Indicator, please contact Mitutoyo customer support or an authorized Mitutoyo service center. Contact information can typically be found on the official Mitutoyo website or in the product packaging.
Mitutoyo America Corporation: www.mitutoyo.com