1. Introduction
This manual provides essential instructions for the safe and effective use, maintenance, and care of your Mitutoyo 505-681 Dial Caliper. This precision instrument is designed for accurate measurement in various applications, including woodworking and industrial settings. Please read this manual thoroughly before using the caliper to ensure optimal performance and longevity.
2. Product Features
- High Precision: Offers an accuracy of 0.01mm for reliable measurements.
- Versatile Measurement Modes: Capable of measuring outer diameter (OD), inner diameter (ID), depth, and step.
- Durable Construction: Made from high-quality stainless steel for long-lasting performance.
- Clear Dial Display: Features an easy-to-read dial for quick and precise readings.
- Shockproof Design: Engineered to withstand typical workshop conditions.
3. Package Contents
Upon opening the package, please verify that all items listed below are present and in good condition:
- Mitutoyo 505-681 Dial Caliper
- Protective Storage Case
- Certificate of Inspection
4. Specifications
| Attribute | Value |
|---|---|
| Brand Name | Mitutoyo |
| Model Number | 505-681 |
| Material | Stainless steel |
| Accuracy | 0.01mm |
| Measurement Range | 0 - 300 MM |
| Caliper Type | Vernier Calipers |
| Gauge Type | Caliper with watch (Dial display) |
| Battery Included | No |
5. Setup and Preparation
- Unpacking: Carefully remove the dial caliper from its protective case.
- Initial Cleaning: Wipe down the measuring surfaces with a clean, lint-free cloth to remove any protective oil or dust.
- Check for Damage: Inspect the caliper for any visible damage that may have occurred during transit. If damaged, do not use.
- Zeroing the Caliper:
- Close the measuring jaws completely.
- Ensure the dial indicator points exactly to zero. If it does not, loosen the bezel clamp screw and rotate the bezel until the zero mark aligns with the needle. Tighten the screw.
6. Operating Instructions
The Mitutoyo 505-681 Dial Caliper allows for four primary types of measurements:
6.1. Outer Diameter (OD) Measurement
- Open the main jaws of the caliper.
- Place the object to be measured between the main jaws.
- Gently close the jaws until they make firm contact with the object. Use the thumb roller for fine adjustment.
- Read the measurement from the main scale and the dial indicator.
6.2. Inner Diameter (ID) Measurement
- Use the small upper jaws of the caliper.
- Insert the upper jaws into the opening of the object.
- Open the jaws until they make firm contact with the inner walls.
- Read the measurement from the main scale and the dial indicator.
6.3. Depth Measurement
- Place the end of the main beam on the top surface of the object.
- Extend the depth rod into the hole or recess until it touches the bottom.
- Read the measurement from the main scale and the dial indicator.
6.4. Step Measurement
- Place the end of the main beam on the higher surface of the step.
- Extend the movable jaw until its end rests on the lower surface of the step.
- Read the measurement from the main scale and the dial indicator.
6.5. Reading the Dial Caliper
- The main scale provides readings in millimeters (mm).
- The dial indicator provides the fractional part of the millimeter, typically in 0.01mm increments.
- Combine the reading from the main scale (the whole number before the dial) with the reading from the dial (the decimal part) for the total measurement.
For a visual demonstration of the caliper's features and usage, please watch the following video:
Video 1: Demonstration of Mitutoyo Dial Caliper features and measurement techniques.
7. Maintenance and Care
- Cleaning: After each use, wipe all measuring surfaces with a clean, dry, lint-free cloth. Avoid using harsh chemicals or abrasive materials.
- Lubrication: Apply a very thin coat of light machine oil to the sliding surfaces periodically to ensure smooth operation and prevent corrosion.
- Storage: Always store the caliper in its protective case when not in use to prevent damage from dust, moisture, and impact.
- Handling: Handle the caliper with care. Avoid dropping it or subjecting it to excessive force, as this can affect its accuracy.
- Calibration: For professional applications, periodic calibration by a qualified technician is recommended to maintain certified accuracy.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Inaccurate readings | Debris on measuring surfaces; improper zeroing; physical damage. | Clean surfaces thoroughly; re-zero the caliper; inspect for damage and consider professional repair if necessary. |
| Sticking or rough movement | Accumulation of dirt or lack of lubrication. | Clean the sliding surfaces and apply a thin coat of light machine oil. |
| Dial needle does not return to zero | Bezel not properly adjusted or internal mechanism issue. | Loosen bezel clamp screw, rotate bezel to align zero, then tighten. If issue persists, seek professional service. |
9. User Tips
- Always ensure the measuring surfaces are clean before taking a measurement to avoid errors.
- Apply consistent, gentle pressure when closing the jaws to prevent deformation of the object or the caliper.
- When measuring depth, ensure the main beam is flush against the reference surface for accurate results.
- Avoid exposing the caliper to extreme temperatures or humidity, which can affect its precision.
10. Warranty and Support
For information regarding warranty coverage, technical support, or service, please refer to the documentation provided with your purchase or contact Mitutoyo customer service directly. Keep your proof of purchase for any warranty claims.