Moore & Wright 1961M Traditional External Micrometer User Manual

Introduction

This manual provides comprehensive instructions for the proper use, maintenance, and care of your Moore & Wright 1961M Traditional External Micrometer. Designed for precise external measurements, this instrument features a pearl chrome plated frame with insulation pads, tungsten carbide measuring faces, and a tapered bow frame. Adhering to BS870, DIN 863/1, and ISO 361 standards, it ensures reliable and accurate measurements.

Figure 1: Moore & Wright 1961M Traditional External Micrometer. The image displays the full micrometer, showing its C-shaped frame, anvil, spindle, sleeve with main scale, thimble with vernier scale, ratchet stop, and locking lever.

Setup and Initial Inspection

Upon receiving your micrometer, perform the following steps:

1. Unpacking: Carefully remove the micrometer from its plastic pocket case.
2. Visual Inspection: Examine the micrometer for any signs of damage during transit. Ensure all components, including the frame, anvil, spindle, sleeve, thimble, ratchet stop, and locking lever, are intact and free from defects.
3. Cleaning: Before first use, gently wipe all measuring surfaces and the spindle with a clean, lint-free cloth. Avoid using abrasive materials or harsh chemicals.
4. Zero Adjustment:
   • Clean the measuring faces of the anvil and spindle.
   • Carefully close the micrometer by turning the ratchet stop until the spindle makes contact with the anvil. Do not overtighten; stop when the ratchet clicks 2-3 times.
   • Check if the zero mark on the thimble aligns precisely with the main line on the sleeve.
   • If misalignment occurs, use the adjusting key (supplied) to rotate the sleeve until the zero mark aligns. For minor adjustments, the thimble can be rotated slightly after loosening the locking lever.

Operating Instructions

Follow these steps for accurate measurement:

1. Holding the Micrometer: Hold the micrometer firmly by the frame, preferably by the insulation pads, to minimize heat transfer from your hand, which can affect accuracy.
2. Positioning the Workpiece: Place the object to be measured between the anvil and the spindle.
3. Advancing the Spindle: Rotate the thimble to bring the spindle close to the workpiece. For final contact, use the 'speeder' type ratchet stop. Turn the ratchet until it clicks 2-3 times, ensuring consistent measuring force.
4. Locking the Measurement: Once the measurement is taken, engage the locking lever to prevent the spindle from moving, preserving the reading.
5. Reading the Measurement:
   • Main Scale (Sleeve): Read the largest whole millimeter value visible on the sleeve. Each major line represents 1mm, and each minor line below the main line represents 0.5mm.
   • Thimble Scale: Read the line on the thimble that aligns with the main line on the sleeve. Each division on the thimble represents 0.01mm.
   • Total Measurement: Add the readings from the main scale and the thimble scale to get the total measurement.

   Example: If the main scale shows 10.5mm and the thimble scale shows 25 (0.25mm), the total measurement is 10.5 + 0.25 = 10.75mm.

6. Removing the Workpiece: Disengage the locking lever and carefully open the micrometer before removing the workpiece.

Maintenance

Proper maintenance ensures the longevity and accuracy of your micrometer:

• Cleaning: After each use, wipe the micrometer clean with a soft, lint-free cloth. Pay special attention to the measuring faces and the spindle. If necessary, use a small amount of instrument cleaning fluid, applied to the cloth, not directly to the micrometer.
• Lubrication: Periodically apply a very thin film of light machine oil to the spindle thread to ensure smooth operation. Do not over-lubricate.
• Storage: Store the micrometer in its supplied plastic pocket case when not in use. Keep it in a clean, dry environment, away from direct sunlight, extreme temperatures, and corrosive substances. Ensure the measuring faces are slightly separated (0.01-0.05mm) to prevent pressure on the faces and potential corrosion.
• Calibration Checks: Regularly check the zero point calibration. For critical applications, periodic professional calibration is recommended.
• Handling: Avoid dropping or subjecting the micrometer to impact, as this can damage its precision components.

Troubleshooting

Here are solutions to common issues you might encounter:

If problems persist, contact Moore & Wright customer support or a qualified technician.

Specifications

The Moore & Wright 1961M Traditional External Micrometer adheres to high precision standards:

• Model: 1961M
• Measuring Range: 0-25mm
• Resolution: 0.01mm
• Measuring Faces: Tungsten Carbide
• Frame: Pearl Chrome Plated, Tapered Bow Frame with Insulation Pads
• Spindle Diameter: 6.5mm
• Ratchet Type: 'Speeder' type ratchet stop
• Standards: Manufactured to BS870, DIN 863/1, ISO 361
• Accuracy: 0.003mm
• Flatness of Measuring Faces: 0.001mm
• Parallelism of Measuring Faces: 0.003mm
• Product Dimensions: 3 x 7.01 x 14 cm
• Item Weight: 240.4 g
• Manufacturer Part Number: MAW1961M

Warranty Information

Moore & Wright products are manufactured to high standards and are subject to rigorous quality control. For specific warranty terms and conditions applicable to your 1961M Traditional External Micrometer, please refer to the warranty card included with your purchase or visit the official Moore & Wright website. Keep your proof of purchase for any warranty claims.

Customer Support

For technical assistance, spare parts, or further inquiries regarding your Moore & Wright 1961M Traditional External Micrometer, please contact Moore & Wright customer support. Contact details can typically be found on the manufacturer's official website or within the product packaging.

Manufacturer: Moore & Wright

Note: Always refer to the latest information provided by the manufacturer for the most accurate support details.