Quick, precise and operator-friendly – the M-SURE Centering Indicator is a vital tool for machinists and engineers who need to align workpieces to spindle centre with accuracy. This guide will walk you through correct setup and operation for repeatable centring every time.
Getting Started: Precautions and Handling
Before using your M-SURE Centering Indicator:
- Always run your machine spindle at low RPM during centring procedures.
- This is a precision measuring instrument – avoid excessive force.
- Do not overtighten the locking screw when securing the feeler arm.
- Avoid exposing the indicator to liquids, extreme humidity, or temperature changes.
- Never clean the indicator with solvents. Use only a soft cloth with cleaning oil.
- Handle with care – impacts or dropping can affect calibration.
Tool Features
Retaining Arm: Allows the indicator dial to face the operator for easier visibility during alignment.
Adjustable Feeler Arm: The feeler can be angled to suit various workpiece diameters, offering flexibility during setup.
Aligning a Workpiece to Spindle Centre
- Install the Feeler: Choose the appropriate feeler arm based on your workpiece size. Carefully insert it into the indicator body and secure with the locking screw.
- Position the Feeler: Rotate the feeler arm so it gently contacts the outer edge of the workpiece. Ensure smooth, light contact – do not force.
- Attach the Retaining Arm: Screw in the retaining arm and rest it against a fixed stop or part of the machine. This prevents the indicator from rotating with the spindle.
- Initial Check by Hand: Turn the spindle by hand to ensure the feeler moves freely and gives consistent needle motion. This gives you a rough alignment before starting the spindle.
- Spindle Start (Low Speed): Power up the spindle at the lowest RPM possible. The needle on the indicator dial will begin to swing back and forth.
- Y-Axis Alignment: Slowly adjust the Y-axis of your machine until the needle movement becomes minimal.
- X-Axis Alignment: Slowly adjust the X-axis. Again, look for the point of least needle movement.
- Fine Adjustment: Repeat movements on both axes until the indicator needle shows minimum or no movement. This indicates the spindle is now aligned to the centre of the workpiece.
Final Tips for Best Results
- Always stop the spindle before making any feeler or arm adjustments.
- Use a clean and smooth workpiece surface for accurate contact.
- Avoid distractions – watch the needle closely for the smallest swing.
- Store the indicator in its case when not in use to prevent accidental damage.
Common Issues & Solutions
| Problem | Possible Cause | Solution |
|---|
| Needle jumps or sticks | Dirty feeler or contact point | Clean gently with soft cloth and oil |
| Excessive needle swing | Misalignment, feeler angle incorrect | Recheck workpiece position, adjust feeler |
| No needle movement | Feeler not contacting surface | Reposition feeler gently against surface |
| Dial hard to read | Retaining arm not properly fixed | Reposition dial to face operator |
Final Notes
- M-SURE offers a variety of feeler arm types for different applications, including flat, spherical, blade, and extension styles.
- The centring indicator should always be stored in a dry, stable environment to maintain accuracy.
- With careful handling and correct setup, your M-SURE centring indicator will deliver years of repeatable performance in any workshop.
