Marking and Measuring Instruments

Marking and Measuring Instruments are essential tools used in various trades and industries to ensure accuracy in the layout, measurement, and inspection of components or materials before and during manufacturing or construction processes.

1. Marking Instruments

These are tools used to scribe or draw lines, shapes, or reference points on workpieces, typically before cutting, drilling, or machining. Accuracy in marking ensures the final product meets specifications.

Common Marking Tools:

• Scriber: A pointed tool used to scratch fine lines on metal surfaces.

• Marking Gauge: Used to draw lines parallel to the edges of a workpiece (mostly in woodworking).

• Centre Punch: Used to mark the center of a point, often before drilling to prevent drill bit wandering.

• Surface Plate: A flat reference plane used in conjunction with marking tools for precision.

• Divider/Compass: For marking circles or arcs.

2. Measuring Instruments

These tools are used to determine and verify dimensions such as length, height, depth, and angles. They are critical for ensuring components fit and function correctly.

Common Measuring Tools:

• Steel Rule: A straight-edge ruler for basic linear measurement.

• Vernier Caliper: Measures internal, external, and depth dimensions with high accuracy.

• Micrometer: Offers very precise measurements, typically used for small components.

• Measuring Tape: A flexible ruler used for longer measurements.

• Protractor: Measures angles.

• Try Square/Engineer’s Square: Checks and marks right angles.

• Spirit Level: Checks horizontal or vertical alignment.