Metrology Report

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  • Topic: Measurement, Metalworking measuring instruments, Dimensional instruments
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  • Published : March 17, 2013
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Andrew Diaz
Metrology Report
Engineering Applications EG1089


Aim: To become familiar with various measuring equipment and accessories and how they are applied in production/manufacturing industry.

Objective: Use various measuring instruments to measure engineering components with respect to engineering drawings. Understand the safety rules in the lab. Identify the accuracy of measuring tools and the importance of metrology in industry and manufacturing as well as preparing inspection planning sheets for quality control.


Vernier Caliper (Digital/Manual):

This device is used to measure lengths and the diameter of a component, giving precise readings. It has a pair of external and internal jaws that are used to measure the dimensions of an object; this is done by having one movable jaw and one fixed. Measurements are read from a graduated bar. [3] Accuracy: + 0.02mm

Slip gauges:

Slip gauges are metallic or ceramic blocks with two opposing faces that are ground precisely flat and parallel, at a precise distance apart. Accuracy of the slip gauges depends on the various grades, with higher grades being of higher accuracy and precision. [1]

Angle Dekkor:

This measuring tool uses the principle of auto collimation to measure small angles of components. It can also be used as a measure of perpendicularity (squareness). [2]

Optical flat testing machine:

This device is used as a reference to compare the flatness of an object with the use of optical flats, which are precisely polished flat surfaces. When placed on the surface of a component, dark and light bands will form under monochromatic light. The shape of these bands gives a visual representation of the flatness of the object being tested.

Dial test indicator (DTI):

Taper Measuring Machine:

Shadow Graph:

OMT Roundness testing machine:

Mechanical comparator:

This is a gauging device for comparative measuring, where the linear movement of a pointer and precision spindle is adjusted and displayed on a dial. [11] Accuracy: + 0.01mm

Electronic comparator:

Surface texture machine:


Much like the Vernier, this instrument is used to measure the diameters and thickness of objects, though it provides more precision. The micrometer incorporates a calibrated screw and a graduated scale to measure components [5], with an anvil face and spindle face to keep the object in place. A ratchet is turned until the object is trapped within the two faces. [6] Accuracy: +0.01mm

Bench micrometer:[6] This device works in the same vain as the micrometer. Using the spindle and ratchet to trap a component within the anvil and spindle faces, a measurement can be read from the scale. Accuracy: + 0.01

Sine bar:

Co-ordinate measuring machine (CMM):

Metric rollers:


Steel rule:

This instrument contains calibrated lines[10] and is used to measure distances and can be used to draw straight lines. Accuracy: +0.5mm

Vernier height gauge:

This device is used to set or measure the vertical height of a component. The sharpened pointer acts as a scriber to assist in marking items that are being worked on. [7] Accuracy: 0.002mm


Bench Comparator:

This device works much like the other comparators however the indicator is used on a stand that provides a locating surface for the instrument. [12]

Procedure (Block component):

Using the inspection sheet and engineering drawing in tandem, the dimensions of a component can be measured using the various measuring instruments at our disposal, in this case the block component.

Dimension A: This distance is the width of the block which, according to the drawing, should be 47.52mm with a tolerance of +0.01. To measure this dimension two instruments were suggested; a manual Vernier Caliper and a micrometer. The first instrument...
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