Engineering Workshop MECHANICAL THEORY

10 Measuring Instruments and their Uses in Engineering Workshop, AutoCAD Commands

Measuring Instruments plays a vital role in the Engineering Workshop. The Instruments duty is to measure the given specimen according to the given dimensions. Without these instruments, it is not possible to measure the dimensions of the specimen. Therefore, In this article, I will be explaining the 10 Measuring Instruments and their Uses in Engineering Workshop in a detailed way.

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Read:3 Types of Marking Out Tools used in Fitting – Engineering Workshop

Before knowing the instruments,yo u need to know the units of measurement in both C.G.S and M.K.S System and are as follows.

1.Metric system(C.G.S)

  • Length is measured in centimeter (cm)
  • Mass is measured in grams (gm)
  • Time is measured in second (s)

2.S.I system(M.K.S)

  • Length is measured in meter (m)
  • Mass is measured in Kilograms (kg)
  • Time is measured in second (s)
10 Measuring Instruments and their Uses in Engineering Workshop
10 Measuring Instruments and their Uses in Engineering Workshop

10 Measuring Instruments and their Uses in Engineering Workshop:

The 10 Measuring Instruments and their uses are presented below.

  1. Steel rule & Measuring Tape
  2. Surface Plate
  3. Divider
  4. Try square
  5. Inside Calliper
  6. Outside Calliper
  7. Odd leg caliper
  8. Vernier Calliper
  9. Micrometer
  10. Vernier Height Guage 

The detailed explanation of 10 Measuring Instruments and their uses are shown below.

1.Steel rule & Measuring Tape

Steel Rule:

  • It is an instrument in geometry which is used to measure the length, breadth, and height of the given specimen

Measuring Tape:

  • It is a flexible form of a ruler.
  • It is calibrated in terms of mm, cm and inches.

2.Surface  Plate

  • The Surface plate is used for testing the flatness of a w/p.
  • It is more precise than the marking table.
  • The surface plate is made up of C.I. or hardened steel or Granite stone.

Read: The Surface Plate used in Fitting-Engineering Workshop


This is used for marking circles, arcs, laying out perpendicular lines, bisecting lines etc. on the given specimen.

Read: Divider-Measuring Tools used in Engineering Workshop


  • It is used for marking and checking the right angles (Flatness & Squareness) of the given workpiece.
  • These Try squares come in various sizes from 75mm-300mm.

5.Inside caliper:

The inside caliper is used to measure the internal size of an object.

Read: Inside Caliper-Measuring Tools used in Engineering Workshop

6.Outside Calliper:

  • The outside caliper is used to measure the external size of an object.

Read: Outside Caliper-Measuring Tools used in Engineering Workshop

7.Odd-Leg Caliper:

  • This is also called “Jenny Caliper”.
  • This is used for marking parallel lines from a finished edge and also for locating the center.

8.Vernier Calipers

  • Vernier Callipers is used to measure the dimensions of the given specimen like diameter(Outer Dia and Inner dia), length and depth etc. For detailed information, click on the below link.
  • L.C. of Vernier Callipers is 0.02 mm.

Read: Vernier Callipers- Formula, Construction, Expt.-Every Engineer Must know


A micrometerr is used to measure the diameter of the given specimen only. It is not used to measure the depth of an object which can be done by measuring the depth probe of Vernier calipers.

  • L.C. of Micrometer is 0.01 mm.

10.Vernier Height Guage

  • A height gauge is a measuring device used either for determining the vertical distances or for the repetitious marking of items to be worked on.
  • The capacity of the height gauge is specified by the maximum height it can measure.
  • It varies from 150 mm to 1000 mm.

For Diagram and Parts of Vernier Height Guage, Click Here

This is the complete explanation of the 10 Measuring Instruments and their uses in a detailed way.

A Part from the Measuring Instruments used in Workshop, I will discuss a few types of instruments used in Production Labs also.

So, Let’s Start…

  1. Surface Measuring Instruments
  2. Linear Measuring Instruments
  3. Angular Measuring Instruments
  4. Taper Measuring Instruments

The explanation of the above Measuring Instruments is as follows.

1.Surface Measuring Instruments:

Under Surface Measuring Instruments, we have

  1. Profilometer
  2. Optical flat
  3. Surface Gauge
  4. Surface edge
  5. Surface plate

2.Linear Measuring Instruments:

Linear measuring instruments are divided into 4 categories and are as follows.

  1. Non–Precision Instrument
  2. Precision Instrument
  3. Comparators
  4. Measuring Machines

The measuring instruments which come under Non-Precision Instruments are

  1. Depth Gauge
  2. Dividers
  3. Steel rule
  4. Telescopic Gauge
  5. Calipers

The measuring instruments which come under Precision Instruments are

  1. Micrometers
  2. Slip Gauges
  3. Vernier Calipers
  4. Height Gauges

The measuring instruments which come under Comparators are

  1. Pneumatic
  2. Mechanical
  3. Optical
  4. Electrical

The measuring instruments which come under Measuring Machines are

  1. Co-Ordinate Measuring Machines (CMM)
  2. Tool Maker’s Microscope

3. Angular Measuring Instruments:

Angular measuring instruments are used for measuring the angularity of the given components. They are classified as

  1. Precision Instruments
  2. Non – Precision Instruments

Non – Precision Instruments

  1. Combination set
  2. Protractors
  3. Adjustable bevel

Precision Instruments

  1. Clinometers
  2. Bevel Protractor
  3. Dividing head
  4. Spirit level
  5. Sine bar
  6. Angle Gauge
  7. Autocollimators

4.Taper Measuring Instruments:

Taper measuring instruments are used for the measuring slope type of surfaces on the components.

  1. Taper micrometer
  2. Toolroom microscope
  3. Bevel Protractor
  4. Sine bar and dial gauge
  5. Autocollimators
  6. Slip gauges, Rollers and micrometer

AutoCAD Commands:

AutoCAD is one of the basic tools which is used in both the small scale and large scale industries. Autocad is the first software which has the ability to draw 2D Sketches and later it has upgraded to 3D models also. In this article, I will be listing out all the Editing commands, drawing commands, creating layers in Autocad and all the Shortcuts which are essential in using Autocad Software. 

autocad commands and its applications
AutoCAD commands and its applications

Image Credits:digitiseit

Tabular Column: Click on the links to Navigate

1.AutoCAD Commands

2.Drawing Commands in AutoCAD

3.Edit Commands in AutoCAD

4.Function Keys in AutoCAD

5.AutoCAD Applications

6.AutoCAD Features

AutoCAD Commands:

Drawing Commands in AutoCAD:

Command NameShort keysMenu BarResult of command  
LineLine/L Draw>LineDrawing a line from one point to another.
Arc      Arc/ADraw> Arc,Radius,CenterDrawing arcs based on radius, points, angles.


Draw a circle based on a center point & radius, diameter.
Spline        SplineSplineA spline is used to create the different path of Lines
EllipseEllipseEllipseEllipse of different sizes
PolygonPolygonPolygonAny No. of sides can be drawn by using this command
RectangleRecRectangleUsed to create rectangular bars or boxes.
PolylinePoly Draw>poly lineAn advanced of a line without any breaks.
 Copy CO –>Enter   Modify>Copy Used to copy any entity
HatchH–>Enter  Draw>HatchUsed to fulfill the line segments in the selected area.
TrimTR–>Enter Modify>Trim Remove unnecessary lines and points in the sketch region.
Mirror  MI–>Enter Modify>Mirror Creates a mirror image of a selection set or an object.
OffsetSelect object > O–>Enter  Modify>Offset Offsets set an object (parallel) by a set distance.
Extend EX–>Enter Modify>Extend Extends objects up to a selected boundary edge.
Fillet F–>EnterR–>Enter Modify>Fillet Creates a round corner between two lines
ChamferCHA–>Enter Modify>Fillet Creates a sharp corner between two lines.
 Scale  SC–>Enter Modify>Scale Used to change the size of the drawing.

Drawing Commands in AutoCAD:

 DIMENSION STYLE D-ENTEROpens dimension style manager interface.
 IMAGEIM – ENTERLaunch image manager.
 D VIEW DV – ENTERPerspective view.
LEADERLE-ENTERLeader line with annotation(TEXT)
MOVEM-ENTERMove the selected object from one place to another place.
LISTLI-ENTERDisplay information about drawing in a text window.
ERASEE – ENTERErase a selected drawing.
JP GOUTJP GOUT-ENTERCreates a JPEG file of current drawings.
DONUT DO-ENTER Draw a solid donut shape.
DIVIDE DIV-ENTERInserts point node a set division.
MATCH PROPERTIESMA-ENTERMatch properties of an object.
 DIST DI -ENTERCheck a distance between selected points.
 AD CENTER DC-ENTER Opens design center interface.
ROTATERO – ENTERRotate a selection of objects.
PANP-ENTERTo adjust drawing positions.
LAYOUTLO-ENTERCreates a new layout Interface.
 UNITSUN – ENTERDisplay drawing unit interface.
W BLOCKW – ENTERWrite a block.
 CUSTOMIZECUI – ENTEROpens customize user interface dialogue.
TABLETB – ENTEROpens insert a table dialogue box.
OPTIONSOP-ENTEROpen options dialogue box.
TEXTT – ENTERWrite text.
TOOL PALETTESTP – ENTERDisplay tool palette interface box.
PURGEPU-ENTEROpens purge interface box to remove unused elements.
LAYERLA-ENTEROpens the layer interface.
PROPERTIESPR-ENTEROpens properties dialogue box.
UNDOU – ENTERSelect the last command.
COLORCOL – ENTEROpens select color dialogue box. 
BLOCKB-ENTEROpens block dialogue box. 
SPELLSP – ENTERSpell check a selection – drawing check entire drawing.
 VIEWV – ENTER Opens view Manager dialogue box.
EXPLODEX – ENTERExplode single segment to component parts.
PLOTCTRL-POpens plot/print interface box.
RENAMEREN – ENTEROpens rename interface box to rename blocks, layers, etc

Edit Commands in AutoCAD:

Edit commands are used to Edit the given sketch in Autocad software.

edit commands in autocad
edit commands in AutoCAD
Modify Toolbar
S.No.Name of the Command
12Break at point
17Blend curves

Function Keys in AutoCAD:

TEXT SCRF2Open previous using command list
HELPF1Opens Autocad help
COORDS  F6 (or) CTRL+DCoordinate display on/off
SNAPF9 (or) CTRL+Bsnap on/off
DYN MODEF12Dynamic input ON/OFF
POLAR            F10 (or) CTRL+UPolar ON/OFF
Object snap tracking ON/OFF


 F5 (or) CTRL+E Iso planes activate

AutoCAD in Industrial Applications:

  • AutoCAD in Manufacturing Field
  • AutoCAD as an architectural planning tool
  • AutoCAD as an engineering drafting tool
  • AutoCAD in 3D Printing
  • AutoCAD as a graphic design tool
  • AutoCAD in the fashion industry
  • AutoCAD as an industrial design tool
  • AutoCAD in Mechanical Engineering

AutoCAD Features:

  • Revisions and modifications
  • 3D View
  • Storage and accessibility
  • Speed
  • Accuracy




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