Precision Metrology Lab

Lab Information [Doc]

Dr. N. Venkaiah (Lab I/C)
Prof. A. Venu Gopal

Phone: 0870-246-2350 (O), 9441933382 (M)

Laboratory staff:

The Precision Metrology laboratory at NIT Warangal is to provide the students with an active learning environment for the measurement technologies used in production engineering field.  Students use the laboratory to collect and analyze measurement data, evaluate measurement methodologies, and learn the capabilities and limitations of measurement technologies.

Lab Coverage:
Linear Measurements, Angular Measurements, Level Measurements, Surface Roughness, Form Measurements, Gear Measurements, Thread Measurements

Lab Manual (Click for PDF)

Services Offered to:

  1. 3rd Year B. Tech. Mechanical Engineering – 2nd Semester : Machining and Metrology Laboratory (ME355)
  2. B. Tech. Project Works
  3. M.Tech. Dissertation Works
  4. Ph.D. Works

Equipment Details:

S. No Equipment, Utility & Specifications Photograph
1 Co-ordinate Measuring Machines (CMM)


Make: Mitutoyo

This is a CNC controlled CMM consisting of a contact probe and a means of positioning the probe in three dimensional space relative to the surface of a work part in order to obtain the data concerning the part size and geometry.


  • Dimensional measurement
  • Profile measurement
  • Angularity or orientation
  • Depth mapping
  • Digitizing or imaging


Model CRT- Apex C544
Make Mitutoyo Corporation, Japan
Construction type Bridge type
Based on the Axis Vertical type
Probe Touch trigger type
Measuring range X – axis 19.88” (505 mm)
Y-axis 15.94”(405 mm)
Z- axis 15.94”(405 mm)
Resolution 0.000004” (0.0001 mm)
Drive speed CNC mode Max. moving speed = 430 mm/s


Max. measuring speed = 8 mm/s

Joystick mode moving speed = 0-80 mm/s


measuring speed = 0-3mm/s

Max.  acceleration 0.17G (3D)
Measuring table Material Granite stone
Size 25.12” X 33.86” (638 mm X 860 mm)
Work piece Max. height 21.46” (545 mm)
Max. weight 220 lbs (100 kg)
Dimensions Width 42.60” (1082 mm)
Depth 43.46” (1104 mm)
Height 86.02” (2185 mm)
Machine weight 1133 lbs (515 kg)
Air consumption 50 L/min or 1.8 CFM


(Under normal condition)

Air pressure 0.4 MPa (4 kgf/cm2 ) or 58 PSI
Temperature Range 1 64.4°F – 71.6°F (18°C-22°C)
Range 2 60.8°F – 78.8°F (16°C-26°C)
Variation /hr 1.8°F (1.0°C)/hour
Variation/day Range 1 = 3.6°F (2.0°C)/day,


Range 2 = 9.0°F (5.0°C)/day

Gradient 1.8°F (1.0°C)/m (Vertically),


1.8°F (1.0°C)/m (Horizontally)

2 Autocollimator


Make: Accurate

An autocollimator is an optical instrument that is used to measure small angles with very high sensitivity.


To verify the accuracy of a rotary table using autocollimator and polygon

To compare work angle with standard angle block

To verify straightness of movement along machined rails

To determine flatness of surface plates etc.


Make Prisms India Pvt. Ltd.
Objective lens clear aperture 37 mm
Focal length 430 mm
Eye piece 16XWF
Range of measurement 20 min
Field of view 120 mm
Means of readout Micrometer
Measurement axis Single/Dual
No of divisions on micrometer drum 120
Direct reading 1 s
Accuracy over 1 min 5 s
Accuracy over full range 10 s
Best accuracy 3 s
Reflector diameter 50 mm
Power supply 220 V AC 50-60Hz
3 Handy surf.


Make: Ziess

It is a portable surface roughness measuring device. It allows not only measurements on flat surfaces, but also on vertical and overhead surfaces.


It is used to measure the surface roughness of any surface

It is very easy in use and  portable so roughness of vertical and overhead surfaces can also measure.


Make Carl Zeiss India Pvt. Ltd.
Traversing length 12.5 mm
Measuring range 40/160 µm/Auto
Resolution 0.02 µm
Radius of diamond stylus 5 µm
Display LCD, 16 digit x 2 lines
4 Floating Carriage Diameter Measuring M/c


Make: Accurate

Used for accurate measurement of screw threads.

Make Accurate
Range 0.25-5.00 mm Pitch Threads
Accuracy  Dia Size ± 0.0005 mm
Cylindricity of wires Within 0.001 mm
Size (mm) 0.170, 0.195, 0.220, 0.250, 0.290, 0.335, 0.390, 0.455, 0.530, 0.620, 0.725, 0.895, 1.10, 1.35, 1.65, 2.05, 2.55, 3.20



5 Tool Maker’s Microscope


This is used for measurement of parts of complex figure profiles of external threads, tool templates and gauges.


Determination of relative position by using protractor

Measurement of angle by using protractor eyepiece

Comparison in eyepiece measurement of pitch and effective diameter

Comparison of an enlarged protector image with a tracing fixed to projecting



Make Hilger & Watts, England
Least count 0.025 mm
Work size Diameter Up to 50 mm
Length 95mm
Transformer FF2  4V, 0.5 Amps
Camera For capturing images
6 Mechanical Comparator


The comparator is a device which takes a dimension of standard job as reference dimension, and gives a reading to a pointer on a scale, the variation in such dimension of the job to be compared


Used to measure the roundness of any object


Make Sigma
Accuracy 0.025 µm
Measurement range 25  µm
Least count 0.5 µm
7 Optical Comparator


An optical comparator (often called just a comparator in context) is a device that applies the principles of optics to the   inspection  of manufactured parts. In a comparator, the magnified image  of a part is projected upon the screen, and the dimensions and geometry of the part are measured against   prescribed limits.


Used to measure the dimensions of a body

Two dimensions can be measured at a time


Make Leitz wetzlar
Accuracy 0.5 µm
Measuring range 70 µm
Least count 1 µm
8 Optical Dividing Head


It is a device Used to divide circumference of work piece into equally spaced divisions when milling gear teeth, squares, hexagons, and octagons


It is  used to rotate work piece at predetermined ratio to table feed rate

Used in gear cutting process


Make Carl Zeiss
Least count 1 min
Magnification 60
Height of Centers 90 mm
Length between Centers 850 mm
9 Digital Micrometer


A micrometer is  a device used for precise  measurement of small distances. It is based on electrical technology the measurement will be displayed.


It is used where high accuracy is required

It can be zeroed at any position, which greatly speeds of inspection


Least count 0.01 mm
Range 25 mm
10 Digital Vernier Callipers


The vernier caliper is a device used to measure the dimension of cylindrical objects. In this the measurement can be displayed digitally


Used to measure inside diameter of holes, pipes etc

Used to measure the outside diameter of the pipes, bars etc

Used to measure the depth of the hole.


Least count 0.02 mm
Range 300 mm
11 Vernier calipers


The vernier caliper is a device used to measure the dimension of cylindrical objects.

Utility :

Used to measure inside diameter of holes, pipes etc

Used to measure the outside diameter of the pipes, bars etc

Used to measure the depth of the hole.


Least count 0.02 mm
Range 200 mm
12 Height gauge


A height gauge is a measuring device used to determine the height of something.

Utility :

Used to measure the difference in height of two points

Used to measure the step height

Used to measure the internal and external diameters


Make Mitutoyo
Least count 0.02 mm
Range 350 mm
13 Cylindrical square



Sizes 3” , 6” , 12”
14 Demonstration gauge set


These are the devices by which one can know the manufactured or machined object is within the tolerance limits or not.


GO-NOGO Plug gauge 25H7
Snap gauge 25h7 ( 2 Nos)
Taper plug 25 mm
For checking internal thread GO-NOGO M18x2-6H
GO-NOGO M16 20x2P-6H
15 Sine bar


Checking taper angle of jobs without centers. The angle is measured on sine principle


Center distance 100mm
16 Gauge block set



Sizes 1.005,1.01,1.02……….1.49
1.6, 1.7, 1.
0.5, 1,…..9.5
10, 20,…..100

Precision Metrology Lab

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