Umesh Kumar Meher discusses the design and working of a pneumatic grinding machine. The machine uses compressed air to power a rotary vane motor which turns the grinding wheel. It can grind metals and has advantages over electric grinders such as being portable, economical to operate, and producing less noise. However, it is less efficient than electric motors and more expensive due to the compressor. The document provides details on the specifications of the pneumatic motor, grinding wheel, and the working mechanism of the pneumatic grinding machine.

1. Umesh Kumar Meher

2. Pneumatic Grinding Machine
Pneumatics is a section of technology
that deals with the study and application
of pressurized air/gas to produce
mechanical motion.
Grinding is a process carried out with a
grinding wheel made up of abrasive grains
for removing very fine quantities of material
from the work piece surface.

3. • Utility grinding machines
• Floor mounted utility grinding machine
• Bench type utility grinding machine
• Bench-type utility drill grinding machine
• Milling and grinding lathe attachment
• Surface grinding machine

4. The surface grinding machine is used for grinding flat surfaces.
The work piece is supported on a rectangular table which moves
back and forth and reciprocates beneath the grinding wheel.
Reciprocating surface grinding machines generally have
horizontal wheel spindles and mount straight or cylinder-type
grinding abrasive wheels.

7. An air compressor is a device
that converts power (usually from
an electric motor, a diesel engine or
a gasoline engine) into kinetic
energy by compressing and
pressurizing air, which, on
command, can be released in quick
bursts.
Specification

8. A pneumatic motor
or compressed air
engine is a type of
motor which does
mechanical work by
expanding compressed
air.

9.  The pneumatic motor used in our project is known as a
rotary vane motor, uses air to produce rotational motion to a
shaft.The rotating element is a slotted rotor which is
mounted on a drive shaft. Air is pumped through the motor
input which pushes on the vanes creating the rotational
motion of the central shaft.
 Rotation speeds can vary between 100 and 25,000 rpm
depending on several factors which include the amount of air
pressure at the motor inlet and the diameter of the housing.
Model BVS 130
Weight 0.286/.587 kg
Dia of pneumatic turbine 70.6mm
Dia of rotor 67.6mm
Dia of spindle 7.93mm
Dia of inlet and outlet port 3.9mm
Specifications

10.  A grinding wheel is an expendable wheel
that is composed of an abrasive compound
used for various grinding (abrasive cutting)
and abrasive machining operations.
Abrasive
Type
Grit Size Grade Structure Bond
A 126 H 5 S
Al2O3 Fine Soft Close Pack Silicate
Grinding Wheel Specification
Grinding wheel Specification

11. Abrasive material Percentage Work material Colour
Aluminium Oxide
97-99% Al2O3 Hardened steel, HSS White
87-96% Al2O3 Steel, cast iron Pink to brown
Silicon Carbide
96-99% SiC HSS,
cemented carbides
Green
<96% SiC Aluminium , brass, brittle
materials
Black
Cubic Boron Nitrate (CBN) Tool steels, aerospace alloys
Synthetic Diamond Ceramics,
cemented carbides

13. The compressed air from the air compressor passed through the
inlet port of the pneumatic turbine.
 The high pressure and high velocity air then strike the vertical
blades/slots.
 This compressed air cause the blades to rotate in very high
range, ranging from 1500 to 12000 rpm depending upon the supply
of compressed air.
This rotor then cause the whole pneumatic circuit to rotate thus
the spindle and shaft connected to it rotates.
Then the spindle rotation cause the rotation of the grinding wheel
connected to it.
The compressed air once strike to the blades again comes out of
the turbine by an exhaust port that present in the turbine.

15. The grinding/grinding speed can be varied according to our
needs by adjusting the timer.
It is portable
It does not have any Prime mover, like electric motor related
to the unit.
As the air is freely available, we can utilize the air to cut the
metal and hence it is economical.
Simple in construction than mechanical hacksaw and grinder
It is a compact one
Less Maintenance
No lubrication required
Noiseless
Can be rotate in both clockwise and anti-clockwise direction

16. Only smaller size and soft metal can be cut
It is costlier than the conventional one because of
compressor unit.
Less efficiency when compressed to mechanical device.
Leakage of air affects the working of the unit.
High initial cost

17. •Rao N P , ManufacturingTechnology, volume-2, Metal Cutting And Machine
Tools, 2nd Edition, Tata McGraw-Hill Publication, New Delhi, 2009
•Mallik Kumar Asok Ghosh Amitabha, Manufacturing Science, 2nd Edition, EWP
Publication, New Delhi, 2010
•http://en.wikipedia.org/wiki/Pneumatic_motor
•Pneumatic engines for power tools (http://www.directindustry.com/cat/motors-
geared-motors-motion-control/pneumatic-motors-D-77.html)
•Engineers Edge. Pneumatic actuator design and operation. Retrieved from
http://www.engineersedge.com/hydraulic/pneumatic_actuator.htm
•Braun, Adolphe: Luftlokomotive in "Photographische Ansichten der
Gotthardbahn", Dornach im Elsass, ca.1875
•http://en.wikipedia.org/wiki/Grinding_wheel
•http://www.smithy.com/machining-handbook/chapter-8/page/3
•http://www.vibco.com/docs/catalogs/silent-pneumatic-turbine-vibrators-
catalog.pdf
•http://www.durhamgeo.com/pdf/Rem-pdf/p32.pdf
•http://www.iontrap.wabash.edu/publications/ajp_80_24_rohrbach_air_cannon.pdf