The pneumatic grinding is a metal grinding machine tool designed to cut/grind metal by applying pneumatic pressure. The machine is exclusively intended for mass production and they represent the fastent and more efficient way to cut a metal. The slow speed operation is occurs in a grinding operation. This machine is a multipurpose machine. 


Since pneumatic circuit plays a vital role in this device, it is very necessary to explain the working of this circuit. 
automatic pneumatic grinding machine
automatic pneumatic grinding machine

Initially starting with air compresses, its function is to compress air from a low inlet pressure (usually atmospheric) to a higher pressure level. This is an accomplished by reducing the volume of the air. 
Air compressors are generally positive displacement units and are either of the reciprocating piston type or the rotary screw or rotary vane types. The air compressor used here is a typically small sized, two-stage compressor unit. It also consists of a compressed air tank, electric rotor and pulley drive, pressure controls and instruments for quick hook up and use. The compressor is driver by a 10HP motor and designed to operate in 145 – 175 PSI range. If the pressure exceeds the designed pressure of the receiver a release value provided releases the excesses air and thus stays a head of any hazards to take place. 
The stored air from compressor is passed through an air fitter where the compressed air is filtered from the fine dust particles. However, before the suction of air into compressor a filter process take place, but not sufficient to operate in the circuit here the filter is used. Then having a pressure regulator where the desired pressure to the operated is set. Here a variable pressure regulator is adopted. Through a variety of direction control value are available, a hand operated solenoid Valve with control unit is applied. The solenoid valve used here is 5 ports, 3 positions. There are two exhaust ports, two outlet ports and one inlet port. In two extreme positions only the directions can be changed while the Centro ore is a neutral position and no physical changes are incurred.The 2 outlet ports are connected to an actuator (Cylinder). The pneumatic activates is a double acting, single rod cylinder. The cylinder output is coupled to further purpose. The piston end has an air horning effect to prevent sudden thrust at extreme ends. 


  • The compressed air from the compressor reaches the solenoid valve. The solenoid valve changes the direction of flow according to the signals from the timing device. 
  • The compressed air pass through the solenoid valve and it is admitted into the front end of the cylinder block. The air pushes the piston for the grinding stroke. At the end of the grinding stroke air from the solenoid valve reaches the rear end of the cylinder block. The pressure remains the same but the area is less due to the presence of piston rod. This exerts greater pressure on the piston, pushing it at a faster rate thus enabling faster return stroke. 
  • The weight attached at the end of the hacksaw frame gives constant loads which lower the hacksaw to enable continuous grinding of the work. 
  • The stroke length of the piston can be changed by making suitable adjustment in the timer. 
  • Grinding hacksaw frame is removed in the case of grinding operation. The above same procedure is occurring in the grinding operation.


  1. Mining 
  2. Chemical Industry 
  3. Plastics and rubber industries 
  4. Stone, Ceramic and glass industries 
  5. Metal Industries:
  6. Iron and Steel
  7. Non-ferrous metals
  8. Foundries
  9. Scrap and recycled metals
  10. Leather Industry 
  11. Textile Industry 
  12. Paper and Printing Industry 
  13. Grinding Industries


  1. There is no need of giving feed during every cut due to the presence of weight.
  2. The grinding/grinding speed can be varied according to our needs by adjusting the timer.
  3. It is portable
  4. It does not have any Prime mover, like electric motor related to the unit.
  5. As the air is freely available, we can utilize the air to cut the metal and hence it is economical.
  6. Simple in construction than mechanical hacksaw and grinder
  7. It is a compact one
  8. Less Maintenance


  • Only smaller size and soft metal can be cut
  • It is costlier than the mechanical hacksaw because of compressor unit.
  • Less efficiency when compressed to mechanical device.
  • Leakage of air affects the working of the unit.

More Resources /articles
Pneumatic or Air operated projects
Cutting , Hacksaw Machine Projects
New Mechanical Projects 2020 ( All Projects Post Index List )

Sachin Thorat

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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