Torque required to rotate a hollow cylinder containing chips

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SUMMARY

The discussion focuses on calculating the required torque, shaft diameter, and RPM for a prototype designed to remove cutting oil from metal chips during Gun Drilling. The prototype features a netted metal cylinder that rotates horizontally, powered by a motor, with 5 kg of metal chips inside. Key insights include the importance of supporting the central rod at its free end to reduce torque requirements and wear on the motor. Additionally, directing pressurized air from underneath the cylinder at an angle opposite to the rotation enhances efficiency by breaking up clumps of chips and improving drying.

PREREQUISITES
  • Understanding of torque calculations in mechanical systems
  • Familiarity with motor specifications and RPM calculations
  • Knowledge of fluid dynamics related to air flow and pressure
  • Basic principles of mechanical design for rotating systems
NEXT STEPS
  • Research torque calculation methods for rotating cylinders
  • Learn about motor selection criteria for specific RPM requirements
  • Explore fluid dynamics principles for optimizing air flow in mechanical systems
  • Investigate mechanical support designs to reduce wear on rotating shafts
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Mechanical engineers, prototype designers, and anyone involved in optimizing processes for removing cutting fluids from metal chips in manufacturing environments.

Sandeep Swarup
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I am designing a prototype to remove cutting oil from waste metal chip during Gun Drilling.
My prototype consists of a netted(meshed) metal cylinder rotating horizontally about its axis with help of shaft and a pressurised air blown from above. The metal chips will be put inside netted cylinder which will rotate with help of shaft through motor and oil wil drip down.

The only data I have is amount of metal chip that I will insert in hollow netted cylinder I.e 5kgs
How shall I proceed with calculation to find out required torque, shaft diameter,RPM
 
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Can you provide a rough drawing of the arrangement?
 
AZFIREBALL said:
Can you provide a rough drawing of the arrangement?
AZFIREBALL said:
Can you provide a rough drawing of the arrangement?
 

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PDF uploaded is the DESIGN of the prototype
 

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What does the pressurized air do again?
Quite a good blast would be needed to blow the oil off the chips if that is the intent.
 
Don’t know how much torque you’ll need, but I can tell you that the requirement will be significantly reduced by supporting the central rod at its free end. This would also reduce wear on the motor.

Also, since a lot of the resistance to rotation will come from the oily metal chips sticking together and trying to ride up the side of the mesh, having your air flow come up from underneath, at an angle opposite to the direction of rotation, will also help reduce rolling resistance, while drying the chips more quickly. It would tend to break up the clumps and expose more surface area.
 

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