Design of Mechanical Drives (DMD)


Syllabus for Vel tech University Students:

UNIT I Design Of MECHANICAL DRIVES For Flexible Elements              

Selection of V belts and pulleys– Selection of Flat belts and pulleys – Wire ropes and pulleys – Selection of Transmission chains and Sprockets.  Design of pulleys and sprockets.


UNIT II  Spur Gears and parallel axis Helical Gears              

Gear Terminology-Speed ratios and number of teeth-Force analysis -Tooth stresses – Dynamic effects – Fatigue strength – Factor of safety – Gear materials – Module and Face width-power rating calculations based on strength and wear considerations – Parallel axis Helical Gears – Pressure angle in the normal and transverse plane- Equivalent number of teeth-forces and stresses. Estimating the size of the helical gears.


UNIT III Bevel, Worm and Cross helical gears                

Straight bevel gear: Tooth terminology, tooth forces and stresses, equivalent number of teeth. Estimating the dimensions of pair of straight bevel gears. Worm Gear: Merits and demerits- terminology. Thermal capacity, materials-forces and stresses, efficiency, estimating the size of the worm gear pair. Cross helical: Terminology-helix angles-Estimating the size of the pair of cross helical gears.


UNIT IV Design of Gear Boxes           

Geometric progression – Standard step ratio – Ray diagram, kinematics layout -Design of sliding mesh gear box -Constant mesh gear box. – Design of multi speed gear box.


UNIT V Design of CAM, Clutches and Brakes    

Cam Design: Types-pressure angle and under cutting base circle determination-forces and surface stresses.Design of plate clutches –axial clutches-cone clutches-internal expanding rim clutches-internal and external shoe brakes.




  1. MachineDesign by R.K. Khurmi, J.K. Guptha.
  2. Prabhu, T. J., Design of Transmission Systems, Private Publication, 1999
  3. Mehtha, N. K., Machine Tool Design
  4. Shigley J., Mechanical Engineering Design, Mc Graw Hill, 2001

Reference BOOKS

  1. Juvinall R. C., Marshek K.M., “Fundamentals of Machine component Design”, – John Wiley & Sons  Third Edition,  2002.
  1. Bhandari, V.B., “Design of Machine Elements”, Tata McGraw-Hill Publishing Company Ltd., 1994.
  1. Maitra G.M., Prasad L.V., “Hand book of Mechanical Design”, II Edition, Tata McGraw-Hill, 1985.
  1. Shigley J.E and Mischke C. R., “Mechanical Engineering Design”, McGraw-Hill International Editions, 1989.
  1. Norton R.L, “Design of Machinery”, McGraw-Hill Book co, 2004.
  1. Hamrock B.J., Jacobson B., Schmid S.R., “Fundamentals of Machine Elements”, McGraw-Hill Book Co., 1999.



Design of Mechanical Drives (DMD) Study material, notes, Text book are provided in the links below download them for free………..

The below link provides you a e book (pdf book) of DMD in two parts for free download

Click to Download

Note: If you have downloaded all the books in Design of Machine Elements, then no need to download this.


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