Kinematic model: crank slider (KI 120)

Kinematic model: crank slider (KI 120)

representation of a purely harmonic reciprocating motion



  • The crank slider, unlike a normal crank mechanism, generates a purely harmonic stroke movement.
  • The KI 120unit can be used to generate and study purely harmonic stroke movements.
  • The experimental unit comprises a rotating crank disk, connecting rod and fixed cylinder.
  • The connecting rod is connected to the crank disk on one side via a crank.
  • Changing the position of the crank on the crank disk adjusts the crank radius in three positions.
  • At the other end, the connecting rod is connected to the fixed cylinder.
  • This end models the piston.
  • The angle is adjusted using the crank disk, and an angle scale is integrated into the base plate.
  • A millimetre-precise steel ruler is attached to the cylinder to measure the stroke.
  • The elements are mounted on a base plate.
  • Two handles make it easy to carry and stack the unit.

Technical Details:


  • investigation of a crank slider
  • generation and investigation of purely harmonic stroke movements
  • adjustment of the crank radius at three positions of the connecting rod on the crank disk
  • adjustment of the angle by turning the crank disk
  • measure the stroke on the cylinder

Technical Data:

  • Crank disk
    • anodised aluminium
    • ball-bearing mounted
  • Crank radius
    • 25mm
    • 37,5mm
    • 50mm
  • Connecting rod
    • anodised aluminium
  • Cylinder
    • stroke 0…100mm

Dimensions & Weight:

  • L x W x H: 380x280x100mm
  • Weight: approx. 3kg

Learning Objections/Experiments:

  • conversion of a uniform rotary motion into a purely harmonic reciprocating motion
  • influence of crank length and input angle on the output stroke
  • recording the transmission function of a crank slider

Scope of Delivery:

  • 1 kinematic model
  • 1 set of instructional material


Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.