Dry friction (TM210)

fundamentals of mechanical friction

CodeTM210

Description:

  • Friction is a key factor in mechanical engineering.
  • Static friction needs to be adequate to fix components to each other, such as parking brakes, self-locking threads and frictionally engaged connections.
  • Dynamic friction needs to be kept as low as possible, such as on bearings, in guideways or in shaping tools.
  • Consequently, great attention is paid to the topic in engineering mechanics, and understanding of it is enhanced by clearly laid-out experiments.
  • TM 210provides a broad range of experiments relating to static and dynamic friction between solid bodies which are in contact with each other and moving relative to each other.
  • Various influences on friction can be investigated, such as surface properties and material pairing.
  • A friction plate slides beneath the stationary friction body.
  • The friction plate is held in a carriage which is drawn along by a motor at uniform velocity by a motor.
  • The friction body is connected to a height-adjustable force measuring unit.
  • This ensures that the lines of action of friction force and tensile force are parallel.
  • The force measuring unit is essentially a force gauge which is fitted with an air damper to compensate as far as possible for slip/stick effects and so indicate a mean friction force (with no spiking).
  • Three friction plates and two friction bodies are available.
  • The normal force can be varied by adding weights.
  • Experiments can be performed at two constant velocities.
  • The air damping is adjustable.
  • When it is inactive, slip/stick effects can also be observed.
  • All parts are clearly laid out and well protected on a storage system.

Technical Details:

Specification:

  1. mechanical friction between 2 solid bodies
  2. friction body stationary, friction plate in a moving carriage
  3. 2 friction bodies each with 2 different surfaces
  4. 3 friction plates with a total of 4 different surfaces
  5. carriage driven by cable pulley and motor
  6. 2 driving velocities via a graduated cable drum
  7. force measuring unit: force gauge and adjustable air damper
  8. force measuring unit height-adjustable
  9. lines of action of friction force and tensile force always parallel
  10. adjustable air damper – with damping: measurement of a mean friction force adjusted by disturbances, without damping: slip/stick effects measurable
  11. storage system to house all parts

Technical Data:

Friction plate:

  • L x W x H: approx. 175x80x6mm
  • aluminium
  • PVC / felt
  • glass

Friction body:

  • L x W: approx. 50x40mm
  • dead-weight force: approx. 1N
  • smooth / rough (Al), h=20mm
  • brass / felt, h=5mm

Drive:

  • synchronous motor
  • speed: 100min-1
  • driving velocities: 23,5cm/min, 47cm/min
  • Weights: 8x 0,5N

Measuring ranges:

  • force: 0…2N, graduation: 0,05N
  • 230V, 50Hz, 1 phase
  • 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
  • UL/CSA optional

Dimensions & Weight:

  • L x W x H: 720x480x178mm (storage system)
  • Weight: approx. 10kg (storage system)
  • Weight: approx. 7kg (experimental unit)

Learning Objectives/Experiments:

  • difference between static and dynamic friction
  • friction forces as a function of
  • normal force
  • sliding velocity (relative velocities of the friction partners)
  • material pairing
  • surface properties of the friction partners
  • size of contact area
  • slip/stick effect
  • determination of friction coefficients

Scope of Delivery:

  • 1 experimental unit
  • 1 set of weights
  • 2 friction bodies
  • 3 friction plates
  • 1 storage system with foam inlay
  • 1 set of instructional material

Features:

  • fundamentals of mechanical friction
  • stationary friction body, uniformly moving friction plate
  • force gauge with air damping cylinder

Accessories:

·         Optional: WP 300.09 Laboratory trolley

 

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