fundamentals of mechanical friction

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.