Engineering Mechanics and machi
Showing 25–36 of 38 results
-
Engineering Mechanics and machiThread Efficiency Testing Equipment
This benchtop unit is based on the vertical combination of a threaded spindle and a nut. It contains two spindles with trapezoid threads and varying lead. To match these spindles, three long nuts made of different materials with single lead, and a cast iron nut with a double lead are provided. A spring balance with a nylon cord enables a turning moment to be exercised on the spindle using a pulley. Additional weights can be placed on the rotating plate to change the axial load on the thread. The thread efficiency can be determined and compared using the measured values. The unit is portable and is equipped with anti-slip feet to ensure that it remains stable. The painted metal base plate is fitted with clips for the individual parts.
-
Engineering Mechanics and machi
Torsion Tester 30 Nm
Using this unit, metal test bars are twisted to destruction. The test moment and the angle of twist are recorded during this process. Test bars made of different materials with varying lengths are included. The test moment is applied manually using a hand wheel and a worm drive. Measurement is performed with a strain gauge torsion shaft, the deformation of which is compensated. The measurement can be read off directly in Nm on a digital display on the measuring amplifier. For adaption to different length specimens, the measurement jig can be slid along the stiff frame. Using a calibration unit at the start of the experiment, it is possible to generate a defined torque. The angle of twist is determined using a graduated scale and and a revolutions counter. Commercially available 1/2″ square drive sockets, 17mm across flats, are used as specimen holders.
-
Engineering Mechanics and machi
Torsion Testing Machine 200 Nm Motor Driven
The unit is used for torsional testing of different materials to fracture. Test moment and angle of twist are measured. Bars of different length and diameter are used as specimens. The moment is applied using a reduction geared motor that provides four different drive speeds via the frequency converter. A strain gauge measuring shaft provides the moment as an electrical signal, the angle of twist is recorded by an optoelectronic angular encoder. Both values are displayed on a LC display. The moment is transmitted to the test bars using commercially available hex sockets. For adaptation to different length probes, the dolly can be slid. The base plate is reinforced against twisting with square sections. A transparent plastic cover provides protection against flying debris on fracture.
-
Engineering Mechanics and machi
Torsional Vibration Apparatus
The model enables rotary vibration on torsion bars to be investigated. The model consists of a wall mounted base frame made of aluminium. The carrier plate has a strong chuck with the aid of which the torsion bars can be clamped in position. In the same way the mass disc and the mass ring are clamped to the torsion bar using a chuck. The effective length is easy to adjust.
-
Engineering Mechanics and machi
Transmitted Light Polariscope
Using this transmitted light polariscope, photoelastic experiments can be performed. This process exploits the fact that the refractive index of photoelastically sensitive materials changes under mechanical stress. Transmitted polarised light experiences a rotation of its plane of polarisation, this results in lines in the material subject to the same stress being of the same colour. The distribution of the stress in the model can thus be clearly seen. The polariscope can either generate coloured stress diagrams using white light or, using monochromatic light, light-dark diagrams. The filters, which have angular scales, can be rotated in a holder mounted on rollers. On the side is a pointer using which the angular position can be read off. Light sources, polarisation filters and load frames are separate components on this unit. Thus it is possible to realise flexible experimental set-ups also with own models.
-
Engineering Mechanics and machi
Tribology Trainer Basic Module
The trainer enables different sliding and rolling friction cases to be investigated. The parameters of a tribological system can be assessed during this process. The drive module is the basis for experiments with a range of accessories. The unit consists of a sturdy frame made of anodised aluminium section. Rubber feet ensure that the table unit does not slip. The individual accessory modules are driven using a DC drive motor. The motor is connected to the controller. The rotational speed can be continuously and finely adjusted using a 10-turn potentiometer. The speed is regulated electronically and displayed digitally. Friction forces are measured using strain gauge transducers. The controller processes this data and displays it digitally. Snap-action fasteners for fixing the accessory modules to the frame simplify the rapid assembly and disassembly of the experiments.
-
Engineering Mechanics and machi
Two Stage Epicyclic Gear Apparatus
Consists of 2 identical epicyclic gear stages with 3 planet wheels each. They are coupled in a way that the ring gear of the first stage is connected to the planet carrier of the second stage. Up to 4 different transmission ratios can be realised by blocking single wheels. The gears are driven using a cable drum and a variable set of weights that are lifted using a removable crank. Unwinding is prevented by a detent pawl. To determine effective torque, the deflection of a bending beam is used to measure forces. The speeds of the stages are measured by inductive sensors and can be recorded as speed-time diagram using a chart recorder. Effective moments of inertia are determined via angular acceleration. A transparent safety cover prevents unintentional contact with rotating parts.
-
Engineering Mechanics and machi
Universal Drive Unit
This universal unit is used to provide drive to experiments. It can be used to advantage wherever the simultaneous measurement of rotational speed, torque and power is required, e.g., on pump test stands, gearbox test stands, or fan test stands. The unit has a speed regulated DC motor for clockwise and anticlockwise rotation, this is set up as a floating machine. A spring balance facilitates the measurement of torque. The control unit contains thyristors for switching the motor and has a digital speed display. The unit is designed as a table unit in respect of its size.
-
Engineering Mechanics and machi
Universal Material Tester
This material tester is a benchtop unit for training purposes. Simple operation and robust construction make the unit suitable for student experiments. The test spectrum for the basis unit covers tensile tests, and also Brinell hardness testing. Using the accessories that are also available, additional bending, shear, cupping and compressive tests can be performed. PC data acquisition and evaluation is also possible. The basic version of the unit does not require any additional sources of power. The test load is generated using a hand operated hydraulic system. The test load is displayed using a large gauge and a trailing pointer. The elongation of the test specimen is recorded via a mechanical gauge. The unit features a clear layout and the rapid changing of accessories.
-
Engineering Mechanics and machi
Universal Testing Frame 400kN
This testing frame is primarily used for loading experiments on components from steelwork and civil engineering. It is specially designed for large components in 1:1 scale. The design with its double frame and intermediate space permits specimens longer than the size of the frame opening to be investigated. It this way the possible uses of the testing frame are almost unlimited. The frame components are manufactured from U section St52. The corners of the frame are formed by joints rigid to bending, each is fastened together with 9 high-strength bolts. The testing frame is delivered in pre-assembled modules; it is assembled on site and placed on four adjustable, vibration damping bearings. The hydraulic ram systems available as accessories are on rollers and can be positioned as required within the frame.
-
Engineering Mechanics and machi
Vibration of Spiral Spring Apparatus
A spiral spring made of cold rolled steel is clamped between a ball bearing mounted shaft and a fixed bracket. Two levers are fitted to the shaft diametrically opposite each other. Two sliding weights of metal on the levers can be securely fixed in position using clamping screws. These form the rotating mass with an adjustable moment of inertia. The system is displaced by hand. The angle of rotation is read off on a 1° scale disc that is also attached to the shaft. The unit is intended for wall mounting.
-
Engineering Mechanics and machi
Wheel and Differential Axle Apparatus
The model demonstrates the conditions of equilibrium on a differential pulley block. Three anodised aluminium pulleys of different diameter are fitted to a shaft mounted on ball bearings. The forces act, on the one hand, directly on the peripheral of the largest pulley, on the other hand, via a roller on two smaller pulleys. Easy to interchange weights permit the load to be varied such that equilibrium is obtained. The model is intended for wall mounting.