A set of products for dynamic and static experiments on geared and other drive systems.
Key features
• For studies of velocity ratios and effi ciencies of various geared systems
• Self-contained bench-mounted base unit for dynamic performance tests – including a dualpurpose simple and compound gear drive unit as standard
• Choice of optional drive units, including belt drives and a chain drive for comparative tests of diff erent drive types.
• Interlocked transparent cover for safety, while allowing students to see the drive units working
• High stability drive motor and hysteresis eff ect dynamometer brake – for a constant torque at any given speed
• Simple tools provided for quick and easy changeover of drive systems
• Optional Test Stand (TM1018a) for static effi ciency and inertia tests – including a fl ywheel as standard
• Can connect to TecQuipment’s Versatile Data Acquisition System (VDAS®)
learning outcomes
Dynamic:
• Simple and compound gear trains
• Mechanical advantage, velocity ratio and dynamic effi ciencies of gear trains
• Mechanical advantage, velocity ratio and dynamic effi ciencies of optional drive units (chain and belts)
• Appreciation of the diff erent characteristics of drive systems
• Chain and belt drive tension, including diff erent methods of application
Acceleration and Static:
• Mechanical advantage, velocity ratio and static effi ciencies of gear drives
• Mass moment of inertia of a fl ywheel by experiment and calculation
• Mass moment of inertia of geared drive systems by experiment and calculation
Description: Base Unit
A bench-mounting base unit forms the main part of this set of products. Supplied with a three-shaft gear drive unit as standard, the base unit dynamically tests the gear drive and the other optional drive units (TM1018b, c, d and e).
The dynamic tests run the input of the diff erent drive units at a given speed using a motor, while measuring the input power. At the same time, a dynamometer loads the output of the drive unit while measuring the output power. Students use the measurements to fi nd the performance and effi ciency of the drive unit.
Students may set the gear unit (supplied) as a simple or compound drive by sliding a gear in or out of mesh on the third shaft.
TecQuipment includes simple tools needed to fi t the drive units to the base unit, and to adjust the compound gear drive.
In the base unit’s upper level, the student fi ts their choice of drive unit. A variable-speed, low-voltage motor provides the shaft input turning force (eff ort) to the drive. A dynamometer provides the output braking force (load) to the drive. The dynamometer uses electromagnetic braking and a hysteresis eff ect to provide a variable load at a constant torque irrespective of the speed. Sensors on the motor and dynamometer measure their shaft speed, torque and therefore power in and out at the drive. Fans provide air cooling for both the motor and dynamometer. Flexible couplings with collets connect the drive unit to the motor and dynamometer for quick and accurate alignment.
Axial trunnions with race bearings hold the motor and the dynamometer for free rotation against their load cell sensors to measure torque accurately.
On the base unit’s lower level, controls and microprocessor controlled multiline displays adjust the motor speed and the load while showing measurements of torque, speed and power.
The base unit’s upper level includes an interlocked guard with transparent sections to prevent students touching any moving parts, while allowing them to see what is happening.
You can do tests with or without a computer connected. However, for quicker tests with easier recording of results, TecQuipment can supply the optional Versatile Data Acquisition System (VDAS®). This gives accurate real-time data capture, monitoring and display, calculation and charting of all the important readings on a computer (computer not included).
Recommended Ancillaries
• VDAS-B (bench-mounted version of the Versatile Data Acquisition System)
• TM1018a Acceleration and Static Test Stand
• TM1018b Toothed Belt Drive
• TM1018c Round Belt Drive
• TM1018d Chain Drive
• TM1018e Helical Gear Drive
Description: Optional Test Stand (TM1018a)
A separate Acceleration and Static Test Stand (TM1018a) gives extra experiments in measuring angular acceleration and static effi ciency. You may use clamps to mount the test stand temporarily on the edge of a desk, but TecQuipment recommend a more permanent fi xing to the desk or to a wall.
The test stand includes sets of weights to apply turning forces to the shaft of a fl ywheel (included as standard) or the gear drive from the TM1018. A sensor and a multiline display automatically calculate angular acceleration. Students use this to fi nd inertia by experiment.
The fl ywheel forms a simplifi ed version of one of the gears in the gear drive, to provide a starting point in understanding inertia calculations of more complex gear drives. The test stand also allows simple static effi ciency tests on the gear drive for comparison with those from dynamic tests on the base unit. A slot to the front of the test stand holds a tray (supplied) to store your weights and other loose items.
Note: The test stand and base unit do not connect to each other.
Description : Optional Drive Units (TM1018B, C, D and E)
The optional drive units work with the TM1018 base unit for dynamic tests on performance, allowing comparison with the gear drive. For extended experiments, the optional drives each include three diff erent methods of adjusting their tension to show how this aff ects performance. The three methods include:
• Distance between drive pulleys
• Fixed tension pulley
• Spring tension pulley With each drive unit, TecQuipment supplies a tension spring and a spring balance to set the tension of the tension pulley.
The shafts of all drive units run on maintenance-free, lowfriction ball races.
