Gears transmit rotational movements. They adapt the torques and speeds of a consumer drive according to demand.
The MT 152 is a spur gear unit with helical gear wheels. The gear is single-stage, and has a fixed transmission ratio (fixed gear unit). It is a standalone gear unit, i.e. a self-contained transmission in its own gear case. Self-contained gear units are usually arranged between the motor and the machine, or are used as installation kits in machines. By contrast, open-running gear wheel pairs forming part of a machine are termed non-self-contained gears.
Helical gear wheels run more smoothly and quietly than spur toothed gears because the gear teeth intermesh gradually and multiple teeth are engaged. They are suitable for higher speeds, and can withstand greater loading than comparable spur toothed gears.
 
The MT 152 training unit serves as an introductory project to the field of assembly techniques. The assembly and disassembly processes can easily be completed within standard lesson times. Basic tools, all supplied with the kit, are required for assembly.
The unit is of most benefit in teaching if small groups of 2/3 students work independently. The group has a defined task to perform, with clear assignments to complete.
The comprehensive instructional material is oriented to practical needs. This includes a complete set of drawings with a general arrangement drawing, parts list and single part drawings.

- Design and function of a spur gear, with helical gear

  wheels
- Planning and presentation of the assembly process
- Assembly and disassembly, including for the

  purposes of maintenance and repair
- Reading and understanding engineering drawings
- Dimensioning exercises, gauging of parts
- Familiarisation with various machine elements:

  ball bearings, shaft seals
- Familiarisation with assembly aids and jigs
- Material selection criteria