Two-stage worm gearbox with upper worm of the first stage

Coursework on DM (machine parts). Chain conveyor drive. The gearbox is a two-stage worm with an upper worm of the first stage.

In the course work done: 

1. Motor selection and kinematic drive calculation
2. Calculation of worm gear (high-speed stage)
3. Calculation of worm gear (slow-moving stage)
4. Preliminary shaft calculation and bearing selection
5. Gearbox housing design
6. Calculation of key connections for crumpling
7. Check calculation of shafts
8. Test calculation of rolling bearings for a given resource
9. Selection and verification calculation of couplings
10. Choice of lubricants