The film, created as a teaching aid for students of secondary specialized educational institutions, introduces students to types of gear transmissions and methods of their manufacture.
Alternating shots of ships in port, helicopters and planes at the airport.
Cars at a gas station.
Gas meter at a gas station.
Watch assembly line.
Clock mechanism.
Metalworking machine.
The internal structure of the machine is demonstrated.
Gear transmissions are visible.
Alternating shots of different gear wheels and gears.
Wheels with internal and external engagement are demonstrated.
Different locations of the axes of rotation.
Cone-shaped wheels.
Teeth of different numbers and configurations.
Types of teeth.
A cartoon explaining gear transmissions and the basic concepts of a pair.
The concept of a multi-stage transmission.
The formula for the general gear ratio of such a transmission.
A cartoon explaining the types of tooth profiles and the effect of the driving and driven teeth on each other.
Formula for the angular velocity of the driving lever, wheel tooth.
Formula for the velocity of the contact point of the first lever.
Formula for the fundamental theorem of gearing.
The concept of external gearing.
A cartoon explaining internal gearing.
For internal engagement, the gear ratio is assigned a plus sign, for external engagement, a minus sign.
For constancy of angular relations, the pole must be immobile.
Cycloidal tooth profiles.
Cartoon explaining involute engagement.
Concept of engagement line.
Concept of engagement angle.
Concept of conjugate involute.
Gear wheels, Gear transmissions, Tooth profiles, Involute
The concept of a pitch circle.
The concept of a module.
Standardization of modules.
The formula for wheel sizes.
Wheels with the same module can be in engagement.
A cartoon explaining the concept of a module as a wheel scale.
The value of the radial clearance does not depend on the number of teeth.
When the number of teeth is equal to infinity, the wheel turns into a rack.
For wheels with different numbers of teeth, the involutes are different.
For a rack, the involutes degenerate into straight lines.
A cartoon explaining the issues of tooth contact.
The formula for the overlap coefficient.
The concept of engagement overlap.
Engagement overlap as a condition for normal operation of a gear transmission.
Engagement that is unacceptable for the operation of a gear transmission.
The geometry of flat engagement is the basis for calculating and manufacturing gear wheels.
Removing material from the depressions.
Cutting teeth by copying.
The shape of the depressions corresponds to the shape of the cutting part of the tool.
A cartoon explaining such cutting of teeth.
Manufacturing gear wheels by stamping.
Manufacturing gear wheels by rolling methods.
When rolling a hot workpiece with gears, plastic deformations of the material result in the correct shape of the depressions on wheels with any number of teeth.
On small modules, teeth on non-ferrous metal wheels are rolled without heating.
Rolling with chip removal.
When the worm cutter rotates, it engages with the rack.
The longitudinal section of the cutter corresponds to the rack, and it moves progressively.
Another type of rolling, the hob and the workpiece are in the same motion as a pair of meshing wheels.
The hob is also an involute gear wheel, but with cutting edges.
Cutting wheels with internal teeth.
The rolling method is also used in finishing operations.
Shaving.
When hardening wheels, the surface of the teeth can be distorted.
Additional finishing operations are required.
Grinding teeth after hardening is one of the varieties of the rolling method.
Repeat of frames from the film.
Gear, Module, Radial clearance, Involute, Overlap coefficient, Copying, Stamping, Running in, Shaving, Grinding