Date: 11th, 12th, 18th & 19th February 2025
Time: 9:30am - 12:30pm
Platform: TEAMS
Tutor: Tom Reavie
Fee: BGA Member Free / Non Member £350*
Please note this training is over 4 sessions – you will need to attend all sessions to complete the course.
Gear geometry is often seen as challenging, especially for newcomers in the gear industry. Understanding geometry of gears is essential for anyone involved in gear design, manufacturing, or inspection. This comprehensive course teaches the intricate world of gears, making it easier to grasp the principles of gear geometry.
MODULES:
CYLINDRICAL GEAR GEOMETRY PART 1- HOW INVOLUTE GEARS WORK
The session will:
Remind us why we use gears.
Introduce us to the requirements of gears and the involute curve.
Show how gears work.
Show why gears need to be precise.
Explain why gears are noisy and how we make them quiet.
However, we wont look at gear design or gear calculations- that’s for later sessions.
We have Included plenty of time for questions and discussion.
CYLINDRICAL GEAR GEOMETRY PART 2- AN INTRODUCTION TO BS ISO 21771:2007
The session will:
Remind us how easy it is to specify gear geometry.
Explain why it’s more complicated in practice (spoiler alert- its due to how we make gears).
Introduce us to ISO terms and more importantly to the symbols used in ISO gear standards. ISO symbols can be considered the international language of gears.
Introduce some basic geometry calculations and diagrams from ISO 21771. We will show you how to interpret these.
Include some basic gear calculations which require a scientific calculator.
We will go through the answers at the end of the session.
We have Included plenty of time for questions and discussion.
CYLINDRICAL GEAR GEOMETRY PART 3- GEAR PAIRS AND THEIR RELATED GEAR GEOMETRY
The session will:
Remind us how gears work
Introduce gear pair geometry and lines of contact.
Introduce the concepts of working pressure angle and show you how we work out where gears start to contact on the tooth flank.
Introduce you to profile shift coefficient, ‘x’, why we use it, and what effects it has on gear geometry.
Introduce you to basic tooth thickness calculations.
Introduce the relevant geometry calculations and diagrams from ISO 21771.
Allow you to test your knowledge with quizzes but don’t worry, we will go through the answers at the end of the session.
We have Included plenty of time for questions and discussion.
CYLINDRICAL GEAR GEOMETRY PART 4- PERFORMANCE RELATED GEAR GEOMETRY.
The session will:
Show why there are performance differences between spur and helical gears
Define what is overlap ratio on helical gears and its relationship to gear noise/vibration.
Transverse contact ratio and its relationship to stress and noise.
Introduce high contact ratio gears and show why they are used.
Introduce different types micro geometry corrections.
Introduce the relevant geometry calculations and diagrams from ISO 21771.
Allow you to test your knowledge with quizzes but don’t worry, we will go through the answers at the end of the session.
We have Included plenty of time for questions and discussion.
If you are not a BGA Member please click here to see our Membership Benefits and get in touch to find out how to join.
If you would like to register for any of our essential gear training offline please contact Kirsty in the BGA office admin@bga.org.uk
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