Geometrical Tolerancing
A three day training course (to BS 8888 and ISO standards) intended for anyone who needs to understand the theory and practice of Geometrical Tolerancing (GD&T).
Aims & Objectives
Specifiers or designers will learn how to apply geometrical tolerancing in an consistent and systematic manner, ensure a specification is complete and avoid common mistakes; specification interpreters will learn how to read geometrical tolerances in a logical and systematic way, and recognise common errors and incomplete specifications.
When used correctly, the benefits of geometrical tolerancing include:
- improved productivity, reduced costs and enhanced quality
- larger tolerance zones and less ambiguous specifications
- the facility to tolerance form and relationships such as coaxiality
- uses datum structures that manufacturing and inspection can benefit from
- fewer disputes over compliance or non-compliance of components
- reduce scrap, re-work rates and fewer queries due to incomplete specifications
Outcomes
Specifiers (designers) will learn:
- how to go about developing an specification in a systematic manner
- how to ensure that a specification is complete
- how to avoid common errors that cause problems with manufacture or inspection
- how to choose datums and define datum systems correctly
- how to apply geometric tolerances in a logical and consistent manner
- how to calculate tolerance values and Virtual Condition boundaries to ensure that parts fit together
- when to take advantage of the Maximum Material Requirement
- how to recognise when a specification is incomplete or incorrect
- how to recognise common mistakes which are likely to cause problems with manufacture or inspection
- how to recognise when datums and datum systems are not correctly defined
- how to interpret geometric tolerance indications in a methodical and logical manner
- how to calculate Virtual Condition boundaries
- how to calculate bonus tolerances when interpreting the Maximum Material Requirement
Click here to download the course flyer 
Intended Audience
The course is suitable for designers, manufacturing engineers and technicians, QC and inspection staff.
Prior Knowledge
Attendees should be familiar with the conventions of engineering drawing, i.e. orthographic projection, cross sections, representations of features such as screw threads, dimensions and ± or limit tolerances.
The course goes back to first principles, so no prior knowledge of geometric tolerancing is required.
This does not mean that the course is only for beginners. Engineers and technicians who may have worked with geometrical tolerancing for many years also benefit from going back to first principles, as they have not normally been shown them before, and even engineers with 15 or 20 years experience of geometrical tolerancing often express surprise at how much they learn.
Training Team
This course is delivered by NPL Approved Training Providers around the UK.
Documentation
Attendees are provided with extensive, illustrated course notes, which will prove a useful reference text long after the course has been completed.
Attendees also have a workbook to accompany the course notes, which includes a range of exercises, questions and calculations to complete, in order to assist with understanding and retention of course material.
When the course is run in-house for a single client, some of the workbook exercises and worked examples are based on drawings or components provided by the client, in order to make the training as relevant as possible.
Further Information
Contact: Pete Moores
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