# Geometric Tolerancing

## by Leicester College- Technology & Engineering Centre

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Geometric tolerancing is a method which is widely used in industry when the more basic systems of tolerancing component features does not provide the required accuracy. ...

Geometric tolerancing is a method which is widely used in industry when the more basic systems of tolerancing component features does not provide the required accuracy.

The system of geometric tolerancing id detailed together with the particular features of the system.

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## Geometric TolerancingPresentation Transcript

• Geometric Tolerancing
Design for Manufacture
Geometric tolerancing
Agreed by ISO 1001 included in BS308
(drawing standard)
Author: Leicester College
Date created:
Date revised: 2009
Abstract:
Geometric tolerancing is a method which is widely used in industry when the more basic systems of tolerancing component features does not provide the required accuracy.
The system of geometric tolerancing id detailed together with the particular features of the system.
• These files support the Edexcel HN unit – Design for Manufacture (NQF L4)
For further information regarding unit outcomes go to Edexcel.org.uk/ HN/ Engineering / Specifications
Geometric Tolerancing
• Geometric Tolerancing
Purpose –
• Geometric tolerance symbols give precise indication of GEOMETRIC requirement for a given feature / drawing
• Symbols universally understood
• Used when normal dimensioning and tolerancing are not sufficient for requirements of component / operation
• Geometric Tolerancing
• Only use geometric tolerancing if it is absolutely necessary to the required design function
• It adds to the cost of both manufacture and inspection
• Geometric Tolerancing
The symbols used represent a range of potential geometric features of a form of feature
Four types
• Form
• Orientation
• Location
• Runout
• Geometric Tolerancing
Symbol construction
• Geometric Tolerancing
Tolerance frame
This type of frame used when no datum is required
This type of frame used when a datum is specified – mandatory for some geometric features
• Geometric Tolerancing
DATUMS
• A datum may be a plane surface or axis. For practical purposes the plane surface or axis is used for manufacture or inspection
• If the toleranced feature is related to a datum, this is shown by a datum letter which is indicated in the tolerance frame by a capital letter
• Geometric Tolerancing
This resource was created Leicester College and released as an open educational resource through the Open Engineering Resources project of the Higher Education Academy Engineering Subject Centre. The Open Engineering Resources project was funded by HEFCE and part of the JISC/HE Academy UKOER programme.