Even small errors in the product specifications can cause faulty products which in worst case could make the product useless. Although thorough details have been specified, errors can still occur and the critical question is, who is to blame?

To ensure that designer and manufacturer make use of the same language, and keep the risk of errors to an absolute minimum, Geometrical Product Specification (GPS) is widely used.

What is GPS
Geometrical Product Specifications (GPS) is a common language for designer and supplier to catalyze the communication about a product description.

GPS is a large set of complex and interrelated documents written for and by engineers and mathematicians. In many ways you can compare GPS standards to laws, because they are laid out well to specialists.

The precise wording is useful but not always easy to understand.

Why learn the GPS language
It takes a lot of effort including first-hand experience to be fully proficient with GPS, but it is worth the effort.

Detailed specifications allow
• larger tolerance values
• easier and more efficient work flow

This will most likely add to a reduction in the production costs.

All over the world there are GPS courses at different levels, dependant on need:

Is it satisfactory for you to be able to make the drawings, or is your ambition to be able to draw them as well?

No need to consider how
GPS gives rise to a different starting point when making a product description, because you no longer need to consider the mode of production.

Your starting point should always be the function of your product. Define that, apply the geometrical product specifications to your drawing, and the manufacturer decides whether the most relevant tool is a turning lathe or a miller.

Be careful not to get lost in the detail. For some parts of the product a low tolerance is demanded – for other parts it is less important, and a wider tolerance will simplify the production procedures.

But the more precise you have defined tolerance for relevant parts of the product the easier it will be to produce. And should it happen that the outcome is useless, you can refer to the GPS. If it is done correctly, the responsibility is that of your counterpart.

The future lies with GPS
GPS enables to make specifications with a precision that no previous method of measurement has been able to achieve. EA-Connect finds GPS absolutely essential in our line of work where accuracy of product specifications makes the difference between failure and success.

Read more
Making it simple – Geometric Product Specifications, an article from ISO.

The GPS Handbook has made a handbook describing the principles of GPS: Find your way in GPS – find it here.

Examples and more links.

Source: EA-Connect
Text: Karoline Lawætz, ScienceCPH

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