Hello and welcome to this blog post on tolerance and roughness charts for different polymer processing techniques. This post supports you in the polymer shaping selection as part of the material selection process.
1. Tolerance chart:
A part will not be exactly shaped to a specified dimension. There will be a deviation Δx from a desired dimension x which is allowed by the specifier. This is in general referred to as tolerance T which is defined as e.g. x =100 ± 0.1mm, or as 0.01. The bar chart allows selecting different polymer processing techniques to achieve a desired tolerance.
2. Roughness chart: A part will have different surface roughness R, which is measured by the root-mean square amplitude of the irregularities on the surface. A rough surface will have an R < 100 μm and a high polished surface has a R < 0.01 μm. The bar chart allows selecting different polymer processing techniques to achieve a desired surface roughness.
Thanks for reading!
Greetings and till next time,
Herwig Juster
New to my Find Out About Plastics Blog – check out the start here section.
Literature:
[1] Granta - Material and Process Selection Charts, 2010
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