If its a porous surface, such as an oilite bush, odds are the roughness profile will be somewhat skewed which can upset the calculations in the instrument giving invalid results from simple measurements. Anything reasonably capable will have adjustments to sort this out but you do need to know what you are doing and understand what is going on. Simply trying to follow the manual painting by numbers fashion probably won't work. For simple instruments a larger stylus radii can be the factory solution. I belive this used to be the case with the old hand held Taylor Hobson instruments (late 's early 's vintage ??).NPL do a pretty good guide :-The measurement of surface texture using stylus instruments.Author(s):Leach, R KSource:Measurement Good Practice Guide No. 37Goole search should pull up a direct download, "NPL UK Guide no 37" ought to work, or you can go to the right page on the NPL site, register and download that way.NPL guides index is at Guides by number : Guides : Publications : National Physical Laboratory guide. All the ones I've used have been pretty good from the naming of names and scene setting point of view. Very handy when a more complete text drives you straight into the swamp of confusion.I had a Laser Talysurf in the lab for several years. I learned to drive it OK but franky never really felt I understood what was going on under the hood.Clive
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Smoothness Testing
Smoothness testing and surface roughness testing will help you to work out whether a surface is suitable for a particular purpose.
These important tests show the surface roughness makeup of the materials you use to build your products, which has an important role in their durability and performance.
Surface roughness testing will indicate how your steel products will interact with their destined environment and can guide your choice of paints and coatings. It can demonstrate the smoothness of any paper or board you are considering for packaging. Or if you&#;re a manufacturer of medical devices, surface roughness testing can guide the development of a hip prosthesis.
Across many industries you&#;ll find products and materials that must be manufactured within stringent surface roughness limits to ensure the optimum quality. These include ISO -01 and ASTM D Method A for steel products.
Surface roughness testing is an important inspection. It can help you obtain the visual appeal you&#;re seeking for your product by identifying surface defects, their severity and the impact on the material. All of which will support you to optimize your processes and improve the quality of your final product.
Surface roughness is quantified by the deviations in the direction of the normal vector of a real surface from its ideal form. If the deviations are large, you have a rough surface; if they are small, the surface is smooth.
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Over the years there have been many methods developed to measure surface roughness. These include: direct measurement, non-contact, and comparison methods. You can explore surface roughness with direct stylus based technology, or you can use light or sound instead for a non-contact approach.
The smooth news is that a roughness tester will quickly and accurately determine the surface texture or surface roughness of your products.
The Industrial Physics range of modern, innovative surface roughness testing machines combine robust mechanical design and user-friendly electronics. Click through some of the smooth inspection devices we offer below.
You may have heard of &#;The Bekk Method?&#; It&#;s a tried-and-tested surface roughness testing approach based around air flow. The Automatic Bekk Smoothness Tester from Messmer Büchel is a microprocessor-controlled instrument that&#;s perfect for testing very smooth surfaces like coated label papers. To find out more &#; click here. And if you&#;d like to look more into paper testing then check out our guide to paper porosity testing in the iP knowledge base here.
The TQC Sheen surface profile roughness gauge is a simple surface roughness testing instrument for fast measuring of the point peak-to-valley height of a surface. It&#;s ideal for measuring the height of welds &#; find more info here.
If you work in the marine industry and want to understand the roughness of a vessel&#;s hull then we&#;ve got the shipshape testing solution you need. The Hull Roughness Gauge will enable you to spot and solve roughness issues relating to corrosion, pitting, plate undulation or biofouling.
Another handy product from TQC Sheen is the steel surface roughness comparator. It gives you a comparison standard according to &#;ISO part one standards for preparation of steel substrates. It indicates the surface condition of blasted steel according to ISO in grades of fine, medium, and coarse.
The surface roughness comparator can be used in accordance with other international standards and comes in a sturdy leather wallet &#; find out more information here.
So, as we hope we&#;ve shown, we&#;re pretty smooth when it comes to surface roughness testing. We&#;d be happy to talk you through any of our surface roughness solutions &#; just get in touch!
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