Over time the polyurethane tub and spinner will wear. This will happen more quickly with highly abrasive process media and with sharper / heavier components and very slowly with polishing processes (providing the correct ratios of parts-to-media are adhered to).
Occasionally machines are disconnected and wired back in (following relocation, repair, etc…). When this happens machines can have the electrical phases reversed and can run backwards. Whilst the machine will process you will find the result isn’t as good as it should be.
When your process is first established a full load of parts should be calculated (be it 5,500 or even 5,000). This number of parts will be equivalent to a volume which then be added to the media to fill the machine to the correct level ensuring that all operates as it should.
The seal gap between the moving spinner and stationary tub (bowl) allows the process water, particles and any contaminants to be carried out of the bowl so the process can operate and perform to its optimum capability consistently.
Water and compound are added into the machine to facilitate the cutting process and remove any debris coming from the media, parts and any additives so the process stays clean, the media can keep cutting and doing its work as it should do and to protect the parts being processed (i.e. with a rust inhibitor if corrosive).
Abrasive media (for deburring, radiusing, blending machining marks, etc…) needs to have an ‘open face’ to work as it should. This is where you can feel the abrasive particles when dragging your finger nail over the surface of the media (like a file). When media becomes ‘clogged’ due to insufficient levels of compound being added to the process bowl, poor draining, poor quality media, etc… it becomes smooth (and even shiny in extreme cases). Often times users can think this to be a benefit as ‘it lasts forever’. In truth though it just has stopped cutting and not only does it last forever, so do your process times! If your media is smooth and your finish or process times are adversely affected it is time to throw it away and refill the machine with new media.
For more information on Centrifugal Disc Finishing please visit www.rosler.com
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As most media (ceramic and/or plastic) wear, the level in your machine can drop significantly over time. As mass finishing processes work by covering the part with the media and the media moving over the edges to create the deburring, radiusing, etc… it is important a ratio of media : parts is retained.
Wet or Vapour blasting is a mechanical method of cleaning and preparing a surface. It employs a water/ media mix, a pump together with added pressurised air. The process is widely used for a range of applications from general cleaning through to highly technical and accepted standards for industries including; aerospace, nuclear, the food industry, medical, pharmaceutical, oil and gas, utilities, powertrain, motorsport and automotive. The process is a very economical, versatile and efficient cleaning and finishing process and is used in a wide range of both general and specialised surface preparation work.
To understand what wet or vapour blasting is and where you would use it please see our blog: Wet / Vapour Blasting – What Is It And Why Should You Consider Using It?
Mass finishing/vibratory machines are some of the easiest machine tools to use.
As a result sometimes operators can get in to the habit of just turning them on each day and ignoring simple operating and maintenance rules. Here are 9 mistakes people make which you can avoid to help you get the most from your equipment: