Choosing the Right Circular Bowl: A Guide to EVP, EVP-A, & EVP-RA

Looking at different types of circular bowls, those with and without an unload system. The first is a plain bowl which doesn’t have an unload feature. You can put your media, compound, and components in there for the prescribed time for deburring and polishing, and at the end of the process, you will manually pick the parts out. However, if you are processing smaller components in quantity, a machine with an unload system would be best. This is the RA model, a traditional machine which is recognisable by the handle on the outside and the rise in the chamber, making it great for smaller pieces.

However, if you need to process both smaller and larger components, the A version is the most popular – particularly for subcontractors or those in more complex environments. It looks very similar to the RA model but is easily identifiable as the A version because it doesn’t have the unload handle. During the process, the long flap is pushed out of the way, running clockwise, and at the end of the process, if you’re handling smaller pieces, you reverse the machine. The flap goes down, the media drops through, and the parts are unloaded. You can also process larger components, such as three crankshafts at a time, and run the machine overnight without them catching up as long as they have the same drag factor. This machine works really well in a subcontractor environment.