The waterjet cuts with a circular jet of water, therefore any internal corner can only be cut with a small radius in the corner, as opposed to a perfectly straight edge corner. A lot of time this will not be noticeable, but once the angle reduces under 90 degrees the problem become exacerbated.
The letter ‘L’ is being cut out (the internal is waste). If un-altered, the jet would have cut the red profile (detail A). To prevent this we would alter the profile so that it stopped cutting at the position of the jet as shown.
However this does affect the cut shape. The width of the jet can also add a further problem (detail B), where the jet would overcut, in this case, the cutting profile would have to be changed to accommodate for this. For an ‘artistic’ profile these issues may not be a problem, but for a engineered profile with tight tolerances, this would have to be discussed and resolved and a revised profile agreed upon
Visit the Hydromar Ltd website for more information on 6. Sharp internal corners