Once all the machining information has been applied to components the next task is to ‘nest’ them – squeezing as much components on the sheet or a move of given size as possible. A nest may contain the same parts or a mixture of different parts, and can be categorized as either rectangular or ‘free form’ (true form).
Rectangular nesting, as the name suggests nests each component as though it were a rectangle, which will result in a significant waste of material if you are cutting many irregular shapes. With rectangular nesting parts may be nested at different angles, but are usually nested at 0 and 90 degrees. Manual nesting for dissimilar components is performed by dragging and dropping parts on the nest often, known as bump nesting also.
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Unless the operator is very skilled, this technique can lead to significant material waste, and regardless is invariably a very gradual process. Because of this, many companies currently produce so called ‘static’ nests, that have been created manually and are regularly re-used. The problem with this is that all of the parts will be produced each time a particular nest is run on the machine, of if they are needed or not regardless.
Dynamic automated nesting’ on the other hand permits unique nests to be created as and when required, providing a ‘Just In Time’ approach whilst keeping high material efficiency. This of course is particularly important when processing expensive materials. Heat avoidance – when cutting thicker materials, heat can build-up when cutting more intricate areas.
Whether common collection cutting should be used between parts on the nest or a sheet ‘skeleton’ between parts will be remaining. Some systems will intelligently ‘learn’ your preferred tool placement settings as you keep up to use tooling, becoming self-sufficient quickly. At this time we’ve our nest challenging slicing information applied now; however there is certainly another important consideration that has a significant impact on the cutting time – the sequence in which these instructions are processed. Sequencing can either be an interactive or automatic process and there may be a huge difference in the sequencing efficiency between various CAM systems.
We are actually in a position to create NC code, however developers will most likely want to simulate the work to operating it on the machine prior. On a capable CAM system, simulation shall show exactly what will happen when the nest is run on the machine tool. We are satisfied with the simulation Once, a CNC program for the device can be generated.