Aided manufacturing software for CNC machining involves roughing and finishing solutions


Standard CNC programming

CNC CAD-Cam part programming provides utilities that enable manufacturers to bring new products to market faster and more affordable than ever before. The processing process chamber includes the use of “paths”. The trajectory shows the path of the machine that the cutting tool is in the process of machining from a block of material or stock on CNC machines. The stock can be aluminum, steel, titanium, plastic, wood and many other types depending on the application. There is a trajectory in 2D and 3D trajectories. 3D trajectory is not flat and has a 3-dimensional surface contour. An example of this can be seen in how cars are becoming more and more curvy and Aero dynamics over the last 20 years. You can see that consumer goods was taken at the “modern” look, which is not as prysmatic as it was 20 years ago. This is directly related to advances in the technology of CAD-CAM software technology and the possibility of designing 3D models in computer-aided design (CAD) and CNC machining technology (Cam).

Roughing and finishing of the trajectory

“Rough” path, generally used in the initial phase of treatment, as it allows the driver to remove large amounts of material with large end mills cutting tool. Roughing is used in CNC machining to save time and maximize cutting. At its core, the concept is to quickly remove the maximum amount of material in the shortest possible time with minimal tool wear. CAM technology provides many types of draft strategies, which are subdivided into 2D and 3D processing, as well as 4th and 5th axis trajectory. They may include:

  • Profiling

  • Pocketing

  • Engraving

  • Drilling, tapping and boring

  • Plunge Roughing

Each of these types generally will have a list of options that include the trajectories of the links, inputs and lead-outs for the tool, processing and grouping features to optimize the machine for cutting the sequence, depth of cut variables, tool speed and feed information, and much more. All of this information is translated mathamatically into a numeric code language called “G-code”. This is where “NC” Programming comes from.

“Finish” the trajectory is used after roughing to drive a tool through the remaining material and to remove what is left behind in the quest to produce a smooth almost polished surface. There are several fine trajectory in existence such as slice planar, slice spiral and slice radial type cutter paths. There is also equidistant offset contour path, which is also known as “constant scallop” or constant spike” of trajectories that are all doing the same thing. These finishing cutter paths in CAD-Cam are considered “medium” trajectory, and a straight “finishing” of the trajectory. The offset of the trajectory displacement is a powerful and highly efficient in CNC machining, as it maintains the exact cutter for the size of the tool regardless of the complexity of the surface. TIA type the path of the cutter is used with a very high pitch for a permit to produce a near polished surface for tools and dies, mold making and other 3D machining. You can usually find this level of 3D trajectory in advanced CAD-CAM products that are used in mold-making, aerospace industry, medical devices manufacturing and other industries depending on use

What is the “rest” treatment?

“Rest” machining was initially developed to come after the operation-roughing or finishing toolpath opweration and clean up the material that remained. The idea of the name came from “machine the rest” part. Typically, in CAD system, processing systems are loaded in “tree of jobs” in the software interface of a single trajectory processing time. A high level CAD-Cam combines machining operations that include a combination of strategies and even adds functionality work within the machining strategy. This concept of mixed strategy is perfect for machinists that need to reduce cycle time and become more efficient in the workflow programming. It will be rude-rude/the other combinations or finish-Finish/combination of others. Thus, the programmer Cam loads of rough work, and then the rest roughing operation in the tree Cam. Then a finishing strategy is loaded into the tree and trimmings are places to stay. Each operation is fully editable in the tree and the associative model a CAD part. This means that if a change is made in the framework of the model, all the trajectories will also be automatically updated. This is a huge time saving aspect of modern CAD-CAM technology and are highly valued.

Again, the rest of the finish allows the programmer to enter the first finishing tool diameter. The final rest finishing tool diameter is smaller, and then the program automatically knows how much material is removed in the initial stage. The program then automatically applies the trajectory for the car “rest” on the rest finishing tool diameter. It is very simple. After all paths are generated by CAM systems, the software should have built in simulation allowing the programmer to sit and simulate the trajectory and to see the material being cut. This allows the programmer to visualize the entire process, to calculate the machine cycle, catch the tool and tool holder gouges or collisions and a lot more. Modeling is very important in the process of CNC machining, as it saves the programmer from making costly mistakes that can happen.


Cam programming of machining software CNC simple.

  1. End mill (optional)

  2. Pre-drilling and drilling (optional)

  3. Roughing

  4. Rest roughing

  5. Semi-Finishing

  6. Finish

  7. Finish the rest

  8. Pencil Mill

Roughing and finishing “rest” machining part of the process in 4 and 7 is very important aspects of the Cam programming process and are available for both simple and complex CNC machining parts manufacturer. Programmers can use rersearching the treatment of residual material to implement in their production processes with CNC.

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