6 ways to optimize the design of CNC machining parts

1. Hole depth and diameter
In most cases, the hole is interpolated with an end mill, rather than drilled. This machining method provides great flexibility in the hole size of a given tool and provides a better surface finish than a drill. It also allows us to use the same tools to machine grooves and cavities, reducing cycle time and part costs. The only downside is that due to the limited length of the end mill, holes more than six diameters deep become a challenge and may need to be machined from both sides of the part.

2. Thread size and type
Drilling and thread making go hand in hand. Many manufacturers use "tap" to cut internal threads. The tap looks like a toothed screw and "screws" into the hole previously drilled. We use a more modern method to make threads, a tool called thread milling cutter to insert the thread profile. This allows precise threads to be created, and any thread size (threads per inch) that shares that pitch can be cut with a single milling tool, saving production and installation time. Therefore, UNC and UNF threads from #2 to 1/2 inch and metric threads from M2 to M12 can be used in a single tool set.



3. Text on the part
Want to engrave the part number, description or logo on the CNC parts? Speed ​​Plus supports most of the text required for processing, provided that the spacing between individual characters and the strokes used to "write" them are at least 0.020 inches (0.5 mm). In addition, the text should be concave rather than convex. It is recommended to use a font of 20 points or larger, such as Arial, Verdana or similar sans serif fonts.

4. Wall height and characteristic width
All our tools are made of carbide tools. This super-rigid material provides maximum tool life and productivity with minimal deflection. However, even the strongest tools can be deformed, as can metals, especially processed plastics. Therefore, the wall height and feature size are very dependent on the geometry of the individual parts and the tool set used. For example, the minimum feature thickness supported for processing is 0.020 inches (0.5 mm) and the maximum feature depth is 2 inches (51 mm), but this does not mean that you can use these dimensions to design finned heat sinks.

5. Power tool lathe
In addition to extensive milling capabilities, we also provide live tool CNC turning. The tool set used on these machines is similar to the tool set on our machining center, except that we do not turn plastic parts now. This means that eccentric holes, grooves, planes and other features can be machined parallel or perpendicular (axially or radially) to the "long axis" (its Z axis) of the turned workpiece, and usually follow orthogonal parts manufactured on a machining center The same design rules. The difference here is the shape of the raw material, not the tool set itself. Turned parts such as shafts and pistons are initially round, while milled parts such as manifolds, instrument boxes, and valve covers are usually not, but square or rectangular blocks are used.


6. Multi-axis milling
Using 3-axis machining, the workpiece is clamped from the bottom of the raw material blank, while all part features are cut from up to 6 orthogonal sides. The part size is greater than 10 inches * 7 inches (254 mm * 178 mm), only the top and bottom can be processed, no side setting! However, with five-axis indexing milling, it is possible to machine from any number of non-orthogonal edges.