![]() ![]() ![]() #4 Apply a radius to internal edges and corners Where you have a specific need for a tight tolerance on a CNC machined part, apply it only to that dimension – and maintain a consistent tolerancing method across the remainder of the CAD design to save time and cost. CNC machines vary in their standard tolerances and if you apply none to your model then the machine will default to its standard tolerance. For example, a hole with a tight tolerance applied will require a boring tool or a reamer rather than a standard drill bit. Tight tolerances increase CNC machining time and therefore cost. #3 Consider manufacturing tolerances carefully Keep wall thicknesses within your design above 0.8mm for metals and 1.5mm for plastics to avoid manufacturing process issues. Thin walls can reduce the stiffness of the component and therefore create vibrations during the CNC machining process, lowering the surface finish quality and reducing accuracy. #2 Keep walls of CNC machined parts to a minimum machining width If you limit the depth of your cavity to 4 times the width, your design will be machinable, therefore if the cavity of your CNC machined part is 20mm wide, you should limit the depth to no more than 80mm. To give you the best chance of ensuring your design is both cost-effective and suitable for CNC machining, we’ve put together the following tips for improving your CAD design ready for manufacture: #1 Design cavities with a suitable width to depth ratioĮnd CNC milling tools are limited in the length that they can cut, usually restricted to around 3-4 times their diameter. ![]() The MTA report also shows that there is little data available on the use of manufacturing technology such as CAD software systems, so it is difficult to say how many of us are now designing and engineering our own components for manufacture, but our experience at Geomiq is that more of our customers than ever are designing and developing their CNC machined parts in house, and the more we can do to help in getting those products right first time, the happier we – and you – will be. According to a report by The Manufacturing Technologies Association (MTA), the turnover for the manufacturing technology sector in the UK in 2018 was around £2.5 billion, with a large proportion of those manufactured goods set for export. The global CNC machine market is expected to reach $115 billion USD by 2026, giving an idea of just how popular this manufacturing method is. Getting your CAD right will save you time in bringing your products to market whilst helping to avoid the cycle of revision and re-work that can become a problem when your model isn’t optimised for the manufacturing process selected CNC machines are extremely versatile, but every tool has its limitations. In today’s world, parts delivered right first time might mean a competitive edge over competitors, meeting delivery targets or hitting budget, and therefore it is more important than ever that the design used for production is not only suitable for CNC machining, but is also critical to ensuring the most cost-effective, accurate manufacturing processes are used. The development of CNC machining has a fascinating history, with the earliest CNC machine tool developed in the 19670s, using code to control the movement of the production equipment. CNC machining is an efficient, cost-effective way to have metal or plastic parts produced that require cutting or drilling, and this manufacturing technology is made an even more attractive for engineers by the fact that they can be manufactured to your own design direct from CAD software. ![]()
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