CAD/CAM systems

• During the manufacturing process, production engineers will use the models and CAD drawings that have been produced by the draughtsperson. For this to work correctly, the CAD technician will be required to follow strict protocols when producing the models so that all the data required is set to the same layer
• 3D CAD models must also be drawn to middle tolerance; there must be a clean shape without additional features such as text or borders. This model will be used by the production engineer to convert the model into the required tool paths for the specific machine that will be used
• The model that is produced during the design process is used for the purpose of producing the CNC program to save on time and the reproduction of work.
• By producing the original model to mid tolerance, the production department can ensure that the finished model will be produced at the desired size.
• This is a Basic symbol for Surface Texture

  
• This is a symbol for Removal of materials required

  
• This is a symbol for Removal of materials not permitted

  
• This is a completed symbol for surface texture

  
• This is the Complete Symbol for Material will be removed

  
• This is the Complete Symbol for Material will not be removed

  
• When the same surface texture is required on all surfaces around the workpiece outline, a circle will be added to the complete graphical symbol, for example;

  
• a and b - surface texture requirements

  c - manufacturing methods

  d - surface lay and orientation

  e - machining allowance

  
• Datum Feature Indicator

  
• Datum Feature Letter

  
• Single datum target frame

  
• Moveable Datum Target Frame

  
• Datum Target Point

  
• Closed Datum Target Line

  
• Non-closed Datum Target Line

  
• Datum Target Area

  
• Centre of Gravity mark shows the exact location of the centre of gravity on an object or assembly
• This is a centre of gravity symbol

  
• This symbols refers to all surfaces being finished in the same way