You will be asked for a work offset –– this is a reference point in the CNC machine, which is defined on the CNC controller and given a name (G54, G55, etc.). Each setup can have its own work offset in Prism. We’ll go with the default of G54 for now. If your machine has Heidenhain as controller, delete G54 and set any number preferable.
The part to be machined appears on the screen as a 3D model. Below the model, there is a panel where the stock shape is defined. Pull up the panel by dragging the marker on its edge.
Shape of the stock can be chosen as cuboid or cylindrical. Set the size of the stock.
Tap a value to change it to fit the dimensions of your workpiece. The initial values represent the bounding box of the 3D model. If your stock pieces vary in size, it’s recommended to use the largest size to avoid tool collisions. By default, the part is centered inside the stock, but you have the option to place it anywhere using the alignment and offset parameters.
Select the side to be machined (the top surface) in the first setup by tapping it. Note that you might need to rotate the view to access it.
The next step is to specify where and how the workpiece is mounted on the table of the CNC machine: which point on the workpiece corresponds to the zero point, and how the workpiece is rotated.
Prism assumes that the zero point will always be one of the corner points of the stock or workpiece. Switch to the zero point view and select one of the points.
The miniature axes at the zero-point represent the machine coordinate system. Tap the corner point until it matches how the workpiece will be mounted on the table.
Finally, tap “Start programming” to move on to the next step.
Tip: To manipulate the 3D view: drag with a single finger to rotate; pinch with two
fingers to zoom; drag with two fingers to pan.